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 أعطال وصيانة تليفزيون-Repair-TV-AKAI

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المدير العام


عدد المساهمات : 2369
تاريخ التسجيل : 16/06/2010
العمر : 56

مُساهمةموضوع: أعطال وصيانة تليفزيون-Repair-TV-AKAI   الخميس يونيو 17, 2010 1:25 pm

Processor ST92195C3B1/OEO
Videoprots STV 2248
When you turn entered into the office . In the derivation of the duty room
could hear the faint whistling . Immediately it became clear that the drop dead
line transistor . Make out sounded - so it is. Changed to a new, propayal all
over the base . Frankly in a hurry ( pressed for time ) . Included . TV starts
up again and it was noised , how will something hem . There was a smell of
burning . He looked - burned R639. I took off the board , took with him. The
next day netoropyas examined - the cause of all ills was a bad contact in the
reservoir S621 vyhldnogo transistor . Faded resistor R639 replaced by 10 com .
(like this should be the resistance of the scheme ) . Including - silence .
That's really the second day, I'll bet - I can not understand why there is no
run. Des Lombards, STV 2248 , unsolder TDKS , check for pulse start - they are
not. Nutrition STV 2248 - okay . Substituted S621 , S618 - did not help.
I can not understand what was going on - loaded up ugliness - help , help they
can ....
Thank you

1-Well, then switch off S646 . The pulses must
be at 48pin !
2-TimurAnd the
launch equipment (PPE ) should be checked on an oscilloscope conclusions
STV2248 when power is turned off with O 3 TR601. Then the closer will become
clear cause malfunction.
3-You wrote that " He took off his board, took away with him.
"
This type of chassis ?
A osku also took off ?
Starting something to do with oskoy ?
And the fact of the posts somehow do not understand where behaving repair .
4-1 . Current , respectively, grew out of a
poorly propayanoy S621 which subsequently propayal ( and later substituted ) .
2. C619 unsolder and measured the ( now try to substitute )
3 . Osku loading the tubes ranged from 54 (although I think that the initial
run should be without it ) .
4. Pulses start checking ostsilografom .
Measured the D605 at 200 IOM . - a drain on
7mom - Dolno do not know whether to be so - temporarily substituted HER307
Jettisoned three output TR601, S646 vypayal .
Pulse start NO !
Can percent flew ? ?
Although pulses SDA and SCL are .....
Damn what else can be ...
Thank you
Someone will tell whether it possible to
replace ST92195C3B1/OEO
Vestel / T3X210

on ST92195C3B1/MBP
OEM STTV V2.1
Certainly percent. But he is usually called
STV224x
Did not rush me at once prots.Impulsy run
times can be evaluated , whether it appears at all, in principle, only the very
first time on the sweep of the oscilloscope 10 -20mS ( HR ) , they appear on a
split second and, if percent found crashed somewhere Then once they chopped off
, and where you look - pulses directly at the foot of the processor? And it is
cut off from the planar resistor percent in the scheme.
Has found dead S643 . Replace - the result is
the same .
With the introduction of television into the office and back osilograf catches
only splash . The presence of pulses is not observed.
Incidentally in this chassis , if there is no
frame , then blocked impulse line ?
He remembered that 2
times a 11AK the situation was very similar , was not run for a second row ,
power supply immediately went into defense, and it was - the closure of 180V
power video amplifier , pierced TDA6107, 6108.Pomnyu very surprised if a smart
defense.
Incidentally, there is still protected at breakage glow ..
All thanks to Romney - TV repaired for a long
time - ?????? time to reply !
Turned out to be dead R426 2.2 com.
thank you very much , Timur R426 croaked
Processor ST92195C3B1/OEO
Videoprots STV 2248
When you turn entered into the office . In the derivation of the duty room
could hear the faint whistling . Immediately it became clear that the drop dead
line transistor . Make out sounded - so it is. Changed to a new, propayal all
over the base . Frankly in a hurry ( pressed for time ) . Included . TV starts
up again and it was noised , how will something hem . There was a smell of
burning . He looked - burned R639. I took off the board , took with him. The
next day netoropyas examined - the cause of all ills was a bad contact in the
reservoir S621 vyhldnogo transistor . Faded resistor R639 replaced by 10 com .
(like this should be the resistance of the scheme ) . Including - silence .
That's really the second day, I'll bet - I can not understand why there is no
run. Des Lombards, STV 2248 , unsolder TDKS , check for pulse start - they are
not. Nutrition STV 2248 - okay . Substituted S621 , S618 - did not help.
I can not understand what was going on - loaded up ugliness - help , help they
can ....
Thank you

1-Well, then switch off S646 . The pulses must
be at 48pin !
2-TimurAnd the
launch equipment (PPE ) should be checked on an oscilloscope conclusions
STV2248 when power is turned off with O 3 TR601. Then the closer will become
clear cause malfunction.
3-You wrote that " He took off his board, took away with him.
"
This type of chassis ?
A osku also took off ?
Starting something to do with oskoy ?
And the fact of the posts somehow do not understand where behaving repair .
4-1 . Current , respectively, grew out of a
poorly propayanoy S621 which subsequently propayal ( and later substituted ) .
2. C619 unsolder and measured the ( now try to substitute )
3 . Osku loading the tubes ranged from 54 (although I think that the initial
run should be without it ) .
4. Pulses start checking ostsilografom .
Measured the D605 at 200 IOM . - a drain on
7mom - Dolno do not know whether to be so - temporarily substituted HER307
Jettisoned three output TR601, S646 vypayal .
Pulse start NO !
Can percent flew ? ?
Although pulses SDA and SCL are .....
Damn what else can be ...
Thank you
Someone will tell whether it possible to
replace ST92195C3B1/OEO
Vestel / T3X210
on ST92195C3B1/MBP
OEM STTV V2.1
Certainly percent. But he is usually called
STV224x
Did not rush me at once prots.Impulsy run
times can be evaluated , whether it appears at all, in principle, only the very
first time on the sweep of the oscilloscope 10 -20mS ( HR ) , they appear on a
split second and, if percent found crashed somewhere Then once they chopped off
, and where you look - pulses directly at the foot of the processor? And it is
cut off from the planar resistor percent in the scheme.
Has found dead S643 . Replace - the result is
the same .
With the introduction of television into the office and back osilograf catches
only splash . The presence of pulses is not observed.
Incidentally in this chassis , if there is no
frame , then blocked impulse line ?
He remembered that 2
times a 11AK the situation was very similar , was not run for a second row ,
power supply immediately went into defense, and it was - the closure of 180V
power video amplifier , pierced TDA6107, 6108.Pomnyu very surprised if a smart
defense.
Incidentally, there is still protected at breakage glow ..
All thanks to Romney - TV repaired for a long
time - ?????? time to reply !
Turned out to be dead R426 2.2 com.
thank you very much , Timur R426 croaked
الرجوع الى أعلى الصفحة اذهب الى الأسفل
SAD
نائب المشرف العام


عدد المساهمات : 843
تاريخ التسجيل : 16/06/2010

مُساهمةموضوع: رد: أعطال وصيانة تليفزيون-Repair-TV-AKAI   الأربعاء سبتمبر 08, 2010 5:39 am

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذا الرابط]
الرجوع الى أعلى الصفحة اذهب الى الأسفل
أشرف عثمان
المدير العام
المدير العام


عدد المساهمات : 2369
تاريخ التسجيل : 16/06/2010
العمر : 56

مُساهمةموضوع: رد: أعطال وصيانة تليفزيون-Repair-TV-AKAI   الجمعة يوليو 08, 2011 10:55 pm



AKAI
CT-2119/14/20/21WKD - repair loop demodulator

AKAI TV-based video processor with off AN5195K radio channel. Fault appears as
a very strong distortion of the "Pictures" as a negative image
silnozashumlennogo Paulsen beats. Accordingly, it is impossible to configure a
TV and no sound. Hit a device to "superspetsu", which would
complicate the picture of his magic and manipulation to diagnose such a device
would be very difficult.
The culprit for this behavior was a tubular channel Conder who reduced
capacity. Conder integrated circuit in the demodulator and now it needs to be
carefully removed with a sharp object destroyed the ceramic body. Instead, it
must be soldered by printing to the extreme conclusions of the circuit ceramic
capacitance 12pF. There is due to extreme conclusions in a series circuit where
the three of them. Next, you need to adjust to the contour of the stations in
search mode, stopping the search took place at fine-tuning to the received channel.
Or set of instruments.



Akai CT-G 215D
No color in SECAM.
Ingredients: TDA8362, TDA4665, TDA8395.
Break all outside TDA8395 and foolish to change it and TDA4665, began to look
for tracks. Everything seems to be fine, except one: the video for the 16th leg
of TDA8395 is a capacitor rather than directly, as the scheme on the 27th leg
of TDA8362. More interesting. The other foot on the tracks that Conder is on
the 9th leg TC4053, that is, SECAM video signal is switched to a TC4053. Why?
It is not clear!
After replacing the TC4053 everything went as it should be. A scheme Akai CT-G
215D, I have not found even on the Internet. Because of this, three times to
the owner of the house went. Still, the right scheme - this is 75% of the
successful repair!



AKAI CT2005EA
Ingredients: TMP47C434N - microcontroller, AN5633 - SECAM, AN5601K - color
processor, TDA8192 - Switch Sound, TDA1904 - ULF, LA7830 - KR, FCM-20A016 -
line transformer, UVE30-R02-tuner, D1555-line transistor, D1402-BP.
When you turn there is no sound, there is only thirty minutes. No OSD on a
vertical sync.
When checking the voltage on the k.15 TDA8192 (locked audio), it slowly rises
from 0.1 to 5-6 in the appearance of the sound. Proved to be defective Ñ125
10.0 h16v (high ESR). After replacing the voltage blocking sound rose 11.5 dl
and the sound comes right after you turn.
The microcontroller (k.27) does not come with the clock staffing LA7830,
although the output m / CD schemes are available. It turned out that the track
between R414 and R650 in the chain of human clock up about eight inches there
is reason to stress + 16.5. I had to cut a track and throw the jumper. OSD
synchronization is restored.


AKAI CT-21WKD - No information is displayed OSD.

The inspection revealed faulty processor KWMCC - On the 22th leg there
is a normal human resource pulse (5V), the 32nd row of the pulse amplitude of
the foot is planted to 1V - formation OSD impossible ...
Defect corrected increase in load capacity circuit HSYNC - to break the chain
contains an additional emitter follower, the pulse amplitude at the 32nd leg
increased to 4.5V, the schedule is stable ...
Due to the scarcity and high cost KWMCC thus "cured" for
several TV ...

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




Akai CT-G2144E Ingredients: Processor
(UOC)-8821CPNG4NC8; HR-AN5522; Tuner-ET-5C1E-CV200K; TDKS 25-BSC-Z720;
HOT-C5296; Power trans-p BS-C5297; screen lights up, but instead of the image
bright-expressed " tree "structure of the raster, sound
normalnyy.Osmotr chassis revealed a slightly swollen, electrolytes (for
de-energized chassis hold your finger on the problem of electrolyte-butt and
feel the bulge butt): C561 (10mfx160v) and C562 (22mfx250V). I myself made the
ESR-top box (Fin . costs around $ Cool to your arrow TS4342-M1-checked quickly
and surely other electrolytes, "kiataezy", oddly enough, were
poryadke.Itak, replaced two of the electrolyte, soldered ring Emerging
treschiny.Normalnaya work vosstanovilas.Rekomenduyu TV all in one form or
another to get ESR-meter-GREAT thing!






In the famous
AKAIvskom BP
(Scheme
of the PSU is not just in AKAI), if burned power switch and
resistance in the emitter it, except to replace Conder diode on power supply
scheme of stabilization. Tester calls it normal, but if not replaced can all
happen again. There have been cases, the TV can work from 3 days to six months,
and then all repeated.



AKAIevsky BP (In my case, the model 2107D) with the same fault as in the previous
post - loss of the diode on the food chain site stabilization and restoration
of PP onnogo for continuity, but led to a short-term due to punching NOTE
overstatement + B. Defect and walking time from weeks to years and was
localized to the use of lavinnika + B. Treatment of the same - the replacement
of suspicion despite a normal a dial.



AKAI CT-21WKD
chassis B20

On the screen wide dark horizontal stripes, the nature of which varies
depending on the subject. It is treated by replacing S436 in the chain of ABL.



TV AKAI CTG2122E chassis
TV-2K

B + too high in the duty room in the operating mode, all normal. When turning
off the TV remote control (DR) are beginning to throb output voltage power
supply, particularly in the jumps up to + 170 V, after which triggered the
protection, the LED flashes, the sound of clicks characteristic of PD. If the
DR load lamp power supply - everything is back to normal. "Culprit"
was the S531, which costs between the two rectifying diodes in the + on the
ground. Par - 0.01 uF. He was a cliff.
The case concerns a TV version of the PSU to the PWM 3S0765RF









_________________

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