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 مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma

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عدد المساهمات : 542
تاريخ التسجيل : 16/06/2010

مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 1:43 pm

Kinescope




CRT - Evacuated glass envelope,
which produces the image on the phosphor coated
screen using a beam from the electron gun. Ray -
a stream of electrons emitted from the gun when
heater is hot enough, something would
release of electrons from the cathode, which then
collected in a thin electron beam with
focusing element.
Phosphorus - a chemical element that emits
light when excited by electron beam.
Deflecting the beam, we can get a line to the screen.
Modulating the beam intensity, we can
get the picture.
CRT consists of a bulb, an electron gun
Screen covered thousands of phosphorous dots
deflection system and other auxiliary
components.
1. Glass bulb


The front and side walls of the bulb and thick
strong, to withstand the difference
pressure (10E-6 10E-7 mm. Rt. Cm.) Moreover Front
the screen surface is further
processing.
Conductive graphite coating is applied to
inner and outer surface of the bulb, creating a
thus two plate filter
high-voltage capacitor from 500 do1500
pF. Glass bulb is an insulator.
Typically, the ratio of length and width of the screen 3: 4,
monitor is characterized by long diagonal screen
and the angle of the beam.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
2. Electron gun


Electron gun - the component that
emits electrons from the cathode surface. Gun
consists of a heater, cathode, modulator G1
(Controls the intensity of the electron beam)
accelerating electrode G2, focusing
electrodes G3, (G4) and high
cylindrical electrode G5, which imparts a ray
extra energy before reaching it at
phosphor layer.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
3. Phosphor layer


This is a homogeneous coating the inside front
surface of the CRT phosphor containing
materials with additions of ZnS, CdS, Ag in some
proportions. This layer is covered with a thin aluminum
film, transparent for electrons. Anode
voltage above 20 KV is applied to the coating at
monitor is working.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
4. Deflection system


Consists of horizontal and vertical
deflection coils, specially
winding, to create a uniform magnetic
field, providing an undistorted image.
Deviation proportional to the intensity
magnetic field, which in turn
proportional to the current flowing in the coils.
In other words, the deviation is proportional
deflection current and the square of the anode
voltage.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
The force acting on an electron, with an increase
anode voltage increases, the rate of its
increases and the deflection decreases.
The main symptom of lowering the anode
stress - increase image size and
defocusing.
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مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 1:45 pm

TV processor TDA8362



The existence of two interchangeable versions of this popular chips,
each of which is available in several models, raises many questions for
her replacement. This article contains information about the structure
and work of chips, as well as valuable information on the specifics of
some of its modifications.

KEY FEATURES
Chip TV processor TDA8362 contains a chain of signal processing of
intermediate frequency (IF), multi-standard demodulator
frequency-modulated signal sounds, automatically adjustable notch and
bandpass filters in the channel of video signal processing, delay line
luminance signal, chrominance signal decoder for PAL and NTSC with
automatic detection system, switch inputs TV / AV, circuit switching
RGB-signal synchronization circuit and personnel line-scans.
Option TDA8362A contains, togo, auto white balance circuit. Thus,
TDA8362 includes all major slabosignalnye chain needed to build a color
television receiver.
The minimum number of elements that are connected to external
circuits, and only one element, which requires setting (reference path
demodulator IF signal), creates an exceptional ease of use TDA8362. As a
result, the processor TDA8362 has become one of the most widely used
circuits in modern television technology.
The main characteristics of the TDA8362 are shown in Table. 1.
ParameterValue
Supply voltage, V8 ± 0,8
Supply current, mA80
Power consumption, W0,7
Sensitivity UPCHI, uV70
UPCHZ sensitivity, mV1
Stereo signal from the external input, mVeff350
The video signal from the external input, Vp_p1
Input signals in RGB, Bn n0,7
Demodulated PTSTS, Vp-p2,4
Current management of AGC tuner mA0...5
APCHG range of voltage, V6
Audio output (vyv.50), mV700
Output signals in RGB, Bn_n4
Output current line scan, mA10
Output current of the field sweep, mA1
Range of voltage control, V0...5


Table 1. The main characteristics of the processor TDA8362
Building, pinout and basic parameters of all modifications chip
TDA8362 (except version TDA8362A) coincide. Features of their
application will be discussed below.

DESCRIPTION OF STRUCTURAL PATTERNS
Block diagram of TDA8362 chip is shown in Fig. 1.

Fig. 1. The block diagram of a processor TDA8362
In Table 2, we pin assignment TDA8362, and also shows the difference in pinout options TDA8362 and TDA8362A.
The latter contains a scheme of automatic white balance, measuring
signal to the input of which comes from the output 14 TDA8362.
TDA8362TDA8362AOutput destination
11De-emphasis signal sounds and switching to a positive modulation
22The reference circuit demodulator IF signal
33The reference circuit demodulator IF signal
44Output of the circuit identification video, audio input switch
55IF input signal and sound volume control
66Input audio signal from the external connectors
77Exit PTSTS
88Decoupling capacitor circuits digital supply
941Earth 1 (general)
1010Power Input
1111Earth 2 (general)
1212Decoupling capacitor circuit filter settings
1313Log in internal video
1414Log in adjusting the rf correction scheme (definition)
1515External Video Input
1616Chroma in
1717Brightness control
1818Exit In
1919Output G
2020Output R
2121Switch output RGB-signals and blanking
2222Output signal R (from external sources)
2323Output signal G (from external sources)
2424Output signal V (with external sources)
2525Contrast Adjustment
2626Adjusting Saturation
2727Adjust the hue (or color out)
2828Log in SDLC BY (with a delay line)
2929Log in SDLC RY (with a delay line)
3030Output CRC RY (the delay line)
3131Output CRC BY (the delay line)
3232Output reference signal at 4.43 MHz TDA8395
3333Filter phase detector
3434The conclusion of accession quartz resonator 3.58 MHz
3535The conclusion of accession quartz resonator 4.43 MHz
3636Output power for the MO line scan
3737Output pulse start line scan
3838Pulse input flyback line scanning / output gating pulses (SSC)
3939Filter the phase detector 2
4040Filter the phase detector 1
4142Log in pulse reverse field sweep
4243The conclusion of accession RC-circuit MO Vertical
4344Output trigger pulse field sweep
449Output circuits AFC
4545IF signal input 1
4646Input 2 IF signal
4747AGC circuit output
4848The conclusion of accession decoupling capacitor circuit AGC
4949Log in adjusting the tuner AGC
5050Audio Output
5151The conclusion of accession decoupling capacitor sound demodulator
5252Decoupling capacitor control circuit power supply

Table 2. Pin assignment processor TDA8362


IF signal processing circuit
Amplifier drive image (UPCHI), is a three-stage differential
amplifier with adjustable gain and a symmetrical differential input
(vyv.45 and 46 of the TDA8362). Range of variation of the gain is not
less than 64 dB. UPCHI sensitivity (70 mV) is comparable with the
parameters of modern specialized TDA8362 UPCHI.
Maximum input signal to 100 mV rms. IF signal is demodulated using a
reference carrier frequency formed by the method of passive regeneration
of the carrier image. The reference circuit connected to dem vyv.2 and 3
TDA8362. He is the only element that requires customization. The
demodulator provides the ability to process IF signals with both
negative and the positive modulation. The scheme of automatic frequency
control (AFC) generates a signal to vyv.44 TDA8362, which provides a
tuning oscillator frequency tuner with an error not exceeding 50 kHz.
To operate the scheme uses the same reference signal as for the demodulator.
Built-in sample and hold circuits HRA gives protection against the
penetration of video. Capacitor circuits embedded in storage TDA8362.
Steepness of the characteristics of the AFC circuit (33 mV / kHz)
depends on the quality factor of the reference circuit. To reduce the
steepness of vyv.44 TDA8362 connect a resistor. Range of output voltage
is 6 V (at rated voltage 3,5 V). Characteristics of circuits for
modifying the AFC TDA8362-N5 is optimized for the European standard
drive. The scheme of automatic gain control (AGC) generates the control
voltage UPCHI and tuner (vyv.47 TDA8362), providing a constant signal
amplitude at the inlet and outlet UPCHI video amplifier.
To exclude the effect of AGC to the tuner at low levels of input
signal is introduced delay AGC. The delay is regulated by applying a
control voltage to vyv.49 TDA8362. Range etogo voltage 0.5 ... 4.5 V.
The minimum and maximum signal levels on vyv.49 at which the AGC circuit
to engage the tuner, is 0.2 mV rms and 150 mV rms, respectively.
AGC detector monitors the amplitude of the clock in the negative
modulation of the IF signal and the white peaks in the positive
modulation. To ensure immunity applies gating detector. Gating off on
time reverse field sweep. This avoids changes in the amplitude of the
video playback from a VCR because the phase shifts that occur when
switching the video heads. By vyv.48 TDA8362 connect a capacitor
(typically 2.2 uF), defining a time constant of AGC.
External connection etogo capacitor provides flexibility TDA8362.
Allowable leakage current of the capacitor is 10 mA for the negative,
and 200 nA for positive modulation. The increase in leakage current
degrades the characteristics of AGC circuits and leads to a change in
the amplitude of the video for the field. The voltage at the output of
the AGC (vyv.47) is at maximum gain (U num +1) B and a minimum gain
(saturation voltage) - 0.3 V.
Switching demodulator and AGC to IF signal processing mode with the
positive modulation by feeding on vyv.1 TDA8362 voltage value (U num -1)
B. Identification Scheme operates independently of the video
synchronization circuit that ensures that the tune the TV channel in
translation the TV monitor mode.
The scheme generates output (vyv.4 TDA8362) the following signals:

  • voltage not exceeding 0,5 V in the absence of video (with sound off detector);
  • 6 V when the input signal with a frequency of 3.58 MHz color subcarrier;
  • voltage 8 V when the input signal with a frequency of 4.43 MHz color subcarrier.

In the modified TDA8362-N5 has a mode of identification at detuning
tuner. For etogo with a weak signal is turned off gating circuit AGC
tuner while taking the pulse synchronization line scanning, which
prevents erroneous identification by the signals of outbreaks of color
subcarrier. Video amplifier provides video amplification detected,
alignment with the load and limiting noise emissions in the video
signal.
The scope of the output signal (vyv.7 TDA8362) is 2.4 V. The output
impedance of the amplifier to 50 ohms, the load current is less than 5
mA. Video Amplifier bandwidth (-3 dB) to 9 MHz, which provides the
possibility of TDA8362 in all standards of broadcasting. The scheme
provides emission peak white inversion above the level of 4,8 V, noise
emissions, having a level below 1.4 V (top clocks have a level 2), and
their introduction into the video signal levels in 3.2 and 2.6 in ,
respectively. In this scheme of inverting noise emissions only during
the reception of large signals, since a weak signal it adversely affects
the operation of the channel signal processing sound.
In the modified TDA8362-N4 scheme used to bind ultrabelogo peaks in
the video signal. In the modified TDA8362-N5 peak white limiting circuit
is not used, because when a large number of peaks of their white
inversion and the introduction of level 3.2 in the consequence that the
image becomes gray.

CIRCUIT PROCESSING OF SOUND
Stereo signal to a second IF sound, extracted from the full TV signal
arrives at vyv.5 television processor (TDA8362). At the same conclusion
through a resistor is fed the control voltage to adjust the volume.
Range control voltage 0 ... 5 V.
Sound IF signal is limited and goes to the demodulator, designed in
the form of a phase-locked loop (PLL). PLL is automatically adjusted to
the frequency of the input signal and requires no adjustments. PLL
capture range 4.2 ... 6.8 MHz.
Pre-amplifier (PA) provides amplification detected signal sounds to
the level of 350 mV rms. This signal is not adjustable in size, comes to
vyv.1 TDA8362, which connect an external capacitor to correct the
de-emphasis signal sounds, and the circuit switching and volume control.
IP also provides a mute in the absence Identification of video.
The signal from vyv.1 TDA8362 is used to remove the external
connector (for example, SCART). Stereo signal is fed to the external
connectors on vyv.6 TDA8362, its value is 350 mV rms. Switching scheme,
controlled by voltage applied to vyv.16 TDA8362, provides for the
formation of vyv.50 TDA8362 output sound, which comes on at
low-frequency amplifier.
The output signal, which is at the level of -6 dB from the maximum of
700 mV rms, when adjusting the volume varies in the range of 80 dB. DC
voltage at vyv.50 TDA8362 3,3 B (with muting 10 ... 50 mV). In the
modified TDA8362-N5 provides for protection of clicks in the speakers
when you turn on the sound, while using previous versions TDA8362 to
address the problem had to install 290 ohm resistor between vyv.1
TDA8362 and bus +8 B.
TDA8362 Switch mode signal processing with positive modulation by feeding on vyv.1 TDA8362 voltage not less than (U num - 1) B.

SYNCHRONIZATION CIRCUIT
Isolation of sync (SI) of the video signal coming into the vyv.13 or
15 TDA8362 by a selector that contains an amplifier, an amplitude
selector and a scheme of allocation of row and human SI.
Lowercase SI served on the first phase detector (PD1) and the
coincidence detector, which identifies the presence of the video signal
and controls the synchronization of the master oscillator (MO) line
scan. In the absence of sync voltage vyv.14 TDA8362 is low, which can be
used to identify the presence of video. PD1 in conjunction with low
pass filter (LPF) connected to vyv.40 TDA8362, and the MO line scan form
a PLL, which provides adjustment of the frequency and phase pulses MO
under the options row SR.
The time constant of PD1 is automatically switched (by switching the
internal resistance) on the signals from the detector noise and the
detector coincidence. With increasing noise level in the video signal to
vyv.13 TDA8362 time constant increases PD1 (output current is 30 uA).
In the absence of video time constant increases even more (output
current 6 mA), which provides synchronization of mode-screen display
(OSD).
When you receive a normal signal and processing the signal to vyv.15
TDA8362, the time constant decreases (output current 180 mA) to enhance
the capture bandwidth and increasing noise immunity circuit
synchronization.
To ensure quick compensation of phase errors in the signal from your
VCR when you switch the video heads, at the time of reverse field sweep
time constant has decreased by about 1.5 times (output current of 270
microamps). Thus, achieved good performance synchronization chain as in
the case of receiving a weak signal, and in the case of processing the
signal from your VCR.
Span video on vyv.13 TDA8362 (including sync) must be at least 2 when
receiving a normal signal. Otherwise, the detector noise will switch
the time constant at a lower level of IF signal (switching occurs when
the signal / noise ratio 20 dB), which would lead to "shake" signal
phase MO line scan.
To ensure the independence of the phase image of the line scanning
frequency (15.625 or 15.734 kHz) static characteristic PD1 has a very
high slope. MO line scan runs at twice the frequency of line scan. Its
frequency is automatically calibrated by adjusting the scheme by
comparing it with the frequency generator with quartz stabilization
chroma decoder. As a result, the frequency of free vibrations of MO has a
deviation of not more than 2% of the central values. When you start the
calibration is always carried out by quartz 4.43 MHz, if not selected
the compulsory inclusion of quartz 3.58 MHz.
The second phase detector (PD2) provides for the formation of vyv.37
TDA8362 trigger pulse line scan and the maintenance phase of these
pulses relative to the pulse mode MO capture in PD1. PD2 with LPF
connected to vyv.39 TDA8362, and the MO form a PLL. The initial phase of
the image set variation of the external load connected to vyv.39
TDA8362. Shift range is ± 2 microseconds when the regulatory power
within ± 6 mA. Impulses reverse line scan required for PD2, arrive on
vyv.38 TDA8362.
The same conclusion formed combined gating pulses required to operate
the integrated circuits of the delay line (TDA4661 or TDA4665) and
decoder SECAM (TDA 8395).
Gating pulses have the following options:

  • Voltage-binding during the pulse reverse: 3 ± 0,4 V;
  • voltage during blanking interval: 2 ± 0,2 V;
  • voltage for the flash of color subcarrier: 5,3 ± 0,5 V;
  • quenching pulse width of the field: 14 lines;
  • pulse width allocation flash: 3,5 ± 0,2 ms.

When you use this TDA8362 can be implemented protection against
X-rays. For etogo external monitor must provide a constant voltage
switching (at least 6 in) on vyv.39 TDA8362. In this case, stops the
formation of start pulse line scan, and the voltage at vyv.37 TDA8362 is
approximately equal to the supply voltage. If the voltage on vyv.39
returned to normal levels, then reappear vyv.37 trigger pulse.
Pulse parameters starting line scan:

  • lower level of output voltage: 0.3 V;
  • maximum level: U num;
  • pulse: 2;
  • maximum output current: 10 mA.

Starting the MO line scan by feeding on vyv.36 TDA8362 voltage 8 V
(minimum drive current 6.5 mA). It is noteworthy that can run when the
current is 5.5 mA. It is not carried out the calibration so that its
frequency is higher than the nominal (maximum frequency deviation is
75%).
In the modified TDA8362-N5 maximum frequency pulses run is bounded by
20 kHz. With decreasing voltage vyv.36 TDA8362 to 5,8 in the formation
of the trigger pulse is immediately terminated. If you do not use the
pre-run MO, then vyv.36 and 10 of the TDA8362 is connected to the power
bus 8 V. When the voltage on the separation power vyv.36 must always be
greater than or equal to the voltage on vyv.10 TDA8362.
Control pulses for the MO field sweep, which is a sawtooth generator, obtained by dividing the frequency of MO line scan.
Frequency divider has two modes of operation.
Regime of "big box" is included in the absence of synchronization, or
when receiving non-standard signal (number of lines in half-frame from
311 to 314 at 50 Hz and from 261 to 264 at 60 Hz). In this case the
divisor is in search mode and switches to the frequency of 45 Hz on the
frequency of 64.5 Hz.
Mode "narrow window" is enabled when detected more than 15 consecutive human clock.
This is the standard mode of operation. Reversal of Sr in the absence
of clocks included at the end of half frame (window), which provides
minimal image distortion.
Switched back divider in the search mode occurs in the absence of
human clock for 6 consecutive periods of the field sweep. By vyv.42
TDA8362 attach external RC-chain MO field sweep.
Sweep ramp voltage vyv.42 is 1,5 ... 1,8 V. The TDA8362 vyv.41 a
pulse reverse field sweep (with the output stage), providing a linear
output voltage.
DC voltage at vyv.41 is 2,5 ± 0,5 V, AC voltage of 1 V. In the
TDA8362 provides protection from burn-through when the kinescope fault
Vertical, which provides a quenching rays at increasing or decreasing
the DC voltage on vyv.41 TDA8362 1 , 5 (with respect to the above).
Vertical control pulses generated by vyv.43 TDA8362. The maximum and
minimum voltage of 4 and 0.3 V.
Maximum allowable output current of 1 mA. Delay on the field sweep
when the power is 140 ms, while the output voltage is high. When you
start MO field sweep included the frequency of 60 Hz.
In the modified TDA8362-N5 launch is carried out on a frequency of 50
Hz, which is used for screen display. Voltage on vyv.43 TDA8362 when
you turn on a low level that facilitates the startup mode of the field
sweep.
Chain synchronization TDA8362 TDA8362 provides a reliable upper and
lower frame sync images in the processing of the VCR in the case of bias
on the clock phase (when the stretched tape), and in case of playback
tapes with copy protection.

VIDEO PROCESSING CIRCUIT
Full color television signal is allocated for vyv.7 TDA8362, pass
notch filters for suppression of the second intermediate frequency
sound, and comes to vyv.13 TDA8362 (internal signal). At vyv.15 TDA8362
signal from the external input (external signal).
Sweep signal vyv.13 (including sync), 2 ... 2,8 V, and the vyv.15
TDA8362 1 ... 1.4 V. Switching the input signal by circuit switching,
controllable voltage level vyv.16 TDA8362 (U 16). When U 16 <0,5 B
processed internal video and audio (notch filter, which provides
suppression of the chrominance signal included). For 3 handled external video and audio in the standard S-VHS. In this case,
vyv.16 TDA8362 chroma signal, and the vyv.15 - luminance signal. Notch
filter in this mode is disabled. When U16> 7,5 In processed external
video and audio (notch filter enabled).
TDA8362 contains a notch and bandpass filters for signal separation color and brightness.
Setup filters for automatic adjustment of the filters in accordance
with the frequency of a quartz oscillator, which is part of the decoder.
By vyv.12 TDA8362 connected decoupling capacitor circuit configuration.
In the modified TDA8362-N5 resonant frequency notch filter in the
processing of the signal in the SECAM system is reduced to 4.2 MHz for
better suppression of subcarriers DR and DB in luminance. Calibration
filters is carried out during the reverse field sweep. Luminance signal
is fed into the delay line (480 ns) and high-frequency correction
circuit that ensures the rise of the frequency response at high
frequencies, then the scheme matrixing. vyv.14 TDA8362 is used to
control high-frequency correction circuit (clarity). The range of
control voltage 0 ... 5 V. When voltage is applied to vyv.14 7 The
correction circuit is disabled (nominal mode). In the absence of video
signal current consumption for TDA8362 vyv.14 increased to 1 mA (in
versions N3 and N4 - to 200 microamps). Voltage on vyv.14 thus reduced.
This information can be used for proxy authentication video.
Chrominance signal fed to a bandpass filter and amplifier with AGC,
and then to the decoder, which includes a generator with quartz
stabilization of the frequency demodulator chroma signals (CRC) and the
color scheme off.
Generator that generates a signal reference subcarrier PD and low
pass filter connected to vyv.33 TDA8362, form a loop system that
provides synchronization in frequency and phase reference signals with
the subcarrier signal burst (EDN). By vyv.34 and 35 TDA8362 connect
quartz crystals, with vyv.35 to connect the cavity with a frequency of
4.43 MHz, as This frequency is used for calibration 3G line scan, and to
vyv.34 - resonator with a frequency of 3.58 MHz.
When using a quartz or connecting two quartz to the same conclusion
(usually vyv.34) and an external circuit switching vyv.35 TDA8362
connected to the power bus through a resistor 47 kOhm. This ensures that
the forced inclusion of the generator.
When using modifications of N4 and N5 TDA8362 resistor is reduced to
8.2 ohms. This is essential to ensure the calibration 3G line scan. The
scheme of automatic detection system provides a recognition signal
chrominance in PAL and NTSC and switching circuits for signal
processing.
For processing the color signal in the SECAM system uses the decoder
TDA8395, which is served with vyv.32 TDA8362 reference signal is 4.43
MHz. The amplitude of the reference signal 0,25 ± 0,5 V. In case of
proxy authentication chrominance in PAL or NTSC voltage vyv.32 TDA8362
is 1.5 V. In the absence of proxy authentication scheme disables the
chroma demodulator outputs SDLC (vyv.30 and 31) and the voltage at
vyv.32 TDA8362 increased to 5 V. This voltage is blocking off the color
scheme in m / s TDA8395 and connects its output CRC.
The current consumed with TDA8395 TDA8362 vyv.32 in identifying the
color signal in the SECAM, is 150 mA. Increasing the current to this
value is forcibly switched mode TDA8362 SECAM. In this case the scheme
of automatic detection system does not search for chrominance signals in
PAL and SECAM. Forced to switch to NTSC mode TDA8362 impossible.
Color signal for the TDA8395 may be obtained on vyv.27 TDA8362 etogo
when connecting the output to the power bus through a resistor 4.7 ...
12 ohms. Signal swing is 330 mV. This combination of chips can only be
used as a decoder PAL / SECAM. in the case of signal processing color
systems PAL / SECAM / NTSC uses external circuit selection color signal
for TDA8395.
It should be noted that the use of modifications of the N4 and N5
TDA8362 to prevent false identification signal from a VCR in both NTSC
SECAM is necessary to provide voltage vyv.27 TDA8362 no less than 6 V.
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عدد المساهمات : 542
تاريخ التسجيل : 16/06/2010

مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 1:53 pm

Faults TV
(From the practice of repair)


Abbreviations: MF - motherboard. "BP" - Power Supply. "PC" - CRT board.

Monoblock FUNAI MK7. Appear on the image damping
band. Increased brightness. Treatment: Replacement of Lt. C24 (1mkF
at 250V) nutrition video amplifier.

Panasonic TC-21L10R2. Periodic impairment
image (the image becomes dull - significantly reduced the video signal).
Sound remains normal. Reason: faulty emitter-follower
transistor Q117 (planar) in the submodule MS-BOARD (it still stands MC
M52317SP). Replaced the KT315.

AKAI 2107D. After a fire caused by the drying
electrolytic capacitors in the power supply, lower torsion and no color.
Reason: AN5601K. First, it should be noted elements, along which the momentum
with TDKS (7 feet) to the specified chip. R424 (10 k), zener diode in
5,1 V and the diode.

MITSUBISHI ST21M5E. When you turn the screen brightly illuminates
with flyback lines. After a few seconds the TV goes into standby
mode. If you reduce the accelerating voltage (screen) to a minimum, TV
ceases to be switched off. Through the haze sometimes something as visible image
and technical information (channel number adjustment). At the cathodes of CRT
25-50V. Tried to change the chip video amplifier TEA5101B, but it is not
helped. This problem came across twice. At first thought,
that is out of order video processor MC44031B, which has no where. Yes, he
in principle, and is not needed. Breakage, as usual, was simple: the transistor
Q6E7 (JC501-R) on board the kinescope. KT315 put it!

VIDEOCON. Does not remember the tune to the program.
Proved to be defective electrolyte RC 603 (2.2 uF) Nutrition Products
Memory (-30V).

Sony KV-21V5K when you turn on the 1s. runs
lowercase, then disappears row trigger pulse from the video processor,
and after another 5 seconds. CPU disables the second power supply.
Candy bar goes into emergency mode, the LED blinks periodically to
2 times. If you heat the cathodes at 1 sec. lights up a beautiful screen, without
graphics and images but after 1 second, disappears. All returns are (row,
HR, OTL) come in the norm. Turned on and when pushing in the cassette
All engine work tape is moving 5 seconds, then crash. Defect associated
with ragged resistance R624.

AMSTRAD CTV140T. The device does not turn on
surge of high voltage is present. LED lights up constantly.
MP: resistor R529 has a burnt contact.

AMSTRAD CTV140T. The paper dealt clicks in the area
Cap kinescope. When the signal "red box" noticeably soiled.
Focus is poor.
CRT is defective. 37SX107Y22-DC05.

AMSTRAD CTV140T. When you turn heard the whistle. LED
lit.
MP: T402 defective 154-189H RF18JF17C.
CONDOR CA107. At work or under the mechanical action,
picture darkens for a few seconds to a dark screen. Audible high-frequency
squeak.
MP: leg number 1 of the transformer T551 has a bad contact.

CONTINENTAL EDISON CE2825. No color.
MP: HT800 17.734475 Hz is revealed defective heating and cooling of the
quartz.

CONTINENTAL ST1411. No color.
MP: HT800 defective 17.734475 Hz.

CONTINENTAL CT1412. The image has a predominance
green. When setting up the geometry, the indicator Majesty "G2"
"Red Square" does not disappear from the screen.
MP: IC800 defective TYB44007P Leg number 20 indicates a short circuit at
mass.

CONTINENTAL CT/ET2011. CRT: A48ECR41X15 replace
on A48EAX13X091.

CONTINENTAL CT/ET2015
. Standby works,
but the instrument is not included. Almost all the voltage is. LED lights
not blinking.
MP: IC650 defective CF70200NW.

CONTINENTAL CT/ET2015. Switching signal "AV1"
to "AV2" impossible.
Payment AV: IC4 defective MC14053BCP.

CONTINENTAL CT/ET2115. No picture, only visible
raster. But the menu is.
MP: Track between L602 and L600 damaged.

CONTINENTAL CT/ET2115. Lack of green.
MP: resistor R802 (SMD 100 Om) from plug CN800 (Green) PC: resistor
ca. 1 ohm (obozn.: "331") from the emitter of the transistor TR901.

CONTINENTAL CT2115. The device is not included. Mode
expectations of work.
MP: IC500 defective ST6375B1/BNS.

CONTINENTAL CT2115. The device does not turn on the LED
dark.
MP: IC500 is defective.

CONTINENTAL CT2115. No picture on the screen when
signal from the tuner.
Fee "AV" IC4 defective HCF4053BE.

CONTINENTAL CT2115. The sound of the signal from the tuner is
great distortion and noise.
MP: IC600 defective TDA4445B is obvious that this chip is a sound channel,
and the contour L604 adjusts the sound frequency.

CONTINENTAL CT2115. No teletext.
MP: IC650 defective CF70200NW.
CONTINENTAL CT2115. No teletext.
MP: XT650 defective 13.875-20 Hz.
EDISON MINERVA EM2825. Menu-method
pressing two buttons (-) and (+) programs, and simultaneous operation of the buttons
Power can go to the menu. After all settings - memory write button
"Update". If you made a full (reset), it is necessary to put
System "BG" This will give the opportunity to hear the sound.

EDISON MINERVA EM2825. Hear the whistle of an outsider
from the MP. The device works.
PSU: transformer T100 has a bad contact inside the core.

EDISON MINERVA EM2825. The device is not working. When
turn off R145.
MP: R145 defect 2 ohms, D125 defective MCR 22-6, IC104 faulty TCDT 1101G.

EDISON MINERVA EM2825. No color.
MP: H800 defective 17.734475 Hz.

EDISON MINERVA EM2825. When you turn there are signs,
when high-voltage part is trying to start, but the closure does not allow
accomplish this, the LED blinks in sync.
MP: inline transformer is defective 40332-27.

EDISON MINERVA EM2825. Is not fully working, the unit
supply is defective.
PSU: T101 defective P6NA60F1, R139 defective Om/5V 2.2.

EDISON MINERVA EM2825. The device does not turn on the LED
in the beginning barely blinks, then goes out. When you turn on lights slowly and slowly decays.
PSU: D111 is defective.

EDISON MINERVA EM3711. Geometry and compliance
Color images do not match.
MP: IC500 defective ST6365B1/BNR.

EDISON MINERVA EM3711. No vertical deflection. Horizontal bar on the screen.
MP: R200 defective 5.7 ohms.

EDISON MINERVA EM3711. The device does not turn on the LED
remains dark.
MP: R116 defective 0.22 ohms.

EDISON MINERVA EM3712. Channels are not configured,
image barely visible. Large disturbance.
MP: L401 defective (oxidized).

EDISON MINERVA EM3712. The instrument is difficult,
buttons do not work panel control and remote control. By activating
button remote control LED flashes.
MP: IC650ALT defective CF70095ANF.

EDISON MINERVA EM3712. High brightness
with the presence of lines of flyback.
PC: R918 68 ohm defective.

EDISON MINERVA EM3712ESP. When enabled, the LED
PSU is lit for one second, then goes out. Tapped signal-to-beat.
MP: T300 defective TERMAL 003 071 058 274 004.

EDISON MINERVA EM5112. When operating the device (the signal
with AV) brightness is not recorded in the processor memory. Brightness is constant on
maximum.
MP: IC500 defective ST6365B1/BNR.

EDISON MINERVA EM5112. Setting up channels is virtually
impossible. The image appears and immediately disappears.
MP: TUN600 defective TERMIC KHC 3400 3 / 5583.

EDISON MINERVA EM5112. Chromaticity is missing or
pulsating.
MP: HT800 defective 17.734475 Hz.

EDISON MINERVA EM5112. When you turn on the LED flashes,
hear the faint sound cycle.
MP: inline transformer is defective 4031-19.
EDISON MINERVA MT5115. Is not fully working.
PSU: F100 (2,5 A), TR100 (P4MA80F1), D115 (BY299), D100, D103 (1N4007),
and diode PH-37K without feet on the back side of the board. MP: R915 defective (Korich.
Chern. Chern. Evils. Fiola).

EDISON MINERVA MT5115. On the screen horizontally
bar, no vertical deflection.
MP: R200 defective 5.7 ohms. PC: R918 68 ohm defective.

EDISON MINERVA MT5515. The device is not included, no
high voltage. LED lights.
MP: D115 defective PH33G.

EDISON MINERVA MT5515. The device will not turn on buttons
management. Standby mode works.
MP: R119 defective Om/5V 6.2. PC: R918 is defective.
EDISON MINERVA MT5515ESP. Is not fully working.
LED remains dark.
MP: D115 PH-33G. PSU: inline transformer 40331-29.

EURO LINE CTV14T. Is not fully working.
PSU: D506 defective RS205.

GRÜNDIG P37-070. Setting up channels is
by pressing the "PC / AUX" remote. If any
or functions are blocked (eg sound increases only for half
- It can be seen on the cursor), then you need by pressing the power button
device and "I" button remote control to activate the input
On the Table menu settings. "HOTEL" "OFF" "DECODER"
"OFF".


MAGNUM TV7050VT. If activated the access key
to use the device. On the remote, press the button: 1) "down"
2) "Up" 3) "left" 4) "right" 5) click
"OK" or "M" service code "089."

MAGNUM TV7050VT. Details of modernization: 1) SMT Capacitor
C14 must always be fed to. 2) SMT resistor RP36 resistance at 22
ohm (symbol "223"), should be replaced by resistor
4,7 kOhm. 3) Capacitor SR13 must be replaced. 4) RP40 should be
replaced.

MAGNUM TV7050VT. After replacing ICM2 (Eprom) may
that when you set up channels, setting does not happen (will not be found any
one channel or the quality settings will be very bad). In this case,
need to go to the Setup menu, click "Tunerparameter" and set
value "AGC-Adjust". For example a value of 12 units. At the same time
parallel change the value of "AGC-Voltage". For example in this
If it is 131 unit.

MAGNUM TV7050VT. When troubleshooting, capacity
cliff jumper W216, you can create arbitrary inclusion of the device after
energisation. This method of artificial instrument power
applicable in many cases, if the PSU itself is not included. (After
inclusion on the screen horizontal bar).

MAGNUM TV7050VT. There are several parent
Motherboard:
1) under Videosolor keniskop
2) under the Panasonic keniskop
Where to put Videosolor keniskop fee from Panasonic, possibly
Symptom as pincushion distortion can not be aligned.
TE Pillow is easily pronounced concave shape. Limit adjustment
in the setup menu stops at "0" The reason for the difference of values
resistor RD37.
1) Videosolor on board, he has a value of 2.5 ohms
2) and the Panasonic board its value 1.5 ohms.
Caution: Despite the small difference between the values ​​of resistors, so no
less is strongly reflected in the geometry of the picture.

MAGNUM TV7050VT. When you turn, right on the screen
appears blue box menu.
MP: ICM2 defective 24C081.
MAGNUM TV7050VT. When you set up channels, the cursor
Table menu runs to the end, but no channels tuned.
MP: corner boards in the tuner has a crack, resulting in damage
three tracks.

MAGNUM TV7050VT. Geometric distortion.
Image is shifted to the left.
MP: DD3 defective, CD7 should be replaced by 4.7 mkF/160V.

MAGNUM TV7050VT. When you turn on in standby mode
LED is just one moment, then goes out. In listening to the speakers
signal-to-beat.
PSU: DP8 defective PH-33J.

MAGNUM TV7050VT. After 10 minutes of the device,
vertical stripes become wavy character.
MP: X3 defective 503F 1912 is revealed by thermal effects.

MAGNUM TV7050VT. We hear the signal-to-beat.
MP: OPT1 defective TCDT1101G.

MAGNUM TV7050VT. When you turn on audible signal cycle.
LED remains dark.
MP: DD1 defective BY228TFK.

MAGNUM TV7050VT. Pincushion distortion. Customize
impossible.
MP: QD4 defective BDX53C.
MEGAS M9814. The blue color is bad or missing. Perhaps
banding on the screen.
IC1 (TDA8362A) is defective.
MEGAS M9814. In the sound clicks discharges in
row area of ​​the transformer. Just heard "rustling" high
anode voltage of kinescope (picture available)
MP: inline transformer is defective. Obviously winding insulation begun to leak
and leaking high voltage to the core. As a result, a number of
standing elements such as RD63 and CD55, on their breaks sometimes spark at the core.
MEGAS M9814. No picture. Sound and picture tube heat
present. As the value of "G" becomes visible raster
with flyback lines.
MP: IM1 defective ST6387B1/FHK.
MEGAS M9814. Blue and red are not available.
MP: IC2 is defective TDA4665.
MEGAS M9814. Almost no sound, only the background
heard. When a signal through the AV, the sound is heard briefly (2 sec.)
MP: ICM1 ​​defective ST6387B1/FBY.
MEGAS M9814. We lost color.
MP: HV1 defective 4.433619 Hz. Do not forget the body of quartz shorted to ground!
MEGAS M9814TXT. Image brightness is increased
with flyback lines. Calling the menu is possible. The picture is not visible,
but the channel tuning is possible by the sound.
MP: quartz HH1 has a bad contact. 13,875 Hz.
MEGAS M9814TXT. The sound is barely audible, even though the regulator
is the maximum position.
MP: IC1 defective TDA8362A.
MEGAS M9814TXT. Lack of blue and green.
MP: IC1 defective TDA8362A.


[email=%20sekator@mail.ru][/email]
MEGAS M9820. Standby mode works. When you turn
LED goes out, then heard two whistles and the LED lights up again.
MT: TRH1 defective (40331-20).
MEGAS M9820. By activating the pushbuttons
programs on the screen appear white chaotic horizontal stripes. All
the rest of the screen remains dark.
MP: ICM1 ​​defective ST6387B1/FBY.
MEGAS M9820TST. The device is not switched off after switching on.
High there.
PC: IC1 is defective. TEA5101V (video amplifier). Easily detected by measuring
with respect to mass, brown wire "M" plug JV2 kinescope.
MEGAS M9821. When you turn on the LED flashes briefly
and goes out. High there, but no picture. Management and off parting
not possible.
PC: IC1 defective TEA5101B.
MEGAS M9821STXT. After switching will not turn off
or on a screen visible colors of the rainbow + jitter.
CRT faulty A48LPE02H01.
MEGAS M9821STXT. No high voltage. LED
off in standby mode. If you turn on the device, then control is impossible.
MP: RH6 resistor has a cold solder.
MEGAS M9821STXT. The picture shakes.
MF: C50 is soldered on the contrary (factory fault!) 2,2 mkF/100V.
MEGAS M9828. Setting up channels is impossible, no
signs of the signal.
Videotext defective module.
MEGAS M9828HP. Many channels are not configured or
configured poorly.
MP: tuner faulty HTP220S.
MEGAS M9821STXT. Various distortions on the screen.
Fee Teletext has a bad contact.
MEGAS M9928HP. Is not fully working.
PSU: F1 (1,6 A), QP1 (BU508AF), RP2 (1,8 kOm/5W) are faulty.
MEGAS M9928HP. Standby mode works. After switching
LED goes out and the device becomes unmanageable. No high.
PSU: SR27 (470mkF/25V) defects. MP: RD9 (1,8 kOm/5W), QR1 (VD234) burnt.
MEGAS M9928STXT. When you turn on or work lights
BS.
PSU: QP1 defective BU508AF. F1 defective 1,6 A MP: D05 has a bad contact.
MINERVA MT3712. Greatly enlarged color images.
But if you reduce the color almost to the end, it is quite normal image.
MP: R812 220 ohms is defective. The reverse side of board, a small resistor SMD
from the foot of the "6" plug SN800.
MINERVA MT3712. No vertical deflection. Horizontal
bar on the screen.
MP: R200 defective 4.7 ohms / 1,4 VA
MINERVA MT5515. No sound when the alarm with
AV1. On AV2 but listening to the hiss.
Module: IC1 defective MSP3400C-PP-C6.
MINERVA MT5511 (H). The device works bearing signal
with Av. But when you switch to one of the programs, the image shrinks by half.
If the device is left to work in a rhythm, it burns TN302.
MP: IC500 defective ST6365BB1/BIP.
PANASONIC TX-29AD50FB. The screen is only half
images (from the middle to bottom) or only horizontal stripes.
MP: IC451 defective TDA8350Q.
RADIOTONE TV376L. When you turn audible squeak circuit
line scan. LED is dark.
MP: transistor QH1 (BUH515D) is defective.
RADIOTONE TV376L. Image has increased
brightness with flyback lines.
PC: RV23 defective. 1 ohm.
RADIOTONE TV377. Features: If you remove the protective
display processor, you may encounter with an artificial fault:
function of control does not work.
RADIOTONE TV377AV. To configure the channel, you must
on the remote simultaneously press the "diamonds"
After pressing, the figure of the channel decreases and starts to blink. Pressing
Search ">>" you can activate the channel search.
When the channel is found by pressing the buttons "diamonds" can be
found a channel to remember.
RADIOTONE TV377AV. Grey picture with a dark snow.
The sound is.
MP: 7015 chip is faulty. TDA8361E replaceable by TDA8361. Heating the chip,
You can notice a change in the picture the better. Cool down, the screen becomes
gray.
RADIOTONE TV378AV. Vertical stripes after five
minutes of becoming wavy character (possibly shaky).
MP: IC1 defective STV2102B determined by thermal effects.
RADIOTONE TV378AV. Very bright image, with
line flyback. There may be a different kind of pulsating
bands.
MP: QH1 defective 1S2055N. RP25 defective 100 ohms. PC: RV23 defective 1k.
ICV1 defective TEA5101V.
RADIOTONE TV378AV. In this paper, or when connecting
Signal plug, suddenly lost picture.
MP: legs RF24 and RF25 short to ground (on-screen gestures).
RADIOTONE TV378AV. In the image disappears.
MP: TRH2 defective AT-ETH-20Y20BY.
RADIOTONE TV378AV. The device is not included. SR5 strongly
charged.
PSU: RP4 defective kOm/1V 330.
RADIOTONE TV386VT. Is not fully working.
PSU: Fuse 1500 (2A), the transistor 7525 (P4NA60F1 substitute for P4NA80F1
), The resistor 3519 (150 ohms), and possibly IC 7514 (TDA4605-3) - are faulty.
RADIOTONE TV386VT. The device is not included. LED
flashes.
MP: 5445 line transformer is defective.
RADIOTONE TV388VT. Manage remote control
virtually impossible. Many of the features (eg sound) are not regulated.
You may need to double click the remote button.
Remote Control: X1 defective CSB 455E Y.
RADIOTONE TV388VT. Standby mode works. When
activation of any button or remote control programs, from the speaker
audible signal cycle, the device is not included.
MP: S601 has a closure.
RADIOTONE TV388VT. No sound.
MP: I401 closure between legs № 5 and № 6 TDA7056A.
RADIOTONE TV388VT. When you turn on the network and press
the power button, the device is switched on (although it should be on standby)
The screen is dark, high voltage and the heat is. Management fee: Connection
cable, stuck between the plastic and the rim of kinescope, thereby short
to ground.
RADIOTONE TV388VT. The screen is dark. All voltages
is, except the heater voltage kinescope.
MP: leg number 10 inline transformer has a break and filament voltage
does not arrive at R674.
RADIOTONE TV388VT. Is not fully working.
PSU: F01 defective 2A/250V. C8 is defective 102K 1kV.
RADIOTONE TV2050VT. If activated the passcode
device, then remove the code can be as follows:
There are five types of remote control panels for this device. Each type
panel may have a different chip. Method of creating a bridge by
deactivation code.
1. when chip M3004LAB1 legs 2-18
2. when chip SAA3004P legs 2-18
3. when chip K51900-43 foot 18 and anod of D6
4. when chip OHS2015DN leg 18 and anod of D6
5. when chip GMS30150 legs 4-17


عدل سابقا من قبل محمد أشرف عثمان في الجمعة أبريل 22, 2011 2:26 pm عدل 1 مرات
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عدد المساهمات : 542
تاريخ التسجيل : 16/06/2010

مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 2:01 pm

RADIOTONE TV2050VT. The image is sometimes pulsating,
noticeable jitter vertical lines.
MP: inline transformer is defective (thermal 003,071,030 substitute for the RT-604200000280
003071046).

RADIOTONE TV2051VT. High brightness.
Not regulated "G2" regulator.
PC: R219 has an incorrect value of resistance 47 ohms It, but should
be 10 ohms. (With production error).

RADIOTONE TV2051VT. No sound.
MP: I101 defective TDA8361.

RADIOTONE TV2051VT. When enabled, the screen is monochrome
(Gray) when you switch on the tuner or AV, the screen goes blue field.
The menu is.
MP: I101 defective TDA8361.

RADIOTONE TV2051VT. The device is not included. LED
remains dark.
PSU: R108 220 kohms defective.


RADIOTONE TV2051VT. Once on, the picture remains
dark, although the high voltage and the heat of a kinescope. With increasing
brightness "G" becomes visible horizontal bar (no
Vertical).
MP: D603 defective FR155, R611 is defective.


RADIOTONE TV2051VT. The device is not included. LED
continues to burn.
MP: T601 defective FCV-20C001R.


RADIOTONE TV2054VT. For entry in the table menu, the device
need:
1) click on the "M" remote.
2) go to menu "install"
3) enter the code: "4725"
4) make necessary adjustments.


RADIOTONE TV2054VT. Can not configure the channels.
Signs of the signal on the screen is not visible. View the signal through
AV-in is possible.
MP: Loss of track in feet, "S818" (as a result of not energized
Supply +10 V to stabilizer chip IC807, therefore, from chip
leaves only two in, instead of +5 V. And the tuner does not work).


RADIOTONE TV2054VT. High brightness on the screen
line flyback.
MP: D408 defective BZX55C (has a small leak, it's hard to find!).



RADIOTONE TV2054VT. The image has a pronounced
red shadows. (Color may vary).
MP: IC401 defective TDA8840.


RADIOTONE TV2054VT. The screen remains dark after
inclusion, but the sound is.
MP: IC401 defective TDA8840.

RADIOTONE TV2054VT. In the image disappears.
The menu is missing. LED lights up green. The sound is.
MP: IC401 defective TDA8840. Determined by thermal effects. When
heating of the image disappears.


RADIOTONE TV2054VT. Image is shaking heard
rustle inline transformer.
MP: inline transformer is defective 40337-19.


RADIOTONE TV2151VT. The image has a strong brightness
with flyback lines.
PC: R219 is defective. (Through a resistor 185V line) / brown. Chern. Chern.
Ash /

RADIOTONE TV2151VT. Hear the strange sound, reminiscent of
the sound of arcing contact. At work, the device is not impaired.
Otklonayuschaya coil: one of the magnets (left or right) has no stable
fixation, and therefore vibrates.


RADIOTONE TV2151VT. No teletext.
I451 chip is faulty.


RADIOTONE TV2151VT. The device will not turn on buttons
management and control. LED lights.
No voltage +8 V on the PC. MP: T601 defective. (Transformer FCV-20C001R
Samsung PLCFd VDE Reg.-Nr. 5266).


RADIOTONE TV2151VT. Is not fully working.
PSU: R5 is defective. 675 kOm/1V.
RADIOTONE TV2151VT. Is not fully working.
PSU: F01 (2A), Q1 (K2545 or BUZ90A), C8 (BN 102k 1kV) are faulty.


RADIOTONE TV2151VT. Is not fully working.
PSU: R5 680 ohms is defective.


RADIOTONE TV2151VT. The device is not included. LED
lit.
MP: H301 has a bad contact.

RADIOTONE TV2151VT. The vertical bar on the screen,
No vertical deflection.
MP: L602 has a bad contact.


RADIOTONE TV2151VT. No sound.
MP: I101 defective TDA8361.

RADIOTONE TV2151VT. The device is not included. Mode
expectations of work.
MF: R21 is defective.
RADIOTONE TV2151VT. Screen monochromatic gray. Menu
there. Channel tuning impossible. View images for admission through
AV possible.
MP: I101 defective TDA8361.

RADIOTONE TV2151VT. The image has a pronounced
geometric distortions in the form of violation of the linearity and vertical size
horizontally.
MP: T601 defective FCV-20C001R.


RADIOTONE TV2161VT. You can not configure a single
channel. The cursor goes in a circle without clues.
MP: No +12 V at the foot of number 9 chip IC303. Possible crack
a path connection or a production error on the track.


RADIOTONE TV2198VT. The image sometimes disappears
or non-existent.
MP: R817 has a bad contact.


RADIOTONE TV2198VT. Is not controlled by remote
remote control.
MP: 9034 T827 phototransistor is defective.

RADIOTONE TV2189VT. High-frequency squeak appears
after a few minutes of work.
MP: L401 defective. Has a bad contact inside the core.


RADIOTONE TV511. Strongly distorted vertical
liniaritetnost.
PSU: C25 defective 47mkF/160V.


RADIOTONE TV7050VT. The device does not turn constantly
in standby mode.
MP: Quartz processor HM1 defective. When measuring waveforms generation
no. 18.000 Hz.

RADIOTONE TV7050VT. Signal disappears. Unsustainable
image without color with big noise. Perhaps when mechanical vibrations.
MP: cm6 defective 1nF/50V downside board SMT capacitor.

RADIOTONE TV7050VT. Sometimes the missing channels. Only
Channel Range VHF-1 remains unchanged.
MP: SR34 defective 1nF/50V downside board SMT capacitor.

RADIOTONE TV7050VT. Standby mode works. When
off observed a surge of high voltage. But the device does not turn off
and goes back into standby mode.
PSU: RP25 defective 0.2 ohms.


RADIOTONE TV7050VT. The device will not turn off audible
cheeks of the speakers. Standby mode works.
MP: DD1 defective BY228TFK.


RADIOTONE TV7050VT. Vertical lines in all
corners of the screen have a pincushion distortion. But basically the whole geometry
matches.
MP: QD4 defective BDX53C.


RADIOTONE TV7050VT. At the standby mode, audible
flicks.
PSU: ORT1 defective TCDT1101G.


RADIOTONE TV7050VT. In standby mode, LED
flashes. Inclusion is not possible.
PSU: DP8 defective 33RN.


RADIOTONE TV7050VT. If mechanical damage
holders of cards, you may experience such a failure: Enable
instrument can be heard takane coming from the speakers. No picture.
MP: DZP3 defective, RP25 defective.


RADIOTONE TV7050VT. The device is suddenly switched
with mechanical movements.
MP: DM2 has contact with the ground (screen).

RADIOTONE TV7090VT. Pincushion distortion.
Fee adjustments: IC751 defective TDA4950, C752 defective mkF/1600V 0.01.


RADIOTONE TV7090VT. Is not fully working. LED
remains dark.
PSU: S665 defective 220mkF/400V.


RADIOTONE TV7095VT. Some programs range
"VHF-1" is not configurable. Possible replacement of high channel
on the other (swap).
MP: Q162 JC558 replace defective in C558B.


RADIOTONE TV7098VT. When you turn the first to appear
green dot on the left side of the screen, then it becomes visible horizontal
thin strip. No vertical deflection.
MP: I576 defective TDA3654. Poor contact of several feet, called fault
chip.

RADIOTONE TV7098VT. Is not fully working.
PSU: T103 (2A), Q101 (K2545) are faulty. MP: Q602 is defective BU508AF.

RADIOTONE TV7098VT. Standby mode is not defective. When
device is turned on, starts to burn R711 module cushion adjustments
"28-EW COR" No pictures.
MP: C600 (1mkF/250V), R618 (5,6 ohm), S620 (0,47 mkF/250V), R711 (3,5 ohm)
faulty.

RADIOTONE TV7098VT. No picture. LED
lit. High voltage is.
Module cushion adjustments: R711 burnt. MP: S620 defective
(0,47 mkF/250V), R605 is defective (5,6 k) but you can put 15 ohms, L679
defective 10 mg.


RADIOTONE TV7098VT. Pincushion distortion.
MP: L679 defective 10 mg.


RADIOTONE TV7098VT. Is not fully working.
PSU: R103 defective kOm/1V 47.
RADIOTONE TV7098VT. Is not fully working.
PSU: R109 680 kohms defective.

RADIOTONE TV7098VT. Standby mode works. All
voltage is. The device will not turn on the controls.
MP: Q602 has a bad contact.

RADIOTONE TV7098VT. The device is not included.
MP: Q602 is defective BU2508DF.

RADIOTONE TV7098VT. The image can be black and white.
Picture shifted to the side or dislodging the frequency.
MP: P301 misconfigured.


RADIOTONE TV7098VT. The device is not included. Mode
expectations of work.
MP: D577 defective BY228PH.
RADIOTONE TV7098VT. Vertical frequency is insufficient,
has "wrapped" or "mirror" in nature.
MP: S578 defective 47I K.
RADIOTONE TV7098VT. The horizontal bar may
flashing. No vertical deflection.
MP: S578 defective 47I K 470pF/50V.

RADIOTONE TV7098VT. Strongly distorted vertical
linearity. Table menu is constantly jumping on the screen.
MP: S578 defective 47I K 470pF/50V.


RADIOTONE TV7098VT. The image is narrowed. Visible pincushion
distortion. Possible manifestation of this failure as a bad contact.
MP: S592 has a bad contact.


RADIOTONE TV7098VT. Some channels have weak
signal are configured poorly.
MP: tuner faulty TECC2949VG28C.

RADIOTONE TV7098VT. The device is not included. In the
waiting signal is heard-stroke.
MP: D574 defective 33B, I600 defective TDA8145.


RADIOTONE TV7098VT. Is not fully working.
PSU: F1 is defective 2A, T108 defective Telesan SMT9202 06.

RADIOTONE TV7098VT. The picture is strongly biased towards
(Left) Horizontal Center is not regulated. Radiator row transistor
really hot. Or after the second inclusion Q602 fails.
MP: T602 defective 1192. 1007 200000271.

RADIOTONE TV7098VT. No vertical deflection.
MP: R340 defective 3.3 milliohms.


RADIOTONE TV7098VT. Image disappears after
one minute of the device. Perhaps twitch image. Image
may suddenly decline and to reappear.
MP: Q580 is defective S1573A.


RADIOTONE TV7098VT. No blue.
PC: I001 defective TDA6107Q.


RADIOTONE TV7098VT. When you turn heard "rustling"
The device remains in standby mode, the inclusion does not occur.
PSU: T108 defective, damaged core. Often, after the fall of the instrument.

RADIOTONE TV7098VT. The image is not visible,
very high brightness on the screen. Visible line flyback. Perhaps
motor protection and then the image disappears damped point.
MP: connecting path between the leg number 3 line transformer and the D579.
track is damaged.


RADIOTONE TV7098VT. Is not fully working.
MP: Q602 is defective BU508AF, T601 defective AT-ETH-20Y20BY, Q580 is defective
S1573A.


RADIOTONE TV7098VT. Is not fully working.
PSU: F1 is defective 2A/250V, R103 is defective 47 kilohms, R112 defective 5 ohms, T108
defective.

RADIOTONE TV7098VT. When you press the power button
programs, the LED flashes once, the speakers can be heard a dull click,
device is not included.
MP: inline transformer is defective.

RADIOTONE TV7098VT. Horizontal bar on the screen.

Defective vertical scan. MP: R614 is defective.

RADIOTONE TV7098VT. The device is faulty, the LED
remains dark, the sound clicks.
MP: S592 has a bad contact, D577 defective BY228, R711 defective 2.2
Ohms.

RADIOTONE TV7098VT. We lost color
image.
MP: H300 defective 4.433619 Hz. Determined by thermal effects.

RADIOTONE TV7098VT. When enabled, the image
may have a lack of brightness. The image shakes and floats. Shadows
on the screen.
PC: mechanical closure between R002 and R005.


RADIOTONE TV7098VT. Is not fully working.
PSU: R103 defective 47 kilohms.
RADIOTONE TV7098VT. Is not fully working.
PSU: F1 is defective 2A/250V, Q101 is defective (K2545 is replaced by BUZ90AF). MP:
D125 defective BYV95C PH.

RADIOTONE TV7098VT. In standby mode, the LED
flashes. Listening to clicks.
PSU: S109 defective 1mkF/50V, R107 defective Om/2V 68, R112 defective 5 ohms.

RADIOTONE TV7098VT. The screen only horizontal
bar, no vertical deflection.
MP: I576 defective TDA3654.

RADIOTONE TV7100VT. Fee CRT: resistor R984
often undercooked.
It is noticeable that it is with production glitch. The power of this resistor is small.
It is advisable to change it in two cotton resistor 2.2 ohm.

RADIOTONE TV7100VT. LED lights, but the instrument
does not include the controls. Capacitor in the power supply is not depleted.
PSU: R125 defective 67kOm/2V.

RADIOTONE TV7100VT. Sometimes the screen disappears
color and can be seen fluttering strips of color. All image trembles on
horizontally.
Tuner module has a bad contact.

RADIOTONE TV7100VT. The picture has a geometric
distortion.
Processor module: EEPROM 1703 is defective 24C16.

RADIOTONE TV7100VT. The device is not included. Mode
expectations of work.
Payment Processor: H701 defective 18000 Hz.


RADIOTONE TV7100VT. When searching for channels on the screen
displayed cursor to the table menu. Error looks like this: a stopper
cursor or table itself menu starts jumping and flashing. Menu can do
absent.
Payment Processor: I701 defective SDA5250C17.

RADIOTONE TV7100VT. Standby mode works. Device
not included.
Payment Processor: I701 defective SDA5250C17.

RADIOTONE TV7100VT. The device is not included.
PSU: D111 defective RS206, Q101 is defective BUZ91A, I101 defective TDA4605-3
R125 is defective 68 ohms, F501 defective 3.15 A.

SABA T7045CVT. Standby works, the LED
lit. Inclusion of control buttons is impossible.
MP: CL48 has a bad contact. This causes a breakdown: TL31 faulty BU508A.



[email=%20sekator@mail.ru][/email]
SERINO STV2820. If you enter the lock mode through
code:
Long-term pressing (1.5 minutes) (-) sound, you can lock this
removed.

SMARAD MT3712VT. When you turn on the device (feeding
signal through the AV) and it works. When you switch to one of the pro tuner
Suddenly the image shrinks by half horizontally.
MP: IC500 defective ST6365BB1/BIP

SONY KV-D2921D. In the appliance turns off. Management
and re-inclusion is impossible. But if you turn off the power plug from
network and after some time to re-enable the device, the device is switched
and works until the next full shutdown.
PSU: leg number 1 of the transformer power supply T601 has a bad contact.

STRATO TV388VT. Is not fully working.
PSU: Q1 is defective (P5NA80F1 replace the BUZ90A), D5 defective BYV95C, R1 is defective
5.6 ohms.

TELE VIEW TV51120T / S. The device is defective.
MP: TV4 defective BD238, VD24 defective 1N4002.

ALBONA TV-17.1-70216.13 / P. The device does not work after
Education Smoke. LED lights.
MP: resistor R302 is defective 5.6 milliohms, but fit so well, and from 1.5 milliohms one
5.6 milliohms. Capacitor defective S309 1100pF/500V, or two consecutive
2200pF capacitor. The device is built on the motherboard NOKIA.

BLAUPUNKT FM100-300CTS. Setting the channel found
not stored in memory. When pressing the record button, "ME", begin
flash alternately on the front panel the two characters "ANTENNA"
and "SATELLITE". Memorization is not possible.
Retractable control module: chip V985 - HD6305Y1B80P defective,
replaceable by HD6305Y1B28P.

SEG CINEMA 2000 - Television in 16:9 format. No image
High voltage is absent. Changing channels and sound work.
MP: the transistor Q601 is defective BSN274. Transistor is not simple, is replaced
only on the original type.

SEG CINEMA 2000. We unexpectedly tapped flicks, accompanied by
streaking. The sound sometimes disappears. Table menu, instead of letters
can have symbols. Maybe shrink the image horizontally or
device is switched off. The device responds to mechanical stress.
PSU: filter choke TR803 has a bad contact.

AMSTRAD CTV140T. When you enable line transformer produces squeak
no picture.
MP: the transistor Q402 is defective D1555 possible to substitute for BU508DF.

BLAUPUNKT FM100-300CTS. The absence of high voltage. Screen
drawer lights, all control functions are working.
PSU: S469 faulty capacitor 1000mkF/25V. Smoothing capacitor line
18 V.


CONTINENTAL CT/ET2015. When you turn - a white screen and the crackle of discharge
in the CRT board.
After a 1.5 minute crashes D115. Picture tube is defective, possibly
has a short circuit.
CONTINENTAL CT2112. When enabled, the image has a strong brightness,
visible line flyback.
MP: resistor R315 is defective.

CONTINENTAL CT2115. The device is not included. Standby mode works.
MP: IC500 defective ST6375B1/BNS.

EDISON MINERVA EM5111. Audible noise as a mouse, or codfish,
gets on the speaker output when switching channels.
Audio channel: SMT transistor T550 is defective VS847. When measuring or comparing
difficult to fit or defect, so just substitute a comparable one.

GRUNDIG SUPER COLIR 8685. Is not fully working. LED remains
dark.
PSU: SI14 (4A) and S926 (3300mkF/40V) are faulty.

MEGAS M9814TXT. When enabled, the LED power supply first
burns brightly 1-2 seconds. Then the lights dim. Enable remote control
impossible.
MP: quartz HM1 faulty 8.000 Hz.

MEGAS M9814TXT. No vertical deflection. Only horizontal
band.
MP: resistor R41 defective 3.3 milliohms.

MEGAS M9814TXT. When you turn on, resistors RP70 and RP69 are extremely hot
No picture. High voltage is. Oval spot in the middle of the screen
flashes to the beat of a cod. Or an image as a white image brightness is not
regulated.
MP: inline transformer TD50 defective 40331-50.

MEGAS M9814TXT. No picture. High voltage is. Kinescope
heating up. No stress "G2" on the board of kinescope (must be
RV25 on about 360 volts).
Disconnect the CRT board and measure the voltage of "G2" if
strain appeared, then CRT is defective.


MEGAS M9814TXT. When you turn on the LED lights, high voltage
no.
Line transistor has a cold solder, (bad contact).

MEGAS M9820TXT. Is not controlled by remote control. Management
possible only through the control buttons on the front panel.
The control board (button): phototransistor IR2 defective.
MP: chip ICM1 ​​defective ST6387B1/FBY. № 35 foot (leg Input
from the control board) features a "defective" with respect to image
mass, compared with a working motherboard.


MEGAS M9820TXT. No vertical deflection, only horizontal
band.
MP: diode DD1 is defective ITT ZTK 33A.


MEGAS M9820TXT. The device is completely defective. Line Transformer
beeps. LED is dark.
MP: inline transistor QH1 defective BU508DF.


MEGAS M9820TXT. In this paper, after 2-3 minutes, the picture at the top
of the screen, slowly bend (bends to the right) parallel
this transistor QH1 very hot. When cooling or QH1 QH2 image
becomes normal.
MP: Transistor TD4 defective C548C.

MEGAS M9820TXT. The image is dark. When you add brightness (G2)
image appears, but the focus is bad (especially horizontal). Raster
can have such a reddish hue.
PC: connecting path between the RV6 and RV1 damaged.

MEGAS M9820TXT. When you turn on or work, there are lines back
progress. The image has such a greenish tint.
PC: plug picture tube may have a bad or damaged contact.

MEGAS M9820TXT. Setup program is not implemented. Indicator
Configuration is moving without stopping.
Radio: tuner module is defective THEMIC 3400 KHC.

MEGAS M9820TXT. When you turn the image has a high brightness
with flyback lines, within 10 seconds. protection is triggered and the device is switched off.
MP: Resistor RH1 defective. PC: M1 chip is faulty TEA5101V.

MEGAS M9928HP. When you turn on the LED is dark. Line Transformer
beeps.
MP: inline transistor QD1 is defective BU508AF.

MEGAS M9928HP. Image underutilized and visible pincushion
distortion.
MP: diode DD2 is defective. Noticeably change color when the appliance is turned on. Perhaps
PCB has no obvious signs of burning (around diode).


MEGAS M9928HP. When you turn on the LED is dark, there is no high voltage.
MP: connecting path between the lowercase TRD1 transformer and choke
RD4 damaged. RD9 defective resistor 1.8 kOhm.

MEGAS M9928HP. When you turn on the LED is dark, but the high voltage
there. With an increase in brightness with the G2 you can see the image: raster
with flyback lines.
MT:: stabilizing chip VR3 defective. Voltage +14 V input
present, and the output of +1 V, of course this is not enough voltage
for the processor as a result of the LED is dark.

ORION COLOR 512. The device is not activated when pressing the power button.
But if the power button to push harder in this state to hold approx.
2 seconds, the device is turned on.
PSU: SW501 defective.

SHARP SV-2889S (BK). Standby works, but including the appliance,
there is a surge of high voltage, the LED changes from red
to green and the device is switched off again going into standby mode, the LED
again illuminated in red.
PSU: diode D712 has a bad contact V92M.

SONY KV-M1400D. The device is not working, the LED is not lit.
PSU: diode line voltage line scan D604 is defective - RGP15J.
After replacing the diode, the device produces a hissing sound internal closures row
transformer T802, after a few seconds starts smoking R824. If
remove the leg 4 line transformer, Shiryaev sound disappears.
Line transformer T802 is defective 4618APCD 143943021.

Apparatus Samsung CK-5341ZR. After a short time after the
(From 15 minutes to several hours) starts to leave set-up, or when switching
from channel to channel sometimes does not capture the station. Rigged circuit APCHG
(In the piping TDA8362 he is one) - did not help. Replaced the zener 31 Volta
(In the circuit configuration) - has not helped. Changed very TDA8362 - no rezultata.Pomenyal
Memory (24C02)-pomoglo.Hotel not change the management processor (SIM-135-2R
S69540Y), but it is much too expensive. The owners took the time and iteration dlitelnye.Po Therefore,
I zafiltroval semiconductor capacitors low voltage
supply, voltage settings and changed the tuner itself. For the past two months
the unit is not buggy. Unfortunately, I can not pinpoint the cause - either the
tuner, or blow the setting surge in food. The fact that up to
that I repaired TV set with built-in Remote Control
55 channels, and he also lost their settings, so the cause was in
that have lost some capacity electrolytic capacitor 470 mkF/25
As for the 12 Volt power supply MP-3-3. From the same voltage fed
and a processor SAA1293 in control. The image loss in capacity has no effect.
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عدد المساهمات : 542
تاريخ التسجيل : 16/06/2010

مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 2:28 pm

Faults TV (from the practice of repair)





AKAI CT-1405E/2005E

TV turns on but does not work. Secondary Voltage 16 and 112 in understated by 40 ... 50%
This
power supply is sufficient just to check on the replacement of
defective, for example, podoydet module MP-3 from the television
"Horizon". Check pokazala that a short circuit in the circuits do not
load (TV work). Detailed inspection revealed a defect ohmmeter filtering
capacitor C920 in the chain of +16 - poteryu capacity
Aiwa TV-A145

Disruption of Framing on subjects with high brightness
Sinhroprotsessor
integrated into the chip IC301 (TDA8759), input sinhroselektora - pin.
33. The audit revealed a faulty capacitor S329 - poteryu capacity of up
to magnitude 0.1 uF
Aiwa TV-C201 KER

DO NOT remembers the
volume level after turning off the TV. VOLUME scale is set at 32 nA.
Customize nA television channels preserved Cause of Failure - chip nonvolatile memory type 93S46. Replacement chip correct.
Akai CTW2103 "(chassis 11AK19PRO)

Dark
screen, screen barely visible. DO NOT visible on-screen menu. With
increasing accelerating voltage glow of the screen appears
Malfunction occur after installing a new row of the transformer (TDKS)
instead of the previously failed one. After replacing the chip video
amplifier type TDA6107 TV performance fully recovered.
Caish, Erisson (chassis 3Y01)

TV is very difficult to adjust to the program - a desynchronization, curved vertical lines
Trouble
was manifested only when running from the antenna. AGC voltage was
tested on a tuner, it will conform to standards. When testing the drive
with a tract pomoschyu test drive generator malfunction occurred, too.
AGC was faulty drive and was caused by a defective capacitor C 203
(podklyuchen to the pin. 3 chip LA76810).
Daewoo 20Q2M "(chassis CP-370)

nA screen shows a negative image with features of inaccurate settings nA TV channel Replacing the GPU type TDA8374A DO NOT fix the defect. Cause of Failure
in the defect diode D503 (leak) in the circuit of the transistor Q504.
To test a diode you must vypayat of the board.
Daewoo DMQ 2157

Low contrast image, the size of the raster is reduced When monitoring the output voltage power supply showed that they are
normally too low. This was due to malfunction of the electrolytic
capacitor S830 (1mkF 160) in the feedback loop. DO NOT turn on the TV It turned out that DO NOT run the power supply. The reason - the breakdown of the capacitor S543 nA board kinescope.
Daewoo DMQ-2157

With heating brightness decreases sharply, shrinking screen, the image disappears
Power
supply TV postroen STR50103A on a chip (see previous item). It is
noticed that at the time of manifestation of the defect voltage line
scan is reduced to 70 V. In order to synchronize supply ispolzuyutsya
pulse line scan, which are removed from the winding TDKS. Was found
substandard rations of one of the conclusions of this winding. posle
heating soldering compound were recovered.
Daewoo DMQ2036

Raster has top volvulus 10 cm wide and it can be seen through the flyback
Replacing
the GPU chip type TDA8374 and TDA8356 Vertical type of result is not
given. Capacitors in the "piping" staffing chips are OK. Malfunction was
caused by poterey data in nonvolatile memory. As a result of
reprogramming of the defect was eliminated.
Daewoo DTX-21Q2TK "(chassis CP-375)

When you turn on the TV DO NOT start line scan, constantly flashing LED Standby DO NOT come from the microcontroller enable signal voltage regulator 12
(TDA8138). Pulse amplitude nA bus SDA I2C interface microcontroller
DW370M3 understated to 2 V (instead of the 5 B). Proved to be defective
protective zener diodes D511, D512 (6V2), installed near the video
processor TDA8374A.
Erisson 14GX37A

Horizontal "folds" in the image and jitter
Typically, such a failure is caused by reduced or Completely poterey S564 capacitor (470 uF x 25V).
Funai 20 MK-2

There is no sound
Sound
is also absent, and when working with low input. AF amplifier is
working normally. Defective microcontroller was TMP 47C434N-R214: to
pin. 5 of the stress volume is zero. If the chip TMP 47C434N-R214 is not
found, as an interim solution can be postupit as follows: for volume
ispolzovat another conclusion of the microcontroller, such as pin. 2
(ispolzuetsya to adjust the contrast). In this case, the desired
clamping voltage contrast can be poluchit from 12 volt to pomoschyu
variable resistor 10 ... 47 kohm.
Funai 2000A-MK7

Image of the tuner "sluggish" screen menu is displayed normally. At 1 ... 2 o'clock image bounces back
Trouble
is typical for all models with an external line delays the luminance
signal. In this case - break (cold rations) delay line L209. If a short
jumper to close it, the image is restored
Funai TV-2000 II

C heating raster disappears from the power supply unit heard a whistling sound
This
problem is caused by a defect in proximity of the transistor cascade
line scan Q12 (2SC2271K/D/E). In operating mode, the transistor heats up
and it loses contact with the conclusion of the collector. Power supply
begins to run on ponizhennuyu load (line scan does not work), and
therefore poyavlyaetsya "whistle." Diagnosis is difficult because when
you touch schupom measuring device to the conclusions of the transistor
output connection can be restored.OSD black color, but should be green
Violation of due poterey capacitance electrolytic capacitor C50 100 uF x 25 V, the filter voltage 15 V (produced TDKS).Power supply will not start
Defective (leaking) S169 capacitor (1 uF x 160). He checked the replacement.The power supply generates povyshennye voltage (instead of 120 - 250)
Faulty chip IC7 (STK7348).The top of the screen visible through reverse field sweep, which disappear with heating TV
Defect is eliminated by replacing C41 (100 x uF 25V).
NA GRUNDIG chassis CUC-7350

Net Image, OSD and teletext display Replacing the video processor TDA8374 DO NOT lead to the elimination of
the defect. Defective vce were three types of chip output video
amplifier TDA6106 (pierced body nA dark current measurement outputs).
NA GRUNDIG chassis CUC-6300

When you
turn on the TV image is normal, but no sound. If nA remote press VOL +,
the sound appears, but when you release the button, the sound disappears The reason for this failure - the power switch. He is slipping contact,
parasitic leakage which leads to a similar manifestation. Fault DO NOT
determined by the ohmmeter. "Helps" just replace the switch.
GoldStar CB-14A86X

The normal method of essential gear is possible only in the range of VHF-H The inspection regime of the channel selector to DC found out that his
withdrawal nA VHF-H is always present control voltage. Turned out to be
faulty a discharge port of the microcontroller type LG8534-09B (analog -
ST9291J4B1/EEF), manages the band. [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] Fig. 2 Found solution to the problem without replacing the microcontroller
(see Fig. 2). Installable components nA figure marked in color.
HITACHI CMT2130

When you receive broadcasts in SECAM system image in black and white, and in PAL - color
Defect capacitor C5019 (3,3 uF).
Hitachi CP 2022

Horizontal folds nA image (see Fig. 3) [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] Fig. 3 Vertical output stage is made nA chip type TDA8172. Replacement
Products and electrolytic capacitors "binding" DO NOT bring success.
Defect was corrected only after replacing the capacitor S404 (100 nF)
connected to terminal 5 TDA 8172. It should be noted that such a defect
is found in other TVs in the Vertical are used integrated circuits of
various types, such as LA7830. Typically, this problem is eliminated by
replacing the ceramic capacitor in the "piping" of these chips.
Hitachi Fujian HFC-14PG2

Uncertainly opoznaetsya or not at all opoznaetsya color when receiving SECAM, while in the PAL color standard
In
this case, we can say with confidence that replacement is required chip
decoder SECAM type TDA8395P. However, it is seen that at the touch pin.
1 of the chip schupom measuring device, such as digital voltmeters,
opoznavanie becomes more stable. Installed by mounting resistor between
pin 1 Mohm. 1 TDA8395P and common wire repeatedly pozvolyaet do without
replacing this chip. It should be noted that when poiske defects
associated with opoznavaniem color system, the best bass ispolzovat TV
input and the generator of television signals.
Horizont 14E07

Periodically, the illumination of the screen with white color, visible line flyback Diagnosis of this fault was complicated by the fact that when extended
from the housing main board, it was shown DO NOT. In this model, applied
micro-type TCL-A30V02-TO8821CRNG, his counterpart - TMR8841. Observed
that during the Symptom nA constant voltage outputs R / G / B OUT
(findings 50, 51, 52, a microcontroller) was equal to about 8 V (at a
rate of 2.5 V). Peregibaniem board mounting location of the
microcontroller, you could sometimes make the appearance of the defect.
Propayka radioelements "binding" to the success of the microcontroller
DO NOT lead. Problem has decided to replace the microcontroller.
Horizont 51CTV-441

12 nA image shows dark vertical stripes, is also visible disturbance in the grid Defect was corrected by replacing the capacitor C10 in the submodule correction color conversion SCC-45 (filter feeding).
Horizont CTV-659

After some time, posle include image disappears and the screen poyavlyaetsya message "No Signal"
Defective controlled voltage 12 V on-chip TDA8138A.
JVC 21T1E Chassis MZ2

A few
minutes later posle including compressed raster Po vertically and
horizontally, if the TV did not immediately shut down, burn resistor
R923 (22 ohm) in the emitter circuit Q925 (2SA1013)

Checking
the output voltage of pokazala that they decreased by about half.
Detailed inspection of primary circuit source identified the faulty
diode D910 (RU1C) as part of a damping circuit for connecting parallel
winding 1.5 pulse transformer T901. posle replace the diode and resistor
rabotosposobnost TV restored
JVC AV-250M

The dimensions of the raster is strongly reduced, the screen is barely lit
Output
voltage is much lower than normal. In this case, replace the controller
type of power source AN5900 not solve the problem. With detailed
verification of elements affecting the level of output voltages, it was
noted that removing the capacitor S974 (0.01mkF) from the board
rabotosposobnost TV is restored.
JVC AV-6100

The destruction of the bulb blue kinescope, a leakage of coolant, burnout elements nA video amplifier motherboard kinescope Failure analysis (see Fig. 1) revealed that due to excessively tight
clamping heat sink to the glass picture tube, with its thermal expansion
cracked flask, and then came a high-voltage discharge with vcemi
consequences. [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] Fig. 1 This defect was observed in the devices, picture tubes have been made
in the USA. Models that have been established firm CRT PANASONIC, DO NOT
have this defect (the distance of the metal to the flask kinescope was
about 3 mm) and worked reliably. To fix the problem needs to be
replaced and restored kinescope picture tube board. When leakage of
fluid from the cooling system must remove it from the board. Add a lack
of fluid can be through medical syringe.
JVC AV21M2 Chassis CL

Picture and sound are absent, light screen, right vertical black polosa
Control
output signals of the microcontroller IC701 (M37212M6-109SP) showed no
signal on the pin clearing YS. 49. Was there potentsial 1 V. When
disconnecting the signal from the input video processor YS IC201 type
TB1226BN (vyv. 22) TV worked, but there was no picture OSD. Replacement
microcontroller
JVC C-1480, 210MH

C heating drift settings for programs
On
the processor submodule SBX-M001A raspolozhen DAC voltage setting in
which ispolzuetsya capacitor 014 (3.3 uF x 50 in). It often turns out to
be faulty. For prevention is recommended to replace just the capacitor
S016 (0,47 uF x 50 in).
JVC G21T

Some time working fine, then lost the raster in the TDKS loud clicks, blinking yellow LED on the front panel
On
the basis of the output transistor row waveforms do not meet the norm.
The reason for failure in quartz crystal frequency of 503 kHz, which
determines the horizontal frequency of the master oscillator on-chip
video processor M52343SP. Often the cause of the defect is a breach of
the soldering of his conclusions. Defect characteristic of the different
models of televisions podobnoy implementation of the master oscillator
line scan.
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عدد المساهمات : 542
تاريخ التسجيل : 16/06/2010

مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 2:29 pm

LG 20GF

TV spontaneously at different time intervals, switch standby
Faulty
electrolytic capacitor S408 (1mkF x 160) in proximity with the circuit
of the cascade line scan. It needs to be checked only by the
substitution.
LG CT-21Q42KEX "(chassis MC-019A)

Net frame and line synchronization Faulty processor TDA 9361PS/N2/4/0532. In some cases, install it using
the resistive divider nA output 40 of the circuit voltage 3.7 V, sync is
possible to recover. If it succeeds, you can restore the amplitude of
the luminance signal capacitance C538 must be increased to 47 ... 100
uF.
LG chassis MC-41A / B (LG-CF14/20/21E20LG GF-14/20/21A80Supra MC1485/2185)

In the SECAM system color in the image is not red or blue, the PAL system, everything is fine
In
the specific model was absent red. Control loop L502 showed a "cold"
solder (ohmmeter pokazal break the circuit). posle soldering circuit
color image to normal. If the circuit short circuit, ohmmeter to
identify it is rather difficult. In this case, it is recommended
pomenyat opornye contours of L501 and L502. If this poyavitsya another
color (natural color is abnormal) - replace a faulty circuit
Loewe Xelos M37 VT

Net color signal reception in SECAM system In this model, applied to the microcontroller type SDA5257-2G501 and
video processor TDA8842. In the service mode is not option "SECAM"
(choice of color SECAM). When connecting to a common wire output in 1923
SDA5257-2G501 option "SECAM" in service mode opens up and we can
activate it.
ORION 20MS

Bright screen, the line flyback, the image otsutstsvuet
RGB
signals are not postupayut the entrance fee kinescope. Faulty chip
Vertical type TA8445K - it does not work flyback generator.
Opera LCD O-TV-5005R

When powered
from an external source image is dark and low contrast. When powered
on-board vehicle network display is not lit, the supply voltages
correspond to the instructions on the board

povysheniem
voltage (from external source), brightness (intensity podsvetki) can be
increased almost to normal. The change in brightness occurs abruptly. It
turned out, the defect was caused by severe corrosion of the lamp
output podsvetki and breach of contact power connector. In dopolnenie
should be noted that in podobnyh devices for the convenience of their
location applied Automatic - Sensor polozheniya relatively poverhnosti
land, for which ispolzuetsya mercury switch. poetomu to repair the TV
tilted board can overturn the "pictures".
Panasonic TC-2150R "(chassis MX-3)

nA
image is visible below the gray "curtain" which moves up and down when
CO regulation accelerating voltage. nA place "blind" the image out of
focus Replacement GPU TA5192K (analog - AN5192K) DO NOT helped
feed the power supply voltage were normal. Turned out to be faulty
picture tube.
Panasonic TC-2161EE

DO NOT TV in standby mode, in operation vce ok. Over time, lost the picture and sound Reason: the parasitic conduction in the contact group, "ON" power switch. The switch should be replaced.
Panasonic TX-20S1TShassi MX-3

In the SECAM color system color is only part of the image
On
this chassis set chroma decoder SECAM TDA8395P (IC603). Control input
circuits revealed understated the scope of three-level pulse on the SCP
pin. 15 (0,8 In). They are formed by video processor AN5192-B (IC601).
This chip was defective
Philips 14GX37A

When you receive signals in SECAM system color image filled with red in the image of a normal PAL
Faulty
condenser built into the circuit frequency discriminator RY. Contour
L204 replaced. In case of difficulties with replacement can recommend
the following: vypayat circuit from it to break down the tube condenser,
set the path to the board and podborom external ceramic capacitor of 68
... 120 pF to set "zero" discriminator rude. The final configuration to
produce the rotation of the core coil.
Philips 21PT1342/58 "(chassis L6.1AA)


Violation of color. With increasing heating green component color
signal. White balance to normal, with heating DO NOT change. Defects
occur when receiving transmissions in the color system is PAL and SECAM.
When a signal nA low input (SCART, RGB) image of normal. With further
heating of the right-hand side of the screen fades red vertical stripe
width of about 5 cm And left this red stripe - sawtooth nA to this type of chassis used by the video processor TDA8362. Replacement chip delay line TDA4665 solved the problem.
Philips Chassis L01.2E Models: 14/17PT 266617PT166/0125/28PT 5107/0128/32 PW6006

Sound and high voltage is, there is no picture. Sometimes the image briefly poyavlyaetsya
Control
video pokazal their absence pin. 56-58 IC 7200 (TDA95xx). At the time
of disappearance of the image, it was observed that the first red color
disappears, then - the whole image. Ie, triggered circuit current
protection. Checking the video amplifier has identified a defective
transistor 7313 (BF423), at the touch of schupom oscilloscope image
sometimes poyavlyalos
Philips Chassis MD 1.2 EModeli: 21PT 4303/4422/450325PT 5302/5403/542328PT 4503/4513/452329PT 5302/9113

When you turn on the TV, he immediately goes into standby mode
On
this chassis all high-current components are controlled protection
scheme. Low level on the bus Standby-Protection translates IP in standby
mode. In this particular case it turned out that the faulty output
kskad correction circuit EW - transistor 7480 MTR3055 type (short)
SHARP-DV 5450

TV only works in the UHF
Faulty chip nonvolatile memory type 24C02S.The power supply is not working, the safety resistor R728 in the cliff
When
replacing a resistor R728 must be borne in mind that its nominal 3.3
ohms, it is impossible to put a resistor with less resistance, or will
break down other elements of the source. Due to the fact that this
scheme is an adequate supply of "whimsical", we recommend replacing
posle R728 before turning on the TV network vypayat of the board
transistor Q702 (F18006) and check whether the undistorted (rectangular)
pulses at the pin. 8 chip IC701 (TEM 1039). And just see this, set the
transistor Q702 in its place.
NA SONY chassis AE-1

When you turn the
machine tries to run, even there is a high voltage, then the power
supply is turned off, the LED nA front panel goes out One of the most probable causes - failure of the resistor R522 (100 k) - break. Such a defect is found in more devices.
SUPRA STV-in 2094 (Chassis C-50)

Languid, low contrast image as a broadcasting signal and OSD
When
the control supply voltage was found that for video amplifier podaetsya
300 V. This is due to capacity poterey S435 filtering capacitor (33 uF x
160). He podklyuchen to the pin. 7 (Bust) TDKS-FCM 2015ML. This problem
is typical for models with output ispolzuyuschih TDKS Bust.
Samsung CS-25M6MQCX/BWT "(chassis KS7A)

When the TV is not green, then the screen abruptly turns green. nA next
stage of the level of green gradually decreases until failure. The
entire cycle lasts 15-17 seconds, then repeat Image is constantly present, vce adjustment work. Marking nA Microcontroller: T-GRPEA-1016 04/07/20/4I/13 CHECKSUM: 6427. Trouble persists in the service mode. In the menu item Video Adjust 1,
the first six positions (G, B, R) Cutoff and (G, B, R) Drive had a
significant scatter. Setting the value of the above options in the "127"
correct.
Samsung CS1448R

At the moment the TV settings nA program, he switched to standby mode In this model, applied to the video processor type TDA9381. In this
instance the TV output circuit 36 ​​(input X-ray shielding) DO NOT use
(DO NOT connected). If you connect this output to ground through a
capacitor 47mkF 25 V, the fault is eliminated.
Samsung CW-29A8VHE "(chassis KS3A)

No picture and OSD The chassis holds nA chips SDA555XFL A14 (MCU), VDP3140D (video
processor), MSP3411G (audio processor). TV can be configured nA
television channels, there is sound. nA SCART video connector is
present. nA cathode TV tube voltage is 200 V. "culprit" of the defect
was the capacitor C407 (680 pF) - the breakdown (short circuit).
As a result, out of order elements C408 (4,7 nF) and R433 (5,6 ohm / 2
Watt). The image was absent due to the fact that the S407 removed from
the capacitor lower impulses reverse DO NOT received nA terminal 13 GPU
VDP3140D.
Schneider TV17

Net controls with remote control The reason was that the data has been changed (failed) non-volatile
memory. To remedy the defect, you must re "flash" the contents of the
memory chips. Televisions SAMSUNG nA chassis SCT11B (microprocessor - SZM-137M3) TV spontaneously switches to work with low input, DO NOT running a
local keyboard, sometimes spontaneously appears on-screen menu with the
"ruler" of the sound at times sovcem missing raster and sound
Replacement microcontroller and nonvolatile memory chips DO NOT have
changed nothing. Only detach from the output of a sensor microcontroller
gave a positive result. Photodetector has been replaced.
Sharp 14BN1A

TV does not work, the power supply defective
Control
showed the lack of start pulse line scan their forms video processor
IC801 (TDA8362), pin. 37. Checking mode chip Po postoyannomu current
pokazala that instead of 8 to pin. 36 (power generator row pulses),
there were 4 B. Defective diode D623 (8,2 V)
Sharp 70ES-14

"Pincushion" distortion of the raster After replacing the burned driver node distortion correction,
"east-west" Q506 (2SD2391) DO NOT regulated by the geometric distortion.
The reason for failure was a faulty diode D516 (BZT03C47, 47V, 3 Watt).
Checking his fault tester DO NOT identified. Check only need replacing.
This is a typical defect encountered repeatedly. 2SD2391 transistor
type has a European analogue BSR41.
Sharp 70GS-61S

At the top of the image nA darkest scenes we see two shimmering colored line flyback TV went to repair a faulty transistor and lowercase TDKS. After their
performance replacement vehicle recovered, but nA top of the image you
receive the defect. Replacing the video amplifier type TDA6107 DO NOT
solved the problem. Vertical in this model is made nA discrete elements.
Electrolytic capacitors checked replacement. The dimensions and
geometry of the raster in the norm. It turned out that the corrected
image to fine-tune the geometry of the screen, and in the service menu
to set certain options. To do this: - Enter the service menu (hold down the button, Vol + and Prog-nA front panel, turn the unit on the power button); - Set options Alter NVM PAG = 0C; - Set options Alter NVM POS = F7; - Set options Alter NVM VAL = 1A; - Press the Standby; - Reinstalling the option Alter NVM PAG = 0C; - Set options Alter NVM POS = EB; - Set options Alter NVM VAL = 10; - Click Standby. After that you must turn off and then turn on the TV network button.
After performing these adjustments in the service menu defect should be
removed.
Shivaki STV-2110M4

TV is not always included. If it still turns on, can work normally until the disconnect it from the network
It
is noticed that after some time of output voltage decreases by about
half. Checking and replacing "binding" IC STRS-6707 and the replacement
of the chip itself may have failed. The reason turned out to be
defective in optocouplers, through which the feedback voltage postupaet
with the secondary windings of pulse transformer driver circuit
comparison STRS-6707.
Shneider DTV-3

Dark vertical bands, especially noticeable in the left side of the screen Replacing the capacitor C3 (10 uF) inserted between terminals 1 and 3 chips VCU2136, to eliminate this defect.
Sony 25M1D "(chassis BE-3B)

Net images, sound and OSD are Malfunction caused by a lack of voltage 5 V nA tires ABL and EHT. These
tires are derived nA card connector "A". The reason - loss of a
resistor R829 (22 ohms).
Supra STV-2084DK "(chassis PC04A)

Lost
color in the color system SESAM, sometimes spontaneously TV in standby
mode. Malfunction "floating" and is dependent on the room temperature The cause of the defect was electrolytic capacitor S409 (0.22 uF) is
connected to terminal 5 chip TDA1940. Its capacity varies depending on
temperature and because of this withdrawal in July nA TDA1940 (signal
MUTE) instead of constant voltage 11 V pulse appears horizontal
frequency. The amplitude of these pulses also varied depending on the
temperature. With decreasing pulse amplitude lost color in SESAM (the
chain of D210, R229 MUTE signal output is fed nA 2 decoder SESAM AN5633
and violates his job). Further spurious pulses went nA pin. 1929
microcontroller PCA84C640P/30 and distorted signal IDENT. The
microcontroller then switches the TV into standby mode, as well as at
the end of television broadcasts. Replacing ceramic capacitor S409 nA of
the same value solved the problem.
Supra STV-2128MS, shassi C-50AN

Dim, low contrast image, raster narrowed Po horizontal, large nonlinearity Po vertical
In
the process of repair found that lowered output voltage. Faulty
capacitor in the feedback loop source S830 (1 uF x 160). This problem is
typical for TV sets, a power supply which ispolzuetsya STR50103A
controller type, for example, the model Daewoo DMQ-2157.
Thomson TX-807C

Net Vertical, horizontal band is shifted upwards by about 5 cm nA Replacement chip type TDA9302H problem DO NOT decided. Proved to be
defective SMD-resistor RV004, is connected to the findings 25 (Iref)
microcontroller TDA9554PS/N1/1/0301.
Vestel VR2985 TS "(chassis 11AK37-11)


Net images on-screen menu is. The signal from the video-DO NOT be
displayed. When you configure the program nA nA screen appears briefly
noise signal Faulty video processor type STV2248H.
Vityaz 37 CTV 6622M

TV can not be configured for a single program
povrezhdeny
data in nonvolatile memory. Should be in service mode in podmenyu
SELECTOR set the type of existing tuners, such as "Selteka KS-H-132"
There are two ways to enter the service mode:
- Standby TV posledovatelno press at the nominal RC (RC-5) M button - OK - Mute - ON;
- In working in TV mode, briefly shorted to a common wire checkpoint KT1 (located next to the microcontroller TDA9351).
To exit the service mode, press the button on the remote EXT.
Vityaz 37CTV 6623

When you turn on the TV image poyavlyaetsya and in 0,5 to disappear, the sound is
Check
pokazala that SSC gating pulse is normal, the power to the
microcontroller postupaet, video amplifier locked. Replacement chip
video amplifier (TDA6107Q / N) and diodes in its piping nothing gave.
Fault found in the device OTL - faulty transistor VT204 (BC837C).
Horizon 37SEM-664-IM Chassis 1911-AK36

TV turns itself off and then do not turn on, the fuse defective
The
controller power supply is realized on a chip IC841 (TDA3842AN). Chip
is powered 10 ... 15 V (vyv. 7). It turned out the voltage on the pin. 7
equal to zero. Check with an ohmmeter revealed a short circuit on a
common wire pin. 7. Proved to be defective diode D840 (15) - short
circuit
Horizon 63CTV-656-I 63CTV-656T-I

posle
break (10 ... 12 hours), TV did not immediately included in the
operating mode posle several popytok (switches back to standby mode).
Then during the day works steadily

The controller power
supply is realized on a chip DA800 (EKR1087EU1). Touching schupom
oscilloscope pin. 5 chips led to the launch source. Control external
elements chips did not reveal any defect items. posle replacement chip
TV turns on steady
Horizon 63CTV-664 (chassis 11AK20SE)

Sound and high voltage is, and the screen is missing
When
visual inspection revealed no glow podogrevatelya kinescope. Checking
the food chain podogrevatelya (6,3 V) with pomoschyu ohmmeter revealed a
defective resistor R925 - breakage
TVs with a microcontroller SDA555xxx (Samsung, chassis KS2A, Knight, etc.)

Initially,
spontaneous changes one of the parameters: saturation, volume, etc.
Then the TV stops responding to commands from the remote control or
front panel

Defect microcontroller SDA555xxx. Need to pay attention to the new version of the microcontroller (xxx) was the same
الرجوع الى أعلى الصفحة اذهب الى الأسفل
MSA
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عدد المساهمات : 542
تاريخ التسجيل : 16/06/2010

مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 2:30 pm

From the experience of repair: non-obvious failures TV





Hitachi CL2131TA (Chassis 2B-F90NN)
TV is not included in the operating mode
Turned out to be faulty line transformer M10-02 company NOKIA. Find a
transformer or its analogs (FAT30016, HR7230) has been difficult.
In the analysis of several concepts as an alternative was selected
transformer 154-277V/FCM20B022 (it is used in TVs PHILIPS,
RECOR, etc.).
Connection of output of this transformer c contacts the chassis repaired
the TV was done as c Table. 1.

Table 1
Contact chassisPin numbertransformer154-277VDesignationNumber
130 B12
Collector31
Impulse 260 in43
Housing57
Glow of the CRT6, 8-
OTL78
In the momentum -22695
Housing10The general conclusion
Potentiometer
FOCUS and SCREEN



Due to the lack of c Transformer isolated filament winding required for the TV, the second nA
rod transformer was wound an additional winding, consisting of three turns of wire installation.
Used in TV additional node TLF029/2033 c potentiometers FOCUS and SCREEN was unnecessary and was
dismantled, and the wires from the pots themselves transformer 154-277V were attached directly to the board with CRT.
After this replacement and adjustment potentiometers mentioned the TV was defective.
To add, chto rarely found TV model Hitachi CL2131TA performed in a similar way as the more well-known Nokia 7164VTEEBut some other notation c chips (see Table 2.).

Table 2
Hitachi CL2131TANokia 7164VTEE
HS44000RUMC44000D20
XC44140PB MC44140P
TDA4565 TDA4565V2
HEF4053BP CD4053BE
HS44131BP CD4053BE
TEA2264G TEA2164G
TDA4650 TDA4650V3
TDA4480 TDA3857

JVC C-21ZE BN3 (Chassis MZ2)
The TV did not screen and sound, and no indicator lights nA front
The audit revealed, chto all secondary power supply voltages were
reduced about 5 times. For example, instead of the standby voltage +11 V
was about 2 V.
The reason was a defect in the closure pin. 2 and 3, a sensor controller
chip IC741 (thus was shorted bus +5 V). After removing the receiver
circuit is normally earned.
Also, experimentally it was found that is in the power supply of the TV
instead of a transistor 2SD1853 (Q801), you can install a more powerful
and reliable 2SD362.


Philips 21CN4472/59R
After turning on the TV nebylo no raster, no sound
Measurements showed chto output voltage were significantly understated.
Turned out to be faulty chip output stage channel sound TDA1013B.
After replacing the chip image and sound are restored, but nA images
were horizontal lines, reverse blue-ray: a dozen lines in the top of the
screen and one - in the middle. Defect was corrected by replacing the
video processor TDA3565.
For reference - the scheme of this TV is close to the scheme Philips TV-Color 21CN4462 (The only difference is in the drive channel sound).


Sanyo CEM6022P-00
On the screen were observed slope and randomly moving bright white band
width of 1 ... 3 cm
Sound was normal.
When a remote command c in the middle bottom of the screen viewed the
green area (in all probability, this distorted signal OSD). Output
voltage corresponded to the norm, except in the channel 180, which was
lowered to +90 V.
Defective (dried) was S562 electrolytic capacitor (22 uF? 250) rectifier
power supply. After replacing the defective voltage capacitor nA +180
recovered and resumed normal operation of the TV.
The scheme of this rare television meets the chassis A3-CA nA which made
more famous models SEM2054-00 and SEM1454-00.


Sitronics STV2107F
Near the top of the screen there was no relation to the image of a
bright horizontal band width of about 3 mm
Replacement of deficient chips Vertical STV9362A nA common TDA9302Y
TDA8172A and gave no positive effect. Defect was corrected by shorting
each of the two ballast resistors - one in series c diode rectifier
feeding the chip field sweep and the second - is included between the
rectifier and the input power circuits.
Oscillograms of output voltage field sweep before and after the fault
are nA in Fig. 1a and 1b, respectively.
In the same television emerged another defect: in OS auditioning a sound
like crackling nA.
His culprit was one of two corrective magnets located nA conical
part of the OS. Crack was eliminated by setting the mounting location of
the magnet sound-absorbing pads from PVC pipe.
We present a list of chip sets this TV: LC863532C, ST24C08,
LC76810A-4HF7K, LA7642N, TDA1905, STV9362A, KA7812.


[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]

Sony KV-21K1 (Chassis G-3E)
TV spontaneously switched off after a few hours. When you turn sometimes
continued to work, and sometimes immediately switched to standby mode
Turned out to be faulty resistor R851 (Fig. 2). With its cliff-rays
increases the current CRT and fire protection along the chain of ABL
(OTL). Fault was detected when the oscilloscope removed c CRT board. In
this case, the breakage of the resistor TV remained in operation, chto
and helped diagnose the problem (in this case was lost the power supply
board CRT 200 B).


[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]

Sony KV-25C1R (Chassis AE-3D)
TV turns nA few seconds (to appear anode voltage nA CRT and sound),
after which the indicator LED blinks twice and the TV switched to
standby mode
Malfunction was caused by a violation of solder pin. 1 and 7 chip IC500
(STV9379) Vertical output stage.
This is a typical situation for the chip installed in the power
circuits.



JVC AV14TEIn the repair of TV did the following
defects. When you power the red standby light. Inclusion in the working
mode led to the fact that this indicator for a short while and then grad
starts flashing orange. With a few inclusions in the operating mode was
listed narrow horizontal stripe in the middle of the screen,
disappearing when the protection circuit. It was concluded that Vertical
Fault.Frame Scan this TV receiver is made on a chip-type IC401
LA7837. Control of human impulses start at the entrance chips (vyv. 2)
oscilloscope showed their presence at the TV to normal operation. The
output of this chip (vyv. 12) at this time there was no signal. The
supply voltage 8 and 25 V, respectively, on the pin. 1 and 8 were
normal. By visual inspection of quality soldering pins were discovered
ring cracks. After soldering these conclusions protection scheme ceased
to operate, but the image on the screen was strongly compressed
vertically (especially in the upper part, which also experienced an
image inversion).Replacement of D404 and C407 circuit
voltodobavki not led to solve the problem. It was decided to replace the
chip. After that, the TV is fully recovered.
Sony KV M2530KTelevision entered the repair with a
complaint about the lack of any reaction to the inclusion of nutrition.
Standby LED does not light up when you turn. And, when trying to switch
the TV from the power supply could not hear extraneous sounds (eg
clicks).It was assumed that broke down the power supply TV.Checking
the power transistor Q608 (2SD1548) ohmmeter showed its breakdown. The
fuse is not blown, but out of order (open) current-limiting resistors
R1603 (2,7 ohms, 7 watts) and R643 (0,12 Ohm, 2 W) in the emitter
circuit of transistor Q608. Resistors have been replaced, and the key
transistor removed. The television was turned on without the specified
transistor. When monitoring the oscilloscope trigger pulse were absent
in the base circuit Q608. After replacing the chip PWM regulator IC601
(TEA2260) trigger pulse appeared. After that was installed new
transistor 2SD1548, resulting in the TV was restored.
Daewoo 2595WFWhen you turn on the TV network is
triggered protection power supply against overload. Has been found
faulty transistor Q403 (2SD1888), standing in the line scan, and showed
signs of replacement. The client reported that this has already repaired
the TV in another workshop, and after repairs he spent no more than 30
minutes, after which the defect was repeated. It was assumed that the
transistor goes down because of the short-circuited turns in the line
transformer (TDKS).TDKS been tested at reduced supply voltage
(using an external power source). Reverse pulse shape was normal. Was
also tested in closed loop deflection system, it was defective. Was
installed defective transistor 2SC1888, but when the TV is quickly
heated to unacceptable temperatures. Impulse control run on the base of
the transistor Q403 showed that they form during heating strongly
distorted. Replacement of the matching transformer line scan T401 led to
that form of pulse start rebounded, and Q403 stop excessive heat. The
efficiency of the TV has been restored.
Hitachi Fujian 2014RTV went to repair the defect, as
expressed in the fact that during heating appeared strange sound - a
high-frequency whistle. According to the customer in diagnosing another
workshop was concluded on the need to replace TDKS.After removing
the back cover of the sound source was located - the sound was heard
from the mains transformer. Was demolished and purged the core of this
transformer and further tightened clamps. However, these actions have
not resulted in the elimination of the defect.[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]Fig. 1Measurement
of stress in the power supply (see the schema fragment in Fig. 1)
showed their deviation from the norm (decrease). When checking the power
supply has been found faulty capacitor S910 (loss of capacity).
Apparently, this was due to improper design of printed circuit board
(the condenser is located in the immediate vicinity of the sink
transistor Q901). After replacing the normal operation of this capacitor
TV recovered.
Hitachi Fujian HFS-2111RDefect manifested in the fact
that television reception was no sound. Since this model was gained some
experience, first of all, we measured the output voltage and the
voltage generated by line scanning. Voltage at the positive terminal of
the capacitor S762 (Fig. 2) at a rate of 14,5 was equal to 9 V. For this
reason, the output voltage stabilizer 12 (executed on elements of the
Q791, ZD791, D791, D792, C791, R791) was below normal (this voltage feed
circuit radio and video processor).[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]Fig. Two-2.jpgChanging
the filter capacitor S762 completely correct. The condenser is located
in close proximity to the radiator line scan output transistor Q701 and
the work is extremely hot. Therefore it was decided to install a new
capacitor from the conductors of the PCB.
LG CF-21I30KXTV on admission to the repair does not
turn on, standby LED does not light. Elements of DB801, R801, IC803 and
F801 power were intact. A more detailed inspection revealed the break
resistor R89 ​​(51 ohms, 2 watts). For this reason, the PWM, which is
part of IC803, not run. After replacing the resistor R89 ​​TV
performance was restored.
Mitsubishi CT-25AV1BDSTelevision reception there was no
image at normal sound. By visual inspection fees kinescope around the
findings of the panels and CRT video amplifier chip IC660 (TEA5101) were
detected circular crack. After soldering the findings of all elements
of CRT board defect has been eliminated.
Panasonic TC-29V2PXTelevision reception from the
antenna image has been colored, and when working with low input (DVD-or
VHS-sources) - black and white.Oscilloscope was controlled by a
signal generator on pin PAL subcarrier. 28 IC601 (TA8719AN). Due to his
absence, it was decided to replace the S622 capacitor (27 pF), and then
came the color image.
Sony KV-1485TV does not turn on, standby LED does not
light. 115 V and 15 V output power were normal. Was measured voltage
microcontroller IC001 (M343M) on pin. 52. It was absent, and the
resistance between the common wire and a specified output of the
microcontroller was about 10 ohms. The reason for closure was the
failure of the voltage regulator 5 V - IC IC005 (L78LR050).
Sony KV-2165In translating the TV operating mode is
activated protection of IP. Check output circuit PIs (Bus 115 and 15)
showed their lack of a short circuit. When the control circuit line
scanning, which form the voltage supply channel, was found faulty
resistor R853 (0,47 ohms). Breakage occurred as a result of resistor
diode breakdown D855 (RGP10G). After the replacement of defective items
operability TV has been restored.
Toshiba 2150REThere was no image at normal sound. The
anode and the focusing voltage CRT were normal (with increasing
accelerating voltage appears on the screen bright raster with flyback
lines).Signals R, G, B at the outputs of the video processor
M52707SP (vyv. 21-23) were the norm (magnitude of about 2 V at a
constant level, amounting to about 2,5 V). Video amplifier output
transistors Q901-Q903 were also intact. Cause of the malfunction was the
transistor Q971 (2SA9335), specifies the offset to the emitter of the
transistor Q901-Q903. This defect is quite common in other models of
television sets, video amplifier output which are collected in a similar
way.
Toshiba 29G3SHCWhen operating the TV sometime after the inclusion of distorted sound, until its complete disappearance.LF
input signals UMZCH (vyv. TA8211AN 2 and 4) were present. Normally, was
UMZCH voltage (26 V on pin 9).. Checking external elements UMZCH
revealed no faults. Replacement chip UMZCH allowed to eliminate the
defect.





Some useful recommendations for repair and adjustment of TVs


Method of setting up circuit flare
In view of c showing the increasingly wide-screen program offers a
convenient way to configure the RF predistortion correction circuit - flare
(BELL) TVs in the usual format.
When playing such a program loop regulate so chtoby interference in the
upper and lower dark parts of the matrix were minimal. A slight shift of
core tuning circuit in either direction from correct of noise appear and their intensity increases by more than more upset circuit.


Replacing the chassis of the TV Sony KV-M1400K after his fall
The chassis of this TV BE-2A was totally unsuitable for repair
(motherboard was destroyed), but at the same time an opportunity to
establish his place close to it on the circuitry of the chassis of the
TV KV-M2100K. However, the simple installation of new landing gear
failed, because these fees were not interchangeable.
Previously had to perform the following operations:
- Set nA new chassis line transformer and switch the mains, removed the broken landing gear c;
- Connect to new
Chassis cost CRT disconnected from a broken landing gear.
Line transformer and CRT board had to be replaced because of the
difference between c structure A34JBU70X CRT (in the TV KV-M1400K) and
A51JXH61X (in the TV KV-M2100K). chto regard switch the mains, we had to
keep old because of differences Frame.
Incidentally discovered unrelated c replacement chassis fault: c SCART
cable to reproduce only sound, but instead of the image nA screen were
visible horizontal black and white stripes (width of about 1 cm each).
Trouble was the connection is broken cathode zener D427 c bus +12 V
(Fig. 3). It should be noted, chto nA service schemes zener diodes D426
and D427 are shown as diodes, while nA actually - it zener. Restoration
of this compound provided the normal reproduction signal c connector
SCART.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]


On the verification and repair power TV Sony KV-29FX66K
TV made nA chassis AE-6B. When his inspection and repair should be
considered, chto minus bus channel 135 in tires and other channels minus
the power supply (+6, +11 and +33 V) is not connected to each board nA G
(it is located at the very source of supply), and nA combined boards A
and D.
Therefore, when checking card G (on channel 135 in) c is connected as a
load bulbs (40/60 Tues nA to 220 V), it flares up 2? 4 times, after
which the power supply goes into standby mode.
In this regard, c for the inclusion of off-board G nA need to connect it
to each other above freezing bus, for example, pin. 5, 6 connector
CN6005 c pin. 2, 4, 9 connector CN6006.
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مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 2:54 pm

Measurement of pulse voltage heater kinescope



Alexander Omelyanenko


At first glance, to measure the heater voltage of kinescope is not
necessary, but experience shows otherwise. The article addresses the
issues of measurement of pulse voltage heater kinescope and describes a
simple instrument.
In the process of repairing televisions are not accepted to pay
attention to the measurements in the food chain picture tube heaters,
except in cases of open, short, or when the need to increase the heater
voltage (to increase emissions in the "stranded" picture tubes). It may
seem that the problem of measuring the heater voltage of kinescope is
not particularly relevant, and in the measurement is not necessary. In
fact, everything is different.
Voltage is easily controlled with standard instrumentation for food
filament kinescope of mains transformer or constant voltage. Widespread
transition to a pulsed power heaters CRT (usually from the lower-case
transformers) spawned a series of problems, including those associated
with the measurement of voltage. Determine the real value of the voltage
of arbitrary shape is possible only with the help of specialized
instruments (eg, B3-48), measuring its effect, or rms, value (s.k.z.).
Such devices are called thermal voltmeters are rather complex and
expensive and not widely used, their availability and use of limited
financial capacity of repair shops. Measurements s.k.z. voltage with
standard multimeters incorrect, since the measurement results have
nothing to do with reality, and depend on the type and polarity of the
device. However, there are indirect methods for measuring the pulse
voltage picture tube heater, which was repeatedly described in
literature and periodicals.
Oscillographic method, proposed by some authors, is impractical and
requires subsequent calculations taking into account the pulse shape. In
one of the publications on this subject (see Radioamator № 4, 2001, p.
13), the author offers a way to "rapid assessments to measure the
current heater voltage. It uses the current method of measuring the
light amplitude and pulse width, assuming that Udeyst. Uo.h. = [0.29 +
0.01 (To.h - 12)]. According to calculations, the value of the pulse
amplitude at the time Uo.x reverse To.h = 11 ... 13 ms is approximately
22 V. However, such manipulation of the oscilloscope and a calculator is
not suitable for use in production or teleatele and accuracy of
measurement depends on subjective factors.
Using photos and thermocouples, calibrated according to the current
value of the dc, allows to obtain reliable values ​​of voltage, but does
not have wide distribution because of the complexity in manufacturing,
the need for thermal stabilization of the converter and the
linearization of the scale measuring device.
CRT heaters, with rare exceptions, supply voltage 6.3 V. This voltage as
a parameter is standard. Current consumption of the filament tube in
the practice of repair is not considered in the passport picture tube is
rarely indicated. When feeding the filament voltage source (Fig. 1)
Replacement of CRT is not necessary to upgrade and measurements in the
heating circuit. Another thing-pulse powered by a winding TDKS (Fig. 2).
Filament winding TDKS calculated based on the parameters used CRT and
line scan mode. Impulse voltage, taken from the transformer winding row
exceeds the nominal by 15 ... 35% by installing corrective ballast
elements (L or R) is reduced to the standard value. Using a pulsed
supply voltage source (Fig. 1) in the construction of TV is rare -
mostly in low-cost models. Much more widely used scheme, shown in Fig.
2. There are other ways of correcting the voltage heater. For example,
in some models of TVs from Sony instead of ballast resistor installed
diode (see Fig. 2) is included with the polarity of pulses coming from
the filament winding TDKS.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Fig. 1. Filament from the power transformer

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Fig. 2. Filament transformer from row
Consider a few real situations where there is a need to measure the
heater voltage kinescope. For example, in the TV to replace a failed CRT
heater with current consumption of 600 mA. With this new picture tube -
another manufacturer, but with the right parameters - may be the
current filament 300 mA at the same voltage. By reducing the current in
the filament voltage drop on the adjustment element (L or R) decreases,
which inevitably leads to increased stress on the findings of the
heater. The image is impossible to determine because brightness and
contrast visually correspond to the norm (they are stabilized by other
schemes TV). However, the picture tube with high voltage glow a short
time to lose the issue and will require replacement.
A similar situation may arise during the installation of reclaimed
kinescope. Plant producing replacement cathodes sets available cathodes
from another manufacturer with a standard voltage value, but not
current. In practice, the current consumption of the heater with respect
to the standard picture tube may have a bias in any direction. It is,
accordingly, changes the voltage at the heater, which entails raising
(or lowering) the temperature of the cathodes, the emission and,
consequently, premature failure of the kinescope.
Replacement of the failed TDKS - another reason that caused the
violation mode heater kinescope. For many TV sets have a universal
chassis manufacturer offers several types TDKS (including model and used
CRT) with different motochnymi data and, accordingly, different
voltages of secondary windings. Transformers differ on passport data,
but are identical in size and pinout. The latter allows to use them in
many models of TVs. Repair with replacement TDKS, at first glance,
completely restores the device. Sometimes it is necessary to adjust the
supply voltage line scan or raster size due to selection of capacitors
in the collector circuit output stage. However, the CRT filament voltage
with the nominal ballast device in the chain of the heater will be
significantly different from the standard value of 6.3 V and can be in
the range of 5 ... 9 V, which leads to the violation mode kinescope.
Described the situation (with the installation of tension "in the eye,
without the control of the heater voltage in the absence of the
instruments) are not uncommon, and the consequences are unpredictable.
In this task can help home-made probe pulse voltage heater.
To this end, the author developed a simple to manufacture and easy to
use meter pulse voltage heater kinescope. Its accuracy is superior to
indirect methods of measurement. Diagram of the device shown in Fig. 3.
He works on the same principle as the secondary power sources in the
circuits TDKS. The input voltage is rectified and charges a capacitor,
which as a load is connected turnout milliampermetr. Impulse voltage
across the capacitor goes to the bridge rectifier, which eliminates the
effect of reverse polarity. As the diodes are used, any low-power
silicon devices, such as KD103. Resistor R1 eliminates the need for
matching the characteristics of the diodes. Resistive divider R2, R3
need to harmonize and calibrate the pointer device. Resistor R3 -
trimmer, multi-turn. Capacitor C1 provides protection for the meter when
accidentally spilled its input DC voltage. Measuring head - of any
type, with a scale of 10 divisions and a current total deviation not
more than 10 mA. Meter can be assembled in any suitable housing with
surface mounting. As the input pins is convenient to use two crocodile
clips.


[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Fig. 3. Schematic diagram of the device

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Fig. 4. Scheme for calibration
Calibration assembled device is not complicated. In the absence of a
specialized measuring the actual value it can be done by working TV with
a pulse power heater and a homemade opto-coupler (Fig. 4) made of a
thin filament lamps 6 ... 12 V and a photodetector, for which you can
use any type of photoresistor. To calibrate the opto-coupler on the lamp
fed a constant voltage 6.3 V from a stabilized power supply. On a scale
of an ohmmeter connected to the photoresistor, determine and record the
resistance value of the last at a specified voltage. Indications are
the equivalent of an ohmmeter s.k.z. voltage applied to the bulb, which
in this case serves as an integrator, since the resistance of a tungsten
filament has a considerable inertia.
Then the lamp optocoupler connected to the conclusions of the standard
TV picture tube heater. Selection of resistance to the regular ballast
resistor in the circuit heater kinescope seeking recorded higher values
​​of resistance photoresistor. Typically, the voltage of kinescope
accurately set at the factory, but if necessary it can be adjusted by
varying the supply voltage line scan. After adjusting the values ​​of
the pulsed heater voltage to s.k.z. 6.3 V, the conclusions heater
connect the assembled probe. Resistor R3 sets the arrow on the unit
value corresponding s.k.z. 6.3 V, and fix the engine trimmer. At this
calibration meter ends.
In practice, it suffices to note on the scale measuring the value of 6.3
V and zone access. But you can mark and other values. It is convenient
to use small tape recorders with dual color LEDs scale, setting the
value 6.3 in at the junction of red and green sectors. In this case it
is necessary to calibrate the two marks (6.0 V and 6.6 V), which mark
the zone tolerance.
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مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 2:55 pm

Device for measuring the heater voltage of kinescope





In memory of Sasha (Alexandra)
The need to measure the heater voltage CRT does not arise often.
However, improper filament voltage can significantly shorten the life of
the most expensive part television.
Heater Meals CRT is usually taken from a separate winding of the
transformer and the row may change, for example, replacing the latter in
not the original, with adjustments or faults in the line scan or the
power supply, replacing the CRT.
The proposed device allows to measure the heater voltage with an
accuracy of about 0.5%. The principle of its operation is based on a
direct comparison between filament bulbs, plug it in turn to the picture
tube heater circuit, then to the reference voltage source.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]

The scheme consists of a multivibrator in the NE 555 chip, which is to
load a 12-volt relay. Multivibrator frequency around 12 Hz. Voltage
reference is made to the chip LM350T. Variable resistor, its voltage can
vary, roughly, 4 - 10 volts.
The device is powered from any source of voltage 10 - 12 volts.
Operation is simple. First, connect the glow, then energized, and
turning the potentiometer, seeking minimal ripple filament bulbs.
Voltmeter connected to terminals, displays filament voltage kinescope.
Current, selected by the device from the heating circuit kinescope about
10 mA. Light bulb - from highlighting the scale of radio. 12 V, 40 mA.
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مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 2:56 pm

The use of computer power supply to test FBT





Computer power supply consists of a device that can be widely applied in practice, not only remonta.I.
This article describes how to check flaybekov (TDKS) monitors and televisions with PSU computer format AT or ATX.
The author uses for AT PSU from the server. Its features include a
sufficiently large capacity, large capacity (820 uF) capacitor network
and, most importantly, reliable protection against overloads and short
circuits. Also, importantly, to get the voltage of 12 volt power supply
is used in a separate winding.
Thus, we reveal the PSU and print out the ends of the coil, which is
obtained by the voltage of 12 volts. Find it easy to be traced back to
the cathodes of the diode assembly which is the yellow wire from the
output connector BP.Kontsy winding connected to the anode of diodes, and
its mid-point - to ground. If the midpoint of the winding is connected
to pyativoltovomu rectifier, a power supply is better not to use, though
I have not tried.
Modified so BP is useful for many applications. Need two more lights
from car headlights. Can be burned-out filament beam. They are usually
thrown away. Use the driving lights (60 watts). Turn light bulbs in
parallel and load the 5-volt source.
Form napyazheniya on the findings of the winding is shown in waveform
# 1. Swing from the peak-to-peak - 130 volts, the period - 45
microseconds (22 kHz).
Serve this voltage on the collector winding flaybeka. Control the
shape of the signal on any of the secondary winding. In the waveforms # 2
and # 3 shows the forms of stress on the healthy flaybekah with an
inductance of about 1 mH (FEA 711) and 0.45 mH (47F13-0920S / CTX),
respectively. Note that in my practice have met several times flaybeki
from monitors CTX, which ended before the middle of vibration platforms.
So they are in the monitors were not working! On the waveform # 4
visible form of voltage flaybeke TFB-002 (S), the inductance of 1.3 mH,
which is included in series with coil inductance 0.27 mH.
Check flaybeka is as follows. If you suspect a problem with a diode
cascade sections, in series with the collector coil choke inductance mH
0.25-1. You can use another flaybek. Of course, defective. Leakage or
short circuit in a cascade of diode-section shape of the voltage on the
faulty flaybeke will be like shown in the waveform # 5. At the same time
on the series-connected coil form stress, as the waveform # 6. It
should be noted that the failure of such a diode cascade sections,
connecting directly to the collector winding flaybeka causes significant
heating coil, a few tens of seconds, which also serves as a sign of
malfunction flaybeka. Do not leave! Closed winding vylezut gut!
If everything seems intact, then connect directly to the collector
winding check violet spark length of about 8-mm gap between the suction
cup and the lower the winding-diode kakskadnoy section.
It is clear that the described test should be performed after checking:



  1. High voltage capacitor to the breakdown and loss of capacity.
  2. Windings on the circuit. This can be done by BP, but you can easily.


Energized with power supply to the winding with the number of turns
less than the collector, you can get a high voltage of about 25-30 kV,
and check insulation. Be careful!
Maybe missing something. Good luck in your work.


Ostsilogrammy:
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة][ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة][ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
1 2 3

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
4 5 6
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مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 2:56 pm

Replacement TDKS (FBT) in televisions and computer monitors

Quite often the situation arises where it is impossible to replace
the failed TDKS, because of difficulties with the acquisition of the
last of the required type. Often it is necessary to abandon the idea of
​​repairing the TV or monitor, when it became clear that the fault is
TDKS. In this paper, a particular example TDKS replacement of one type
to another monitor SAMSUNG, attempted to show how you can try to pick up
and install TDKS another brand, instead of the failed one.
Thus, the monitor is not included. When you try to enable heard the
characteristic sound of TDKS. The first thing to check serviceability of
the output transistor SL or (if CP split) HV converter. In this case,
the transistor is intact. Tested for reduction of capacity or leakage
(breakdown) high-voltage capacitor. With it turned out all right.
Checked for the presence of TDKS winding shorted turns. This is the
easiest way to make the device, representing a generator, induction coil
which is winding checked TDKS. Short circuit in the windings, at least
at a low voltage, not detected.
The transformer was tested by the method described by the author on the audit flaybekov (TDKS)
And is defined as defective. (Incidentally, it was a faulty waveform
Computer power supply consists of a device that can be widely applied in practice, not only remonta.I.
This article describes how to check flaybekov (TDKS) monitors and televisions with PSU computer format AT or ATX.
The author uses for AT PSU from the server. Its features include a
sufficiently large capacity, large capacity (820 uF) capacitor network
and, most importantly, reliable protection against overloads and short
circuits. Also, importantly, to get the voltage of 12 volt power supply
is used in a separate winding.
Thus, we reveal the PSU and print out the ends of the coil, which is
obtained by the voltage of 12 volts. Find it easy to be traced back to
the cathodes of the diode assembly which is the yellow wire from the
output connector BP.Kontsy winding connected to the anode of diodes, and
its mid-point - to ground. If the midpoint of the winding is connected
to pyativoltovomu rectifier, a power supply is better not to use, though
I have not tried.
Modified so BP is useful for many applications. Need two more lights
from car headlights. Can be burned-out filament beam. They are usually
thrown away. Use the driving lights (60 watts). Turn light bulbs in
parallel and load the 5-volt source.
Form napyazheniya on the findings of the winding is shown in waveform
# 1. Swing from the peak-to-peak - 130 volts, the period - 45
microseconds (22 kHz).
Serve this voltage on the collector winding flaybeka. Control the
shape of the signal on any of the secondary winding. In the waveforms # 2
and # 3 shows the forms of stress on the healthy flaybekah with an
inductance of about 1 mH (FEA 711) and 0.45 mH (47F13-0920S / CTX),
respectively. Note that in my practice have met several times flaybeki
from monitors CTX, which ended before the middle of vibration platforms.
So they are in the monitors were not working! On the waveform # 4
visible form of voltage flaybeke TFB-002 (S), the inductance of 1.3 mH,
which is included in series with coil inductance 0.27 mH.
Check flaybeka is as follows. If you suspect a problem with a diode
cascade sections, in series with the collector coil choke inductance mH
0.25-1. You can use another flaybek. Of course, defective. Leakage or
short circuit in a cascade of diode-section shape of the voltage on the
faulty flaybeke will be like shown in the waveform # 5. At the same time
on the series-connected coil form stress, as the waveform # 6. It
should be noted that the failure of such a diode cascade sections,
connecting directly to the collector winding flaybeka causes significant
heating coil, a few tens of seconds, which also serves as a sign of
malfunction flaybeka. Do not leave! Closed winding vylezut gut!
If everything seems intact, then connect directly to the collector
winding check violet spark length of about 8-mm gap between the suction
cup and the lower the winding-diode kakskadnoy section.
It is clear that the described test should be performed after checking:



  1. High voltage capacitor to the breakdown and loss of capacity.
  2. Windings on the circuit. This can be done by BP, but you can easily.


Energized with power supply to the winding with the number of turns
less than the collector, you can get a high voltage of about 25-30 kV,
and check insulation. Be careful!
Maybe missing something. Good luck in your work.


Ostsilogrammy:
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة][ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة][ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
1 2 3


[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
4 5 6

The use of computer power supply to test FBT





Computer power supply consists of a device that can be widely applied in practice, not only remonta.I.
This article describes how to check flaybekov (TDKS) monitors and televisions with PSU computer format AT or ATX.
The author uses for AT PSU from the server. Its features include a
sufficiently large capacity, large capacity (820 uF) capacitor network
and, most importantly, reliable protection against overloads and short
circuits. Also, importantly, to get the voltage of 12 volt power supply
is used in a separate winding.
Thus, we reveal the PSU and print out the ends of the coil, which is
obtained by the voltage of 12 volts. Find it easy to be traced back to
the cathodes of the diode assembly which is the yellow wire from the
output connector BP.Kontsy winding connected to the anode of diodes, and
its mid-point - to ground. If the midpoint of the winding is connected
to pyativoltovomu rectifier, a power supply is better not to use, though
I have not tried.
Modified so BP is useful for many applications. Need two more lights
from car headlights. Can be burned-out filament beam. They are usually
thrown away. Use the driving lights (60 watts). Turn light bulbs in
parallel and load the 5-volt source.
Form napyazheniya on the findings of the winding is shown in waveform
# 1. Swing from the peak-to-peak - 130 volts, the period - 45
microseconds (22 kHz).
Serve this voltage on the collector winding flaybeka. Control the
shape of the signal on any of the secondary winding. In the waveforms # 2
and # 3 shows the forms of stress on the healthy flaybekah with an
inductance of about 1 mH (FEA 711) and 0.45 mH (47F13-0920S / CTX),
respectively. Note that in my practice have met several times flaybeki
from monitors CTX, which ended before the middle of vibration platforms.
So they are in the monitors were not working! On the waveform # 4
visible form of voltage flaybeke TFB-002 (S), the inductance of 1.3 mH,
which is included in series with coil inductance 0.27 mH.
Check flaybeka is as follows. If you suspect a problem with a diode
cascade sections, in series with the collector coil choke inductance mH
0.25-1. You can use another flaybek. Of course, defective. Leakage or
short circuit in a cascade of diode-section shape of the voltage on the
faulty flaybeke will be like shown in the waveform # 5. At the same time
on the series-connected coil form stress, as the waveform # 6. It
should be noted that the failure of such a diode cascade sections,
connecting directly to the collector winding flaybeka causes significant
heating coil, a few tens of seconds, which also serves as a sign of
malfunction flaybeka. Do not leave! Closed winding vylezut gut!
If everything seems intact, then connect directly to the collector
winding check violet spark length of about 8-mm gap between the suction
cup and the lower the winding-diode kakskadnoy section.
It is clear that the described test should be performed after checking:



  1. High voltage capacitor to the breakdown and loss of capacity.
  2. Windings on the circuit. This can be done by BP, but you can easily.


Energized with power supply to the winding with the number of turns
less than the collector, you can get a high voltage of about 25-30 kV,
and check insulation. Be careful!
Maybe missing something. Good luck in your work.


Ostsilogrammy:
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة][ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة][ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
1 2 3


[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة] [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
4 5 6

So, you must now determine which windings are TDKS have to be replaced, and their parameters.
Best of all, if there is a scheme monitor (TV). In this case, the
scheme was not, but this was TDKS listed company HR. Once there is a HR,
so there is the scheme! Fig. 1. Thus, as the scheme is, you do not need
prozvanivat winding and climbing on board monitor, determining which of
these rectifiers are fed from the windings, and how they can still be
used! Further, the measured inductance of the windings (shown in the
figure). After this, attempts to find out available TDKSov suitable.
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Fig. 1

The most suitable Candidates for the replacement was TDKS type FEA
711, it is not known from any monitor (presumably, TATUNG). Its primary
winding has okazalasos, the same iduktivnost. The secondary winding was
alone with three taps. We first identified the ends of the coil, the
maximum inductance, and then, all the rest (see Fig. 2). Used part of
the winding, with approximately the desired inductance. To obtain the
voltage on the 5-th output of "native" TDKSa on sedechnik FEA 711 were
domotany three turns of wire assembly, as shown in Figure 3. The voltage
on the accelerating electrode of the kinescope (G2) was filed with the
regulator, available on FEA 711, ie, circuit connected to pin 3 "native"
TDKSa, was not used. For installation on board, had to drill three
additional holes.
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Fig. 2

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Fig. 3

Maybe this experience will be useful in the selection of transformers in monitors and televisions.
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مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 3:02 pm

How does the line scan



If you understand everything, then you do not have all the say.



Duty cycle.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Let us briefly consider the duty cycle line scan. A simplified scheme of the output stage line scan is shown in Fig.1.

In this scheme, is formed linearly changing current in the deflection
coils. Consider the process convenient, since the second half of the
direct approach.

Here is the sequence of phases:

  1. By the base of the transistor is applied a
    positive potential. In the base circuit current begins to flow, opening
    the transistor. Voltage between the collector and emitter of about 0.5
    volts. Consequently, the coil Lc applied full power supply voltage U.
  2. According to the property of inductance,
    described by U = LdI / dt, the coil nachninaet flow ramp current. This
    current flows through the chain to-E of the transistor.
  3. At the end of direct move will make to the
    transistor base closing potential. On the base circuit starts leaking
    negative closing time tok.Spustya Tstg, the transistor closes, and the
    collector current begins to decrease.
  4. The current in the inductor can not change
    instantaneously, as well as the transistor is closed and the diode
    reverse bias, the current can flow only through the capacitor, charging
    it. Since the capacitor in parallel transistor, the collector voltage of
    the transistor also increases. The energy of the magnetic field coil
    perhodit in electric field energy of the capacitor. When the voltage on
    the capacitor reaches a maximum, the current falls to zero (the phase
    shift between current and voltage 90 °).
  5. Further, the voltage on kondesatore begins
    to fall, and the current in the coil increases. This, in fact, the
    resonant LC circuit in which energy passes from the condenser coil and
    vice versa. Note that by the end of the flyback, the current in the coil
    flows in the opposite direction, compared to what it was before. This
    is - a negative current. It may be noted that in this phase of the form
    of voltage and current sinusoidal.
  6. This oscillating process would have
    continued, and the capacitor voltage fell to a sinusoid, if not the
    diode. Once the capacitor voltage reverses polarity, the diode is
    shifted forward. Current in the coil, as mentioned above, can not change
    instantaneously. While he will proceed in a negative direction and
    reaches zero, the diode is open. Thus, the coil is applied about the
    same voltage across the diode is open, as it was at an open transistor,
    ie, (U). We note again that the coil current is now flowing through the
    diode.
  7. Thus, the current in the coil again varies
    linearly with the same slope. This current begins to decrease with the
    same magnitude (in absolute value), which was before the closing of the
    transistor (without loss). However, he proceeds in the opposite
    (negative) direction.
  8. Before the current in the coil will be equal
    to zero, open the base shift again goes to the transistor. This means
    that when the current in the coil actually drops to zero, the state of
    the circuit will be the same as in the beginning, described in paragraph
    1, ie the current is zero, the transistor is open and the coil applied
    voltage U.

On Fig.2 shows the shape of the current in the deflection coil and the collector voltage of transistor row (NTOs).
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Define the estimated order of magnitude of the currents and voltages in
the circuit.
We assume the supply voltage, U = 115 volts, the inductance, L = 1.4mGn,
time reversal, Tfb = 14mksek. Time direct move, Tscan = 64-14 =
50mksek.
Then, the capacitance is determined from the ratio of T = 6.28 sqrt
(LC), where T = 2 Tfb.
[color:8906=#a00]C = 4 Tfb ^ 2 / 6.28 ^ 2 L = 14.2 nF.

Current in the coil to the end of the straight course will be determined from the relation U = LI / (Tscan / 2).
[color:8906=#a00]I = U Tscan / 2 L = 2.05 A

Amlituda capacitor voltage is determined from the equality of the
energies of magnetic and electric fields LI ^ 2 / 2 = CU ^ 2 / 2.
[color:8906=#a00]U = sqrt (L I ^ 2 / C) = 645 V.

S-correction.

The actual line scanning scheme is somewhat different from the above, to
compensate for image distortion arising from the deflection current is
strictly a sawtooth.
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Consistently with a small deflection coil includes capacitor Cs. See Fig.3.
Power to the circuit moves through a large choke inductance. Capacitor
charged to voltage. In a real circuit performs the role of the throttle
collector winding flaybeka. If the capacitor is very large, then during
the course of the direct line scan voltage across it, in practice, will
not change. This voltage is the voltage applied to the horizontal coil.
So, the shape of the deflection current is a sawtooth, as described
above.
If, however, choose the capacity of the condenser such that its
capacitance was comparable with the resistance line-otklonyayuscheny
coil at the operating frequency, the deflection current is the first
harmonic sinusoidal increase. Superimposed on the saw, sine give
oklonyayuschemu current S-shape, which compensates for distortion of the
scan, typical CRT with a flattened or flat-screen TVs.
Due to partial compensation of inductive reactance capacitive current in
the deflection coil will increase, which will increase the size of the
horizontal. In this case, however, will increase momentum and reverse,
leading to increased stress on the second anode of CRT.
At the beginning of the direct current will have the same amount as at
the end of the straight, only to proceed in the opposite direction. From
the beginning of the course and to direct its middle, the capacitor
will be recharged through an open diode, and the second half -
discharged through the transistor. See Fig.4.
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Here are the relative values ​​of the deflection current and pulse
reverse, depending on the size of the capacitor, removed experimentally.

C, uF Impulse OX Deflection current
311
0.321.051.2
0.191.11.4

As can be seen, if necessary, can increase the size horizontally,
slightly reducing the capacitor S-correction (sacrificing geometry).
Generally, the capacitance of the capacitor is very critical.

Linearity control.

Deflection coil inductance but also has a resistance, which leads to
asymmetric distortions, consisting in compressing images, from left to
right, as current increases exponentially, rather than saw.
To compensate for this series with the deflection coil is linear
controller, representing a coil on a ferromagnetic core, the inductance
is much smaller inductance row deflection coils, the magnetic circuit is
the magnetizing current deflection. Near (or on the magnetic core) is a
permanent magnet. Linear regulator is included in the circuit and the
polarity such that, during the first half of the direct move magitnoe
field deflects the current offset the effect of the magnet, and the
linearity of the inductance of the regulator is maximal, and during the
second half of the direct current magnetic field and magnet acted on. In
this case, the core part of the saturation and the inductance of the
regulator is minimal.
Thus, at the beginning of the deflection of direct current is reduced more than the end, to compensate for distortion.

EW correction (correction of pincushion distortion).

Measures described above, allowed to correct the distortion tolerance of
one line. However, if you scan the entire frame length of the string in
the middle of the frame has a minimum length, increasing the rows in
the directions up and down.
Hence, for strings of equal length, the magnetic field deflection coils
must be greater than for lines in the middle frame, decreasing in
magnitude for lines located above and below. Usually, this is achieved
by modulation of the voltage applied to lowercase deflection coil, a
voltage of a parabolic shape framerate.
Because of the winding flaybeka obtained many stresses, including for
the second anode voltage of kinescope, focus, Vertical, etc., should
arrange for adjusting the voltage applied to the deflection coil, so
that the voltage across the primary winding flaybeka unchanged.
Modulate, for example, supply voltage flaybeka not.
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
In the scheme, called a diode modulator (Fig.5), Solves the
problem of adjusting the voltage applied to the lowercase deflection
coil without changing the voltage on the primary winding flaybeka.
In this scheme, consistent with the lower deflection coil, the coil
turns of the modulator. Instead of one diode in series two diodes and a
resonant capacitor also consists of two series-connected capacitors.
Both circuit tuned to one frequency of the flyback. Lower diode
modulator is shunted condenser, whose capacity is greater than the
capacitance shunting the upper diode, about four times. Accordingly,
modulating the inductance coil inductance is less than the deflection
coils in the same number of times. Smod capacitor connected in series
with the modulating coil is not used for purposes of S-correction, so
its capacity can be large enough to move forward during the voltage
across it remained practically unchanged.
This capacitor is charged to the average voltage on the ground through
the diode modulator coil. The voltage between the capacitors connected
in parallel diodes share is inversely proportional to their capacity.
Hence, the average voltage on the capacitor is lower, the supply voltage
115 volts, will be 115 / 5 = 23volta.
Consequently, the voltage on the capacitor S-correction will not be 115
volts and 115 - 23 = 92 volts. Thus, during the direct run to lowercase
coils will be enclosed low voltage and line size decreases. By adjusting
the voltage on the modulating capacitor, resizable horizontally, and
varying the voltage across it by the law of personnel of the parabola,
you can adjust the pincushion (EW) distortion.
To the primary winding flaybeka same during the forward run makes all
the power supply, and during the reverse - reverse the momentum, equal
to the sum of the pulses on both capacitors, ie, - The entire scale.
Thus, the voltage received from the secondary windings and high voltage
(HV) remain unchanged.
If time allows, the second part we consider the driver circuit base,
Waveform-based MUSIC, schemes and options, can anything else.
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مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 3:08 pm

Chapter 3. LCD TVs OPERA, MIYOTA, PHANTOM

Chassis: HT700-01

Specifications

Main specifications TV, made on chassis HT700-01, are shown in Table 3.1.

Table 3.1. Main specifications TV

CharacterizationDescription
Color Systems PAL / SECAM / NTSC
Sound system B / G, D / K, M, I
Receivable channels VHF / UHF, CATV / HYPER
Type of LCD panel Color Active Matrix TFT-LCD
Brightness 250-300 cd / m2
Contrast 150:1
Tuner Analog type, with automatic tuning and preset 255 channels
Interfaces AV-IN/OUT, type connectors JACK
Power supply - AC / DC Adaptor 220/12 V - car battery
Power consumption 10 W
TVs have a traditional design: plastic case, which hosts the LCD
panel, the main chassis board (Fig. 3.1), antenna, front-panel buttons,
the dynamic head, connectors LF input-output, antenna and headphones.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]

Fig. 3.1. Wiring diagram of the main board HT700-01

Circuit diagram

Basic electric
circuit television is shown in Fig. 3.2. The basis of the chassis - chip companies SANYO. This - the microcontroller LC863324
(IC13) and a multi-chip (PCHI tracts,
PCHZ,-Video, FM-demodulator, sinhroprotsessor,
chroma signal decoders PAL / NTSC)
LA76810 (IC11). Decoder
SECAM signals implemented on the chip LA7642 (IC12).

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
As an interface between
LA76810 video processor and LCD panel used
specialized chip firms SHARP IR3Y26A (IC1).

Power supply TV
powered with 12 V of AC / DC-adapter (see
Table 3.1). It forms a stable galvanic isolated from the network
dc voltages to power all the nodes TVs. It consists of two
nodes: a single-cycle pulse converter based on PWM controller LA7610 (IC6), the control force
Key A829 (Q11), and
push-pull oscillator on the elements Q14, Q15, which is fed from the backlight on the LCD panel -
Fluorescent Lamp Cold Cathode (CCFL).

Let us consider in more detail the fundamental circuitry.

Radio channel

The TV signal arrives at the antenna input analog
Tuner TU1 (TDQ-3CV1). Tuner control microcontroller IC13.
Signals to select a range of pin. 1, 41 and 42 MK come to pins 05/03
tuner. RF AGC voltage is generated corresponding to the scheme in the
IC11 chip and pin her. 4 is applied to pin 1
tuner. Voltage settings for the tuner (0 ... 33 V) is formed by the scheme in
transistor Q6 of the voltage 33 V, which
generated power source. The scheme operated by 14-bit
pulse-width modulator (PWM) in the microcontroller (its output VT - pin. Cool. The digital part of the tuner is powered 5 V (pin
6) from the power source.

IF signal from pin 7
Tuner TU1 through a preamplifier to
transistor Q4 and a bandpass filter CF1
(CF38.0) arrives at a differential input IFA (vyv.
5, 6, IS11). Further processing of TV signal
by multi-functional chip LA76810.

LA76810 IC performs the following functions:

- Strengthening and demodulating IF signals of image and sound;

- Processing of luminance;

- Selection and decoding, color systems PAL / NTSC (delay line luminance and chrominance are built into the video processor);

- Adjust brightness, contrast, saturation and hue;

- Switching video sources;

- Formation of sync (SI) for the frame and line scans.

Pin assignment chip LA76810 is given in Table 3.2.

Table 3.2. Pin assignment chip LA76810

Pin number Signal Description
1 AUDIO OUT Sound output
2 FM OUT Exit FM-demodulator, an audio signal
3 PIF AGS External capacitor circuits tract IF AGC
4 RF AGS Output signal RF AGC for Tuner
5 VIF IN1 Output of sawtooth pulses Vertical
6 VIF IN2 Log in feedback Vertical
7 GND (IF) "Earth" tract IF
8 VCC (VIF) Supply voltage 5 V
9 FM FIL Filter FM-demodulator
10 AFT OUT AFC output signal
11 DATA Data Bus Interface I2C
12 CLOCK Synchronization bus I2C interface
13 ABL Input circuit current limiting ray
14 R IN Inputs for external video signal RGB (OSD video signals are fed from the microcontroller)
15 G INInputs for external video signal RGB (OSD video signals are fed from the microcontroller)
16 B INInputs for external video signal RGB (OSD video signals are fed from the microcontroller)
17 BLANK IN RGB signal input extinction
18 VCC (RGB) Power supply 8
19 R OUT Outputs RGB video
20 G OUTOutputs RGB video
21 B OUTOutputs RGB video
22 SD Output detector (to identify the reception PTSTS)
23 V OUT Output of human SR
24 RAMP AFC FIL Filter sawtooth generator (FPG), Vertical
25 VCC (H) Voltage of the master oscillator line scan 8 (Icons.= 12 ... 16 mA)
26 H AFC FIL AFC filter line scan
27 H OUT Output pulse start line scan
28 FBP IN Log SIOH line scan
29 VCO IREF External resistor of the reference source for the voltage-controlled oscillator (VCO)
30 CLOCK OUT Output reference frequency 4.286 MHz for SECAM decoder
31 VCC (CCD) Supply voltage 5 V
32 CCD FIL Filter integrated delay line
33 GND (CCD / H) "Earth"
34 SECAM B-Y IN Inputs for chroma signal SECAM BY / RY
35 SECAM R-Y INInputs for chroma signal SECAM BY / RY
36 APC2 FIL Filter circuits FAPCH2
37 FSC OUT Output detector color system
38 XTAL Quartz resonator 4.43 MHz color channel
39 APC1 FIL Filter circuits FAPCH1
40 SEL VIDEO OUT Composite video decoder SECAM
41 GND (V / C / D) "Earth"
42 EXT VIDEO OUT Composite video output for low
43 VCC (V / C / D) Supply voltage 5 V
44 INT VIDEO IN Composite Video Input (for internal PTSTS)
45 BLK STRETCH FIL Filter schemes to enhance the black level
46 VIDEO OUT Composite video
47 APC FIL Filter color scheme
48 VCO COIL Terminal on the support contour-Video
49 VCO COILTerminal on the support contour-Video
50 VCO FIL Filter VCO
51 EXT A IN Input of external audio signal
52 SIF OUT IF output audio signal
53 SIF APC FIL Filter sound channel IF
54 SIF IN Exit FM-demodulator, an audio signal

After amplification and demodulation PTSTC
removed from the pin. IC11 46 and the input of the
video switch "inside / outside" - pin. 44 IC11.
The second input switch (vyv. 42) through an analog multiplexer IC10 served external video signals V1
and V2 Connector PS2.
The multiplexer is controlled pin. 1939 microcontroller IC13.
Selected video image is processed in the channels of luminance and chrominance
GPU IC11 and is output circuits -
pin. 19-21, and here - in the interface the LCD panel, chip IC1
(IR3Y26A).

If the signal is received
color system SECAM, it is treated outside
decoder on a chip IC12 (LA7642).
To work on the chips it serves the following signals:

- PTSTS on the pin. IC12 to pin 14. 40 IC11;

- SSC gating pulses to the pin. IC12 to pin 10. 28 IC11;

- 4.43 MHz reference frequency
from the PLL demodulator for pin. 11 IS12 with the pin. 37 IC11 (a follower transistor, Q2);

- The reference frequency for
adjust filter bottoms "4.286 MHz on pin. 9 IC12 with
pin. 30 IC11;

- Select signal on pin SECAM systems. IC12 to pin 12. 37 IC11 (high potential, more than 3 B).

The output of integrated circuits (vyv. 6
and 7 IC12) removed color difference signals RY, BY and fed to video processor - pin. 34 and 35 of IC11.

Rated voltage
supply of IC 12 (vyv. 15) - 7,5 ... 8,
Current consumption is 35 ... 40 mA.

The structure of chips IC11 is sinhroprotsessor generating lower and
SI staff to synchronize the corresponding sites of the TV. These signals
used to synchronize the chip interface LCD panel IC1. Lowercase SI removed from the pin. 27 IC11
and through an inverter on the transistor Q3 to the inputs
circuits IC2 and IC3.

Node on a chip IC2 (4 items 2, NO-structure CMOS) outputs a
(Pin 10) the feedback signal for the normal functioning of the PLL in
of chip IC11 (simulates the operation of
line scan CRT TV). This signal is fed to the pin. 28 IC11.

Staffing SI (vyv. 23 IC11) via an inverter on the transistor Q19
and from the chip IC2 (input - pin. 12
output - pin. 11) arrive at the pin. 20 IC13 for personnel
Synchronization of screen menu.

The second node on a chip IC3 of human SR (supplied with the pin. 23 IC11)
and lower SI produces two clock:

- Line-frequency signal,
removed from the pin. IC3 1910 and served on a pin. 21 IC13 for horizontal sync images OSD;

- Composite sync
(CSI + SSI), is removed from the pin. IC3 in 1911 and served for
synchronization interface LCD panel to the pin. 2 IC1.

Audio signal is also
processed chip IC11. The output signal path
the input of the switch "inside / outside" (included in this
IC). The second input switch (vyv. 51) sounds a tone with
Bass input jack PS2. User selected sound
signal is fed to the adjustable amplifier, and with it - to pin. A chip.
here - in the input audio amplifier - pin. 3 IC201
(SC386 - analog LM386). This
chip on an 8 ohm load develops a power output of 0.3 watts, works in
voltage range 5 ... 18 V and has a quiescent current of 4 mA. Output
removed from the pin. 5 IC201, and through the separation
Capacitor S63 connector and JK3, fed to the headphones
or through a connector S8/S4 - on
dynamic head.

IC UMZCH feeds
+12 V (vyv. 6) from the power source.
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مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 3:11 pm

Interface LCD panel
As an interface, use of IC1-type IR3Y26 firm SHARP - Video processor
with analog input for connecting TFT LCD-panel with an analog interface.
As part of IC includes a voltage regulator, sinhroselektor, 2-input
signals switch RGB, three video amplifier with adjustable gain, black
level fixing scheme in the output signals and the scheme of the
gamma-correction. Inputs chips - RGB-signals on pin. 9, 8, 6, and
composite video on the pin. 2 (in this chassis it is fed composite
sync), and output - RGB-signals on the pin. 29, 32, 35, and sync to the
pin. 46, 48. The device has analog inputs (voltage control) to adjust
the picture settings (vyv. 3, 5, 38-43), but they are not used due to
the fact that all adjustments are performed in the video processor chip
IC11. Control commands are fed from the microcontroller IC13 of digital
bus I2C.
Integrated circuit IC1 is fed from the power supply voltage of 5 V (vyv. 10) and 7,5 (vyv. 34).
Depending on the type of LCD panel, it connects to the main
motherboard via a 24 - or 30-pin connector (S3 and S2 in Fig. 2). In addition to RGB video
for the panel needed service signals, timing signals and
supply voltages. Utilities signals are formed microcontroller IC13 - it signals L / R (vyv. 36), U / D
(Vyv. 35). They are served on pins 15 and 16 slots S3
(And on the contacts 23, 22 S2 for another type of panel).
Clock signals generated chip IC1 (see description
IR3Y26) and fed to the terminals S2 and S3. Supply voltages 17 and
-15 V shaped pulse source and through the contacts 4, 5, S1 supplied to the LCD panel.



Microcontroller

On this chassis used
microcontroller type SANYO LC863324A (IS13). It is implemented on an 8-bit
nucleus and has a 24 KB ROM and 512 bytes of RAM. In its structure there are all
the building blocks of a television controller: generator (system, display
and quartz, the frequency of 32.768 kHz) circuit interrupts, timers, ports
I / O, PWM, comparator, oscillator-screen menu interface, I2C. The program, written
a ROM chip, provides a service adjusting the TV to the stage of
production or after repair.

Functioning
microcontroller provides reset circuit (elements ZD2,
Q1, C11) and volatile
Memory IC9 (24S04). The microcontroller is powered
5 V (vyv. 12) from the regulator IC4 (78L05). In this case, current consumption is in operation
30 mA and in standby - less than 1mA. Pin assignment of the microcontroller is given
in Table 3.3.

Table 3.3. Pin assignment of the microcontroller LC863324A

Pin number Designation Type(I - Input, O - output) Description
1 UHF O UHF signal range selection
2 50/60 O Not used
3 PZOOM1 I / ONot used
4 PZOOM2 I / ONot used
5 VOLUME-L I / ONot used
6 VOLUME-R I / ONot used
7 POWER O Control signal power supply (high level - inclusion)
8 VT O 14-bit PWM signal frequency tuning tuner
9 GND - "Earth"
10 XTAL1 I Log in 32.768 kHz quartz oscillator
11 XTAL2 O Oscillator output 32.768 kHz
12 VDD - Supply voltage 5 V
13 KEY-IN I / O ADC input for the matrix control panel
14 AFT-IN I / O Input for APCHG
15 NC I / O Not used
16 NC I / ONot used
17 RESET I Input reset signal (low level - active)
18 FILT - Filter PLL
19 CHROMA
SECAM
I Control input signal receiving SECAM (low - SECAM)
20 V. SYNC I Log in human SI
21 H. SYNC I Log in lowercase SI
22 R. OUT Output RGB-signals OSD
23 G. OUT Output RGB-signals OSD
24 B. OUT Output RGB-signals OSD
25 OSD-BAK Signal output blanking RGB OSD
26 I Not used
27 SDA0 I / O Interface I2C 0 (control EEPROM)
28 SCL0 OInterface I2C 0 (control EEPROM)
29 SDA1 I / O Interface I2C 1 (control IC11)
30 SCL1 OInterface I2C 1 (control IC11)
31 SAFTY I Not used
32 S-VHS Not used
33 SD I Log in identifying the reception PTSTS
34 REM-IN I Input signal from a sensor control commands
35 U / D O Timing signals for LCD panel
36 L / R OTiming signals for LCD panel
37 MUTE O Not used
38 AV1 ONot used
39 AV2 ONot used
40 LNA ONot used
41 V-H Signal range selection MD2
42 V-L Signal range selection MB1



Power supply

The power supply generates
stabilized voltage 33, 17, 12, 7, 5 and -15 required for
all sites in the TV. In addition there is also the main source of DC / AC converter to power the backlight, the LCD panel. He
forms of DC 12 V AC 400 ... 450 V
load current 4 ... 6 mA.

Source is powered by AC / DC-adapter 220/12 B and a DC / DC-converter, built on the basis of the PWM controller type 7610
(IC6). Circuit operates over a wide range of supply
stress (3,6 ... 32 V) and clock (5 ... 350 kHz), has a totem output
management of external bipolar transistor. Assigning pins
given in tablitse3.4.

Table 3.4. Assigning pins 7610

Pin number Designation Description
1 IN- Inverse amplifier input of the error signal
2 F.B Log in feedback / amplifier output signal errors
3 GND Total
4 OUT Output control signal
5 V + Supply voltage 12 V
6 CS Control input circuit soft-start and short circuit protection
7 CT External elements of the master oscillator
8 REF Reference voltage output 2,5 V

In the chip is implemented
Current management principle, which is called "run of the timer» (turn-on
with clock). This means that the transistor switch turns the signal from the
internal oscillator, and switched off the signals feedback - with
divider R72 VR1 R30, connected to the secondary voltage of 5 V is removed
voltage feedback through the chain of C94 R132 R53 C151
the input of the feedback - vyv.2 IC6. When
indicated on the diagram denominations vremyazadayuschih elements C44
(2200 pF) and R13 (33 ohm) operating frequency circuits
approximately 60 kHz. Output parameters chips following: (vyv. 4) -
UOL= 4, UOH= 0.25 V, ISOURSE= 11 mA (RL= 100 ohms). Voltage
Power converter 12 is fed to him through the transistor Q16 Q17, a control signal from the pin.
7 microcontroller IC13 (high capacity - food
included). With the secondary windings of the transformer T4
shot pulse voltage through the rectifier and
filter circuit are fed into the load.

DC / AC converter to power the backlight the LCD panel is designed to
push-pull oscillator circuit on the elements Q14, Q15, T2. As the primary source, he
powered 12-volt AC adapter through the key Q16
Q17. Operating frequency converter is determined
inductance of primary windings of transformer T2, the parameters of transistors Q16, Q17, and is about 50 kHz.
AC voltage is removed from the secondary winding of the transformer T2 and a
dividing capacitors C7, C8 and connectors S7 and S9 is supplied to the electroluminescent backlight, placed
directly on the LCD panel.



Service mode

Turn on the TV at work
mode and the remote control close the pin. 2 and 14 chips to each other. The screen should
A message «FACTORY» or «F». If the service
mode is not included, instead of pin. 14 close the pin. 2 to 13, 15 or 16. References
sub-menu service mode is shown in Table 3.5. To switch between
submenu, use the MENU button on the remote. Management in
these sub-menu - by pressing the P + / - and V + / - on the remote. To exit the service
menu, close the pin. 2 and 14 chip RC or click in the submenu LANGUAGE OPTION
click MENU. Parameters for all sub menus and their values,
installed in a particular TV model, are presented in Tables 3.5-3.13.

Table 3.5. List of sub-menu service mode

Name of the sub-menu
1. SIGNAL
2. BALANCE
3. GEOMETRY
4. ANALOG DATA
5. PICTURE
6. LOGO SETTING
7. SYSTEM
8. FACTORY OPTION
9. LANGUAGE OPTION




Table 3.6. Options submenu SIGNAL

Parameter Value
S.R-Y 7
S.B-Y 8
RF AGC 58
VCO 63
S. CNT 8
RGB-C 50
IF-FREQ 38.00
ABL GN 2
ABL SP 2
MANU. AFT OFF
AUTO. AFT OFF



Table 3.7. Options submenu BALANCE

Parameter Value
R. CUT 95
G. CUT 109
B. CUT 102
G. DRV 80
B. DRV 80



Table 3.8. Options submenu GEOMETRY

Parameter Value PAL NTSC
H. POS 14 15
V. POS 5 4
V. SIZE 38 37
V. LINE 13 12
V.S COR 11 10



Table 3.9. Options submenu ANALOG DATA

Parameter Value PAL NTSC SECAM
CONTRAST 0 63
BRIGHT 0 85
COLOR 0 63
SHARP 0 73 127
TINT 0 73 127



Table 3.10. Options submenu PICTURE

Parameter Value
CONTRAST 50
BRIGHT 50
COLOR 50
SHARP 50
TINT 50



Table 3.11. Options submenu LOGO SETTING

Parameter Value
LOGO DISPLAY 1
PATTERN 0
LOGO INPUT



Table 3.12. Options submenu SYSTEM

Parameter Value
PAL AVTO 1
NTSC 3.58 1
NTSC 1
SECAM 1
I 1
BG 1
M 0
DK 1
OSD-H 9
OSD-V 10
X-TURN 1
Y-TURN 1



Table 3.13. Options submenu FACTORY OPTION

Parameter Value
TV 1
AV 2
SVHS 0
BLUE F 1
PAL ADD 1
ZOOM 1
PLL 0
4:3 1
16:9 1
16:9 L 1
16 OCH 1
AUTO TUNE 0




Table 3.14. Options submenu LANGUAGE OPTION

Parameter Value
ENGLISH 1
GERMAN 1
RUSSIA 1
ARAB 1
CHINESE 1
GAME 1 1
GAME 2 1



Typical fault TVs and their elimination
No picture and sound, the screen is not lit
Network indicator LED1 should light (red). If it is not lit, check
for voltage 5 V microcontroller IC13 (vyv. 12). In the absence of food
is checked stabilizer IC4 (vyv. 1 - 12 V, pin. 2 - "Earth" pin. 3 - 5).
If the input voltage stabilizer is, and the output is missing, possibly a
short circuit in the circuits of the load. Disable pins on the circuit,
and if 5 appears on pin. 3 - remove the cause of short circuit. But
usually, goes down very IC 78L05.
If the power indicator lights, check out the change in potential from
zero to 5 V and back to the pin. 7 IC13, pressing the POWER button on
the remote (or CH + / - on the front of TV). If the potential does not
change, check the external elements IC13: XT11, Q1, ZD2, if they are
functioning properly and the signals on the pin. 10, 11, 17 are normal
(see below), and the bus I2C does not work (at the pin. 27-30
must be pulsed signals scale 5), check non-volatile memory chip IC9. It
is better to replace with a known good working firmware.
If the signal on the pin. 7 IC13 is, testing the work of transistor
Q16 Q17 and receipt voltage of 12 V to the transmitter - on the
capacitor C28 should appear at 12 V. If the power is there, and output
voltage power supply are not available, check for pulses scale 4 ... 5 V
pin. 4 controllers IC6. If the pulses are missing, check the power
supply (12 V on pin. 5) and all the external elements of the chip, but
first and foremost, R13, C44, S72, R28, the feedback circuit R72, VR1,
R30, C151, R1119, R69, C59, the presence of the reference voltage 2,5 V
on pin. 8 IC6 (if there is no 2,5 - chip faulty). If these elements are
functioning properly, check the secondary circuit of the power in the
absence of a short circuit, and if it is, eliminate the cause.
No sound, picture is
In the presence of a sound signal at the output (vyv. 5) audio
amplifier IC201 check capacitor S63, sockets JK3 (with frequent use
headphones lost contact), S5/S7, and the dynamic head. If the signal on
the pin. 5 IC201 is missing, check it at the input - pin. 3 and the pin.
1 IC11. If no signal at the output chips IC11, before replacing it
checks the external elements connected to the pin. 47-54.
No sound when working with low input
Check for sound scale 0,25 ... 0,5 V on pin. 51 IC11. If not, check
for contact in the connector PS2 and serviceability elements R31, R59,
C46. If the signal at the input circuits are, need to be replaced.
No picture, sound is
Checking if the supply voltages on the connector on the LCD panel (5,
12, and -15 V on pins 10 (17, 18, 23), 4 and 11 connector PS1,
respectively). If the power is, visually inspect the lamp lights. If
they do not glow, check the DC / AC-converter on the elements Q14, Q15,
T2, in good condition Connector S7, S9, and lamps themselves. If you
suspect a problem with bulbs, they can be replaced by the equivalent -
resistor of 100 k / 2 W, and check for AC voltage 450 ... 500 V 50 kHz
at the output of the converter.
If the backlight works, but no picture, check out the video processor
IS11 and an interface chip IC1 (see below). In the presence of video
signals at the outputs of chip IC1, is likely to be defective LCD panel
and needed to be replaced.
No picture of TV programs, on-screen menu is
To reduce time troubleshooting it first checks the firmware EEPROM -
replace the chip IC9 a known good (working with the firmware). If there
is no result, check the radio path. To do this, it's best to use the
generator of television signals. SECAM signal colored bands with 38 MHz
IF is served directly on the base of the transistor Q4. If the image
appears likely faulty tuner or its management chain. Check the power and
control signals to the tuner (see below) and solve the problem, if it
is. If the image color bands do not appear on the screen, check out the
replacement filter CF1 and chip IS11. Before replacing the chip to check
its power and quartz XT2 (4,43 MHz).
No color when receiving a broadcast
Perhaps insufficient level received by the antenna TV signal. If it
is not (the other TV is working properly), check the installation of a
color (in our case - SECAM) and the level of color saturation in the
user menu. If everything is OK, check for a signal frequency of 4.43 MHz
on the pin. 38 IC11, without replacing the resonator HT2 and capacitor
C73. If the generator is running, check all the external elements IS12
and chip control and clock signals (see below). If the elements are
functioning properly and the signals are fed to the decoder color -
replace the chip IC12.
TV does not respond to commands from the remote control
Check the remote (its batteries and circuit elements - a chip
resonator 455 kHz, the output transistor and the IR diode). Console can
be quickly verified using a digital or video camera. In Shooting mode,
point the remote at the camera and press a button - the LED on the
remote should light. If the remote working properly, check the
photodetector IR1 (Fig. 2). On the pin. 1 must be a signal to sweep
around 5 V. If the signal is there and goes through a connector to the
input of a microcontroller (vyv. 34), replace IC13.
TV does not respond to commands from the front panel
Click on one of the front panel buttons and check the potential
change at the pin. 13 IC13. If the potential does not change or zero,
the test resistor divider (R9 R8 R47 R6 R5 R4 R26 R29 R45), capacitor
C29. If the potential at the pin. 13 IC13 change when buttons are
pressed, and the reaction of the TV there is no substitute for a
microcontroller.
When replacing the microcontroller should pay attention to the fact
that the new firmware was the same version (we can take from a working
TV). Firmware code is on the case of integrated circuits (eg,
LC863324A-50Z0).
After some time the "go" frequency settings on the TV channel
At first check the power supply circuits IC13 and IC9. Quite often
fails regulator IC4 (78L05) and produces too high voltage (5 instead of 7
... 9). If the power is normal, check the firmware EEPROM - replace the
chip IC9 a known good (working with the firmware). If the problem
persists, perhaps "left" the parameters of the support contour-Video T1
C55 and the signal pin on the AFT. IC11 10 is formed correctly. Needed a
little change this path, turning the core of ¼ of a turn in the first
one, then the other side, checking each time to TV mode, auto search. If
there is no result, check the external elements of IC11, connected to
the pin. 47 and 10. if they are OK - replace IC11. At least replace the
microcontroller.
In manual mode, can tune in to TV channels, as in the automatic - no
Typically, this is due to a malfunction of the microcontroller IC13
Input identification - pin. 33. If a high potential on this pin when
setting the channel appears, but its level is below 2 V, we can try to
solve the problem by increasing the resistor R36 (22 kOhm) to 100 ohms.
If this fails, replace the microcontroller.
There is no synchronization of images
Check the power circuits IC11: 5 V on pin. 8 and 8 on the pin. 18. If
you have problems, check the appropriate stabilizers (IC14 and IC7). If
the power is normal, check (replacement) capacitors C30 (1 uF) and C27
(.033 uF) connected to the pin. 26 IC11. If they are OK and the signal
frame and line sync at the outputs of IC11 in the norm (vyv. 23 and 27),
and the pin. 2 IC1 is absent or distorted composite sync, check out job
sites on chips IC2 and IC3 (see description). If the signal on the pin.
2 IC1 normal, first replace this chip, and then, if the problem is not
solved, - LCD module.
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مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 3:13 pm

Pinout some TV CPU





This table numbering findings of rare and not very good, TV Management Processor.
The cells - numbering for the corresponding output CPU.





CPUSCLSDAVCVPowerHRemoteH.syncV.sincResetXinXout
BM5060 42383115 16
33

34
BM5609 52323655150272829
CX522Ј-054 412 242223
CTV222SPRC1 4241 333132
CTV222SPK 4241 333132
CTV225SЈ-PRC13940424134352627333132
CXP80420Ј-X133SP5553643728444748363435
CXP8042Ј-XXX 6437 363435
CXP804245553643728444748363435
CXP80420Ј-139 6437 364546
CXP80426Ј-139 6437 364546
CXP85116B55/5653/5464 28 4748363435
CXP85224AЈ-101S23/53/5422/55/5644/641828261/472/48363435
CXP85332Ј-108A5/55/566/53/5465/643772612363435
CXP853P40AQ SV491849/5047/4838/56/572719205960302829
CH05001 PCA84C8413940424134352627333132
CHT0803 TMP87CP38N11/3912/40424134352627333132
CHT04063029127 342120171011
CHT0807 TMP87CP38N11/3712/3842736352627333132
CHT0808 TMP87CP38N11/3912/404241 352627333132
CKP1001S KS88C3216 341738362627333132
CKP1001S4142343816362627333132
CKP1003S Z90200AEOS4142343816362627333132
CKP1004S TM87C38N11/3712/384220 40 36 35 26 27 33 31 32
CCU2030 40 5 4 1 3
CCUЈ-FDTVЈ-O6 9 7 27/40 28 26 12 4 1
CCUЈ-2070Ј-LDTVЈ-06A 9/35 7/34 27/40 28 26 12 4 1
GS8234Ј-01F 64 44 29 30 31
IX0442CE 30 14 26 24 25
IX0823GE 37 38/39 1/45 36 49 25 59 58 27 28 29
IX0933CE 1 16 12 10 9 11 33 34
IX0981CE RHЈ-IX0981CEZZ 42 7 9 8 29 28 1 40 41
IX1083CE 42 7 8 29 28 1 40 41
IX1147CEN1 42 1 7 34 35
IX11807CE 21 19/20 64 42 15 5 63 62 29 30 31
IX1194CEN2 42 7 40 41
IX2164CE 21/49 22/50 64 46 3 5 63 62 29 30 31
IX2372CE 21/49 22/50 64 46 3 5 63 62 29 30 31
IX1762CE 21 22 64 42 15 5 63 62 29 30 31
KAIDA8801 1 28 4 2 3
KADA8803 1 40 6 2 3
KS88C3216 39 40 34 17 38 36 26 27 33 31 32
KY88C94 34 33 15 61 37 26 27 55 49 50
LK5103 42 8 33 31 32
LC863316A CHT0406 28/30 27/29 12 7 33 34 20 21 17 10 11
LC864512 3 2 12/21 7 43 44 26 25 17 10 11
CH4801Ј LC864512A-5F43 3 2 12/21 7 43 44 26 25 17 10 11
CHT0403Ј LC864525A-5H61 3 2 12/21 7 43 44 26 25 17 10 11
LC864916A 3 2 12 7 33 34 20 19 16 10 11
M34300N4Ј-O12SP 42 30 9 14 39 38 7 34 35
M34300N4Ј-524SP 42 17 7 34 35
M34300Ј-551SP 42 1 7 34 35
M34300N4Ј-587SP 42 33 9 14 39 38 7 34 35
M34300N4Ј-657SP 42 1 9 14 39 38 7 34 35
M34300N4Ј-555 42 30 9 14 39 38 7 34 35
M34300N4Ј-624SP 42 17 7 34 35
M34300N4Ј-628SP 42 17 14 39 38 7 34 35
M34300N4Ј-721SP 42 17 7 34 35
M37100M8Ј-581 1 25 27 28 29
M37100M8Ј-615SP/B15SP 37/17 38/18 1 41 21 24 59 58 27 28 29
M37102M8 64 44 29 30 31
M37102M8Ј M37102M8-503P 33 34 64 58 16 3 63 62 29 30 31
M37103M4Ј-750SP 1 42 27 28 29
M37201M6 21 22 64 58 15 5 63 62 29 30 31
M37204E8Ј-852SP 35 36 46 58 15 5 63 62 29 30 31
M37210M3Ј-508SP 27 21 18 16 1 2 30 24 25
M37210M3Ј-800SP 27 21 18 16 1 2 30 24 25
M37210M3Ј-902SP 27 21 18 16 1 2 30 24 25
M37210M4Ј-688 42 41 27 31 18 16 1 2 30 24 25
M37210M4Ј-705SP 47 46 27 21 18 16 1 2 30 24 25
M37210M4Ј-786SP 42 41 27 31 18 16 1 2 30 24 25
M37210M3Ј-800SP 27 21 30 24 25
M37210M3Ј-508SP 27 21 30 24 25
M37211M2Ј-609SP 27 22 18 16 1 2 30 24 25
M37220M3 37 38 22 26 11 10 1 2 25 19 20
M491 9 26 11 7 8
M494B1 39 38 25 26
M50124SA 21 10
13
37 38 34 35 23 2 3
M50431Ј-100SP 41 27 36 1 2
M50431Ј-101SP 41 27 36 1 2
M50435Ј-893FP 1 14 11 33 34
M50432Ј-551SP 42 30 16 31 32
M50436Ј-560SP 52 9 36 5 50 51 27 28 29

M50436Ј-560SP
/ 582SP
/ 584SP
/ 589SP
52 6 36 5 51 50 27 28 29
M50436Ј-683SP/688SP 52 6 36 5 51 50 27 28 29
MC68HC16R1 430402CFC 50 108 49 10714/18 26/27 61/63 116 113 132 11 82 71 57 59
MN15142EA1 39 6 9 3 4 8 37 38
MN15151WP 41 48 1/11 25/26 27/28 30/42 43 29 21 36 32 22 7 44 45
MN15152WP 1 29 7 44 45
MN15142TEA1 39 6 8 37 38
MN15245KWC 42 36 8 40 41
MN15245Ј-KWC 42 36 9 3 4 8 41 42
MN152810TTD5 47 48 1/42 43 29 50 36 32 22 7 44 45
MN152810TIX 37 38 1/24 40 34 30 22 7 35 36
MN152811TZX 1 40 7 35 36
MN15282/MN15287KWEC 52 8 29 7 49 50 4 2 3
MN15287KWC 52 8 4 2 3
MN15412TKG 39 6 9 3 4 8 37 38
MN1871611TKA/TNK 60/58 59/57 37/38 61 33 7 1 39 55 54 62 63
MN1872419TKO/TWC 58/60 57/59 38/61 33 7 1 39 55 54 62 63
MN18724197TKO 22 33 54 62 63
MN1872432TW1 60/58 59/57 22/61 33 7 1 39 55 54 62 63
MN1874033TNW/TWY 29/31 60 28/30 59 22/61 33 7/8 1 39 55 54 62 63
MN187Ј-681 37 38 39 21 28 1 27 35 34 40 41
MN37210M4Ј-786 27 31 30 24 25
ONWAKWEC 52 8 4 2 3
ONWAKWEC44 5282974950423
P87C054Ј-7222394042416352627333132
P87C76639/340/228/424116372627333132
PCA84C434 4222 343132
PCA84C4403940424129352627333132
PCA84C440Ј-128 4241 333132
PCA84C440Ј-410 4241 333132
PCA84C444 222S PRC13940424134352627333132
PCA84C640P CTV222S3940424129352627333132
PCA84C640PЈ-030 4241 333132
PCA84C640Ј-O19 4241 333132
PCA84C6413940424134352627333132
PCA84C840P/0543940424129352627333132
PCA84C8413940424129352627333132
PCA841PЈ-1773940424134352627333132
SKP1103S Z90200AEOS4142343816362627333132
SKW01Ј-829A2202373839212812735344041
SMMЈ-201N 5293655150 2829
ST63156 402827341314242526
ST6356B1/TF 402827341314242526
ST6307 4237 333132
ST63674140423738352627333132
ST63684140423738352627333132
ST6368B4Ј-FHO4140423738352627333132
ST6378B4/FK14140423738352627333132
TA1673Ј-1 42 41 33 31 32
TMP47C1238Ј-ANU068 52 51 54 10 47 46 37 38 44 42 43
TMP47C1638-AV353 51 50 54 31 47 46 37 38 44 42 43
TMP47C1638AU353 54 31 44 42 43
TMP47C36NNA01 42 34 33 31 32
TMP47C430N 28 27 26 25 21 22 23
TMP47C433AN 14 13 42 8 35 36 34 33 31 32
TMP47C434N 42 22 33 31 32
TMP47C434AN 42 22 36 35 26 27 33 31 32
TMP47C634N 42 22 36 35 26 27 33 31 32
TMP47C634NЈ-2465 42 22 33 31 32
TMP47C634N353 54 31 44 42 43
TMP47C634N355 54 31 44 42 43
TMP47C837 42 22 36 35 26 27 33 31 32
TMP47C837N 42 22 33 31 32
TMP87CH33N 40 41 42 19 36 35 26 27 33 31 32
TMP87CK36N 39 40 42 34 36 35 26 27 33 31 32
TMP87CM36N 39 40 42 34 36 35 26 27 33 31 32
TMP87CM38N 11/40 12/41 42 7 36 35 26 27 33 31 32
TMP87PM36N R0605: ECT860BF 39 40 42 34 36 35 26 27 33 31 32
TMP87PS38N-X 37/11 38/22 42 7 36 35
3
26 27 33 31 32
Z86227 34 33 14 4 6 5 21 22 9 7 8
Z90361 41 42 34 38 37 36 26 27 33 31 32
47C/638AU353 51 50 54 31 47
49
46 37 38 44 42 43
87CK38N-3584 11 12 42 7 36 35 26 27 33 31 32
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مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 3:14 pm

Entry into service mode and operations to setup TV SAMSUNG 2039



As time passes, some of the TV's settings are changed.
This is due to aging of parts, the deterioration of the emission
properties of the CRT, external factors such as exposure to
electromagnetic fields. Therefore, it is often necessary for those or
other settings of the TV, even if it is defective. These settings
include: the restoration of white balance, setting the range of
brightness, centering on a vertical and horizontal adjustment of the
geometric dimensions of the raster, color purity adjustment, adjustment
of focus of the image, setting the AGC threshold, and others before
making the settings should demagnetize the picture tube.
Each setting has its own characteristics.
Consider from the beginning to the end of the process of their
implementation for TV SAMSUNG 2039. Please note that describes how to
configure apply to other models, SAMSUNG, made on chassis KS1A, with 14
-, 20 - and
21-inch tubes.
The setup process begins with the entrance to the service mode
(Service Mode), which is sometimes called the factory settings (Factory
Mode). Its entrance is also required when replacing the memory chip
IC902 TV and CRT.
Log into the service mode is performed with the remote control (RC).
To do this, perform the following operation (by clicking buttons and
selecting mode):
1. DISPLAY> FACTORY.
2. STAND-BY> DISPLAY> MENU>
> MUTE> POWER ON.
In this case, a message appears
"SERVICE (FACTORY)". Service mode has sections: ADJUST (Settings), OPTION (Options), RESET (Reset).
Access mode settings provided by selecting the appropriate menu item
by pressing buttons adjust the volume VOLUME. In this case, the screen
displays a list of options, whose selection is carried out using the
buttons to switch channels (s, t). Once the desired settings can be
changed in the up or down buttons to adjust the volume. To exit the
service mode, click the button again "FACTORY" or "POWER OFF". Options
available are in this order:
SCT> SBT> BLR> BLB> RG> GG> BG> VSL>>
VS> VA> HS> SC> SDL> STT> SSP> PDL>> NDL>
PSR> NSR> AGC> VOL> LCO> TXP.
Appointment settings, the ranges of their changes, and default values
​​(factory settings) are shown in the table. Column "OSD" - the name of
the settings displayed in the OSD (On Screen Display).

OSDAppointment settingThe adjustment rangeDefault value
SCTSubkontrastnost0…2313
SBTSubyarkost0…239
BLRBlack level (channel R)0…159
BLVBlack level (channel B)0…157
RGEnhancing Video Amplifier R0…6332
GGEnhancing video amplifier G0…6325 (fixed)
BGEnhancing Video Amplifier B0…6331
VSLVertical Tilt0…6319
VSVertical offset0…6338
VAVertical dimension0…6340 (fixed)
HSHorizontal offset0…6330
SCS-correction0…639
CDLThe voltage level at the cathodes0…159
STTSubtsvetovoy tone0…73
SSPSubchetkost0…70
PDLSignal delay PAL0…1515 (fixed)
NDLDelay in the NTSC0…1510
PSRSubtsvetnost PAL0…232
NSRSubtsvetnost NTSC0…235
AGCThreshold to trigger the AGC0…6323
VOLPresetting
Volume
0…6310
LCOInclusion of IF filter when the input signal of SECAM-L0…10
TXPLocation Teletext0…159

In the service mode through a table select optional settings you can
change the values ​​of some parameters (in parentheses are the
recommended options):
- Inclusion of LNA - LNA (ON);
- The choice of receiving signals - SYSTEM;
- Mode sound section - AUDIO (MONO);
- Select the output interface of the TV - JACK (RCA);
- To display on the screen - ZOOM (NOR/ZOOM/16: 9 - normalnyy/uvelichennyy/16: 9);
- Choice of automatic power-off - AUTO POWER (ON);
- Filtering the second IF signal (sound)
- 2nd SIF (ON);
- The inclusion of "hotel mode" - HOTEL MODE (OFF).
SBL option must be turned off (OFF), and BKS option is enabled (ON).
Reset mode (RESET) allows you to automatically install all the
default settings. In this case, automatic modes are set to off (OFF),
and the contents of the tuner settings are erased.
Consider How to adjust some parameters.
1. Check the level of high voltage. First you should check the
power supply "B +", which shall be 125 V. Then, connect the digital
kilovoltmeter to the second anode of CRT, turn on the TV and set levels
brightness and contrast to minimum (achieve zero-current-rays). In this
case, the high voltage should be 27.5 kV. After this increase the
brightness and contrast to maximum. The level of high-voltage change
should not.
2. Adjusting the focus of the image. With the test signal
generator is served black and white signal and control focus to have
clear images of the lines in the center of the screen.
3. Adjusting the voltage on the cathodes
CRT.
Must be concluded GK tube panel connect the oscilloscope probe.
After that, the generator test signals are signaling shades of gray. By
pressing the "P" RC set a standard image size. Variable resistor Screen
VR on TVS set sweep signal 120 ± 2,5 V (Fig. 1).

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Fig. 1
4. Adjusting the color purity. before the start of this
operation is heated television for 20 minutes. Loosen the screw
fastening unit magnets (Fig. 2). The output of the generator test
signals are signaling a white field. With an external coil completely
demagnetizing kinescope. Adjust the contrast and brightness to derive
the maximum. Moving magnets forward or backward along the neck of the
kinescope, sought "appears on the vertical green stripes (Fig. 3).
Carefully shift the block information.
Slowly moving forward block magnets, achieve uniform color vertical
green stripes and temporarily fix the block magnets. Alternatively
include only blue and only the red gun, check the purity of the color
red and blue fields, respectively.
Finally fix the block magnets.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Fig. 2

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Fig. 3
5. Adjustment information. warm up the TV for 20 minutes. Give
a signal net of the field. Rotating ring 4-pole magnets, seeking
information, blue and red vertical lines in the center of the screen
(Fig. 4). By adjusting brightness and contrast deliver the best picture
clarity. Changing the angle between the 4-pole magnets, seeking the best
information, blue and red vertical lines in the center of the screen.
Rotating at the same time the two rings of magnets and save the angle
between them, combine the red and blue horizontal lines in the center of
the screen. Similarly rotated 6-pole magnets, achieving matching red
and blue lines with green. Keep in mind that changing the angle between
the magnets reduces the vertical lines, and their simultaneous rotation -
horizontal. If necessary, repeat the adjustment.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Fig. 4
6. Setting the AGC threshold. To this end, the service mode AGC set value equal to 23.
7. Installation of signal pre-adjusting color. This operation is necessary and the values ​​of PSR NSR set respectively at 2 and 5.
8. Adjusting the geometric dimensions of the raster. Performed
in sequence: SC> VS> HS. On TV give a signal test table. Sets the
value of an S-correction (SC-S-Correction), equal to 9 for 20 - and
21-inch and 0 to 14-inch CRT, and the signal VA, is 40. Changing
settings VSL (slope vertically), to set the size of the raster so that
the lower range were seen four divisions (Fig. 5). then adjust the
setting VS (Vertical Shift) so that the above range were seen four
divisions (Fig.
6). In conclusion, by adjusting HS (Horizontal Size), set the left and
right boundaries of the image (Fig. 7).

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Fig. 5.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Fig. 6

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
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عدد المساهمات : 542
تاريخ التسجيل : 16/06/2010

مُساهمةموضوع: رد: مراجع ودوائر وأعطال و شرح صيانة -CRT-LCD -plasma   الجمعة أبريل 22, 2011 4:05 pm

Repair monitor "DAEWOO" CMC-1509B


The following article describes how
the fault occurring in the circuit
output stage line scan monitors
"DAEWOO" CMC-1509B and CMC-1511B.
Sometimes the repairs coming monitors "DAEWOO"
CMC-1509B which when you turn them into a network
observed flash indicator "POWER" on
front panel, most likely indicates
the presence of an overload pulse source
power on one channel of the secondary
voltage. When you break the power circuit 200 in
overload disappears, which suggests that the defect
located in the circuit output stage horizontal
sweep. Checking the key transistor
output stage line scanning (the so-called HOT -
Horizontal Output Transistor) Q500 (see Figure 1) with
Meter makes it easy to determine its
malfunction.


[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]

But do not hurry up with the inclusion of
monitor the network after replacing the above
transistors on non-defective, because
most cases (in my experience a 100%
cases) out of its failure is accompanied by
damage to the key transistor Q133 (see Figure 2)
in the circuit switching regulator
(Transducer) voltage output
cascade line scan B +.


[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]

In foreign literature, such a scheme
called - High Chopper, usually, as in this case
High Chopper realized on p-channel field
transistor, the source that emits
supply voltage, there is also a scheme and Low
Chopper, a sign which is an n-channel
FET, a source which is connected to
GND. Malfunction of the transistor Q133
also easily determined with a multimeter
(While checking the channel resistance Rsi
is close to zero). After replacing Q500 and Q133
on the healthy original or similar
analogues of the performance monitor
restored.

As the Q500 uses powerful key

2SC4924 (Ukbo = 1500; Ik = 10 A, p. = 70 W; fgr = 6 MHz; h21emin = 8; npn;
housing TO-3PML [1]) or 2SC5299 (Ukbo = 1500; Ik = 10 A, p. = 70 W; fgr = 7
MHz; h21emin = 5; npn; housing TO-3PB [1]). As Q133
used p-channel field-effect transistors with
insulated gate 2SJ449 company "NEC" (Uds = 250
B, IC = 6 A; Psi = 35 W; S = 3500 mA / V; built between the diode
drain and source, insulated housing TO-220F),


IRFI9634G firm "INTERNATIONAL RECTIFIER" (Uds = 250 V, Ic = 4.1 A;
Psi = 35 W; S = 2200 mA / V; built diode between drain and
source; insulated housing TO-220F), data
Site producer firms - [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذا الرابط] Q133 is also on site
almost have been tried and transistors IRFI9630G
IRF9630 firm "INTERNATIONAL RECTIFIER" (Uds = 200 V, Ic = 6.5 A; Psi = 75
Tues; S = 2200 mA / V; built diode between drain and
source [1]). The difference between the IRF9630 and IRFI9630G is
in that first made in the case TO-220AV, with
metal flange for mounting and
install the radiator requires isolating
gaskets and bushings, and a second transistor
comes in an insulated housing TO-220F, that
makes it easy to mount on the radiator.

Few of the appointment of other elements in the schemes
in Figures 1 and 2. At the field n-channel transistor Q503
type IRF640 firm "INTERNATIONAL RECTIFIER" (Uds = 200 V, Ic = 18 A;
Psi = 125 W; S = 6700 mA / V; built diode between drain and
source; housing TO220AV [1]), loaded on
primary winding of transformer T501 is made
predokonechny cascade line scan.
Capacitors S527, S529, S532, S533 are elements
correction circuit size of the screen horizontally
when operating in modes with different resolutions,
switching capacitors, two
electromechanical relays.

Scheme is a key regulator voltage B +
implemented based on chip PWM controller
IC109 UC3842 type of firm "UNITRODE" Output PWM signal with
Pin 6 of the chip enters the buffer
push-pull stage is made on the
complementary pair of transistors Q131 KTA1270/2SA1270
(Ukbo = 35; Ik = 0.5 A, p. = 0.5 W; fgr = 200 MHz; h21emin = 150; pnp;
housing TO-92 [1]) and Q132 KTC3202/2SC3202 (Ukbo = 35; Ik = 0.5 A, p. = 0.3 W;
fgr = 300 MHz; h21emin = 150; npn; housing TO-92 [1]) from "KEC" And further
gate switching transistors Q133, diode DZ130
type DZ12BM (12) in the gate circuit is protective
function. Secondary winding of the transformer T131,
in the circuit drain of the transistor Q131 to the output
3 PWM controller UC3842 signal goes back
communication. PWM signal from the drain of the transistor Q133
rectified by diode D132 type S2L60 (Super Fast Recovery Rectifiers
- Rectifier diode fast recovery;
Uobr = 600 V, IF = 1.5 A) of the firm "SHINDENGEN" And
after the LC-filter S133L131S134 goes to pin 2 (B +)
TDKS.

In the monitors "DAEWOO" CMC-1509B as TDKS T502
Models CF0883 used transformers and FFA81024U,
is completely analogous.

All of the above applies equally to
monitors "DAEWOO" CMC-1511B, which have a scheme
identical pattern CMC-1509B. The only difference is
that the CMC-1511B is not the media and
his scheme, there are no low-power amplifier
frequency and built-in speakers.


In conclusion, we note that
because the damage output transistor
line scan is quite
common fault monitors,
when his replacement is always advisable to check
serviceability of the circuit elements of the stabilizer
voltage B +. As recommended in [2] in such
verification instead of the output stage horizontal
sweep as a load on the food chain B +
You can use a bulb on
voltage of 220 V, power 40:60 Tues REFERENCES:


  1. Catalog "Electronic Components" CJSC
    "Compel". May 1999
  2. Donchenko AL Repair of foreign monitors. Book
    2. - Moscow: Solon, 1999. - 216., Il. - (Series of "Repair";
    Vol. 27).
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