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 Service Manuals-schematic- LCD_TV-PHILIPS

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انتقل الى الصفحة : الصفحة السابقة  1, 2, 3
كاتب الموضوعرسالة
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عدد المساهمات : 2369
تاريخ التسجيل : 16/06/2010
العمر : 56

مُساهمةموضوع: رد: Service Manuals-schematic- LCD_TV-PHILIPS   السبت ديسمبر 14, 2013 3:48 pm

PHILIPS 32PFL5406H/60 Шасси TPM6.1E LA

MATRIX: LC320EXE (SD)(N6)
MAIN: 715G4722-M1C-000-005B
Tuner: ENV57U03D5F
T-CON: T-Con LC320EXN 6870C-0370A
PSU & INVERTOR: 715G4738-P01-H20-002U

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

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ТЕМЫ С НЕИСПРАВНОСТЯМИ:

Philips 32PFL5406H/60 тухнет подсветка

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

مُساهمةموضوع: رد: Service Manuals-schematic- LCD_TV-PHILIPS   السبت ديسمبر 14, 2013 3:48 pm

PHILIPS 32PFL3017H/60 Шасси TPM9.1E LA

MATRIX: LC320WUE
MAIN: 715G5155-M0B-002-005K
HY27UF082G2B
24С16
STA3818W
1CA28HTG4/TMDS361B
MT5135AE
Tuner: ENV57U09D5F
T-CON: P/N 6870-0318B Ver0.7
TL2428MC
PSU & INVERTOR: 715G5113-P02-002M
STRA6069H
LD7591GS
LD7523GS
OZ9976GN

Сервис мануал

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

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

ТЕМЫ С НЕИСПРАВНОСТЯМИ:

БП от Philips 715G5113-P02-W21-002m
Philips 32PFL3017H/60 ch.TPM9.1E LA неправильно включается

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

مُساهمةموضوع: رد: Service Manuals-schematic- LCD_TV-PHILIPS   السبت ديسمبر 14, 2013 3:49 pm

Philips 19PFL4322/10 шасси TPS1.0E LA

CPU - MST96885ALD-LF
EPROM - HY57V641620FTP-6
EEPROM - ST24C32WP
SMPS - LD7575PS + 2SK2996
Sound - STA333BW
Tuner - 3139 147 26431C# FQ1216MEV/I H5
IC Remote - G2-318 H3A1A

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

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

ТЕМЫ С НЕИСПРАВНОСТЯМИ:

PHILIPS 19PFL4322/10 нет подсветки
Шасси TPS1.0E LA не включается (РЕШЕНО)


Запчасти для телевизоров Philips

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المدير العام
المدير العام


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

مُساهمةموضوع: رد: Service Manuals-schematic- LCD_TV-PHILIPS   السبت ديسمبر 14, 2013 3:50 pm

Philips 20PFL4122/10 шасси TPS1.0E LA

MATRIX: LC201V02
MAIN: 715T2229-2
MST96885LD-LF
S25FL008A
STA333BW
PSU & INVERTOR: 715T2572-1
OZT1060GN
AO4606
80TL20T-910-DN

Сервис мануал на шасси TPS1.0E LA

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

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


ТЕМЫ С НЕИСПРАВНОСТЯМИ:

Philips 20PFL4122/10 шасси TPS1.0E LA не включается
Philips 20PFL4122/10 проблема с изображением.



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المدير العام


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

مُساهمةموضوع: رد: Service Manuals-schematic- LCD_TV-PHILIPS   السبت ديسمبر 14, 2013 3:50 pm

Philips 32PFL3404/60 шасси TPS2.1E LA

MATRIX: LC320WXE(SB)(A1)
MAIN: 715G3285-1B Z-SIDE
MST9A885GL-LF
W9412G6IH-4
Tuner: TAFT-S710D
T-CON: LC320WXN-SBA1 6870C-0238B
TL2417MC
TPS65161
BUF08621
PSU & INVERTOR: 715G3308-1
TNY277PN
1271A
UBA2071AT

Сервис мануал

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

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الرجوع الى أعلى الصفحة اذهب الى الأسفل
أشرف عثمان
المدير العام
المدير العام


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

مُساهمةموضوع: PHILIPS 32HFL5382 - 37HFL5382 - 42HFL5382   الأربعاء يناير 27, 2016 2:00 pm


PHILIPS 32HFL5382 - 37HFL5382 - 42HFL5382 - Power supply circuit diagram - l6599 - sg6961- LCD Television repair and service



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

Category: LCD Television Repair and Service 


Contents of this article



  • Power supply circuit digram 
  • L6599 Details 
  • SG6961 Details  


PHILIPS 32HFL5382 - 37HFL5382 - 42HFL5382

L6599
Description
The L6599 is a double-ended controller specific for the resonant half-bridge topology. It provides 50 % complementary duty cycle: the high-side switch and the low-side switch are driven ON\OFF 180° out-of-phase for exactly the same time. Output voltage regulation is obtained by modulating the operating frequency. A fixed deadtime inserted between the turn-OFF of one switch and the turn-ON of the other one guarantees soft-switching and enables high-frequency operation.
To drive the high-side switch with the bootstrap approach, the IC incorporates a high-voltage floating structure able to withstand more than 600 V with a synchronous-driven high-voltage DMOS that replaces the external fast-recovery bootstrap diode. The IC enables the designer to set the operating frequency range of the converter by means of an externally programmable oscillator.
At start-up, to prevent uncontrolled inrush current, the switching frequency starts from a programmable maximum value and progressively decays until it reaches the steady-state value determined by the control loop. This frequency shift is non linear to minimize output voltage overshoots; its duration is programmable as well. The IC can be forced to enter a controlled burst-mode operation at light load, so as to keep converter's input consumption to a minimum. IC's functions include a not-latched active-low disable input with current hysteresis useful for power sequencing or for brownout protection, a current sense input for OCP with frequency shift and delayed shutdown with automatic restart. A higher level OCP latches off the IC if the first-level protection is not sufficient to control the primary current. Their combination offers complete protection against overload and short circuits. An additional latched disable input (DIS) allows easy implementation of OTP and/or OVP.
An interface with the PFC controller is provided that enables to switch off the pre-regulator during fault conditions, such as OCP shutdown and DIS high, or during burst-mode operation.

PIN CONFIGURATION 
1 C SS
Soft start. This pin connects an external capacitor to GND and a resistor to RFmin (pin 4) that set both the maximum oscillator frequency and the time constant for the frequency shift that occurs as the chip starts up (soft-start). An internal switch discharges this capacitor every time the chip turns OFF (VCC < UVLO, LINE < 1.25 V or > 6 V, DIS > 1.85 V, ISEN > 1.5 V, DELAY > 3.5 V) to make sure it will be soft-started next, and when the voltage on the current sense pin (ISEN) exceeds 0.8V, as long as it stays above 0.75 V.
2 DELAY
Delayed shutdown upon overcurrent. A capacitor and a resistor are connected from this pin to GND to set both the maximum duration of an overcurrent condition before the IC stops switching and the delay after which the IC restarts switching. Every time the voltage on the ISEN pin exceeds 0.8 V the capacitor is charged by an internal 150µA current generator and is slowly discharged by the external resistor. If the voltage on the pin reaches 2 V, the soft start capacitor is completely discharged so that the switching frequency is pushed to its maximum value and the 150 µA is kept always on. As the voltage on the pin exceeds 3.5 V the IC stops switching and the internal generator is turned OFF, so that the voltage on the pin will decay because of the external resistor. The IC will be soft-restarted as the voltage drops below 0.3V. In this way, under short circuit conditions, the converter will work intermittently with very low input average power.
3 CF
Timing capacitor. A capacitor connected from this pin to GND is charged and discharged by internal current generators programmed by the external network connected to pin 4 (RFmin) and determines the switching frequency of the converter.

4 RFmin
Minimum oscillator frequency setting. This pin provides a precise 2 V reference and a resistor connected from this pin to GND defines a current that is used to set the minimum oscillator frequency. To close the feedback loop that regulates the converter output voltage by modulating the oscillator frequency, the phototransistor of an optocoupler will be connected to this pin through a resistor. The value of this resistor will set the maximum operating frequency. An R-C series connected from this pin to GND sets frequency shift at start-up to prevent excessive energy inrush (soft-start).
5 STBY
Burst-mode operation threshold. The pin senses some voltage related to the feedback control, which is compared to an internal reference (1.25 V). If the voltage on the pin is lower than the reference, the IC enters an idle state and its quiescent current is reduced. The chip restarts switching as the voltage exceeds the reference by 50 mV. Soft-start is not invoked. This function realizes burst-mode operation when the load falls below a level that can be programmed by properly choosing the resistor connecting the optocoupler to pin RFmin (see block diagram). Tie the pin to RFmin if burst-mode is not used.
6 ISEN
Current sense input. The pin senses the primary current though a sense resistor or a capacitive divider for lossless sensing. This input is not intended for a cycle-by-cycle control; hence the voltage signal must be filtered to get average current information. As the voltage exceeds a 0.8 V threshold (with 50 mV hysteresis), the soft-start capacitor connected to pin 1 is internally discharged: the frequency increases hence limiting the power throughput. Under output short circuit, this normally results in a nearly constant peak primary current. This condition is allowed for a maximum time set at pin 2. If the current keeps on building up despite this frequency increase, a second comparator referenced at 1.5 V latches the device off and brings its consumption almost to a “before start-up” level. The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to restart: the latch is removed as the voltage on the Vcc pin goes below the UVLO threshold. Tie the pin to GND if the function is not used.
7 LINE
Line sensing input. The pin is to be connected to the high-voltage input bus with a resistor divider to perform either AC or DC (in systems with PFC) brownout protection. A voltage below 1.25 V shuts down (not latched) the IC, lowers its consumption and discharges the soft-start capacitor. IC’s operation is re-enabled (soft-started) as the voltage exceeds 1.25 V. The comparator is provided with current hysteresis: an internal 15 µA current generator is ON as long as the voltage applied at the pin is below 1.25 V and is OFF if this value is exceeded. Bypass the pin with a capacitor to GND to reduce noise pick-up. The voltage on the pin is top-limited by an internal zener. Activating the zener causes the IC to shut down (not latched). Bias the pin between 1.25 and 6 V if the function is not used.
8 DIS
Latched device shutdown. Internally the pin connects a comparator that, when the voltage on the pin exceeds 1.85 V, shuts the IC down and brings its consumption almost to a “before start-up” level. The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to restart: the latch is removed as the voltage on the VCC pin goes below the UVLO threshold. Tie the pin to GND if the function is not used.
9 PFC_STOP
Open-drain ON/OFF control of PFC controller. This pin, normally open, is intended for stopping the PFC controller, for protection purpose or during burst-mode operation. It goes low when the IC is shut down by DIS > 1.85 V, ISEN > 1.5 V, LINE > 6 V and STBY < 1.25 V. The pin is pulled low also when the voltage on pin DELAY exceeds 2V and goes back open as the voltage falls below 0.3V. During UVLO, it is open. Leave the pin unconnected if not used.
10 GND
Chip ground. Current return for both the low-side gate-drive current and the bias current of the IC. All of the ground connections of the bias components should be tied to a track going to this pin and kept separate from any pulsed current return.

11 LVG
Low-side gate-drive output. The driver is capable of 0.3 A min. source and 0.8 A min. sink peak current to drive the lower MOSFET of the half-bridge leg. The pin is actively pulled to GND during UVLO.
12 VCC
Supply Voltage of both the signal part of the IC and the low-side gate driver. Sometimes a small bypass capacitor (0.1 µF typ.) to GND might be useful to get a clean bias voltage for the signal part of the IC.
13 N.C.

High-voltage spacer. The pin is not internally connected to isolate the high-voltage pin and ease compliance with safety regulations (creepage distance) on the PCB.
14 OUT
High-side gate-drive floating ground. Current return for the high-side gate-drive current. Layout carefully the connection of this pin to avoid too large spikes below ground.
15 HVG
High-side floating gate-drive output. The driver is capable of 0.3 A min. source and 0.8A min. sink peak current to drive the upper MOSFET of the half-bridge leg. A resistor internally connected to pin 14 (OUT) ensures that the pin is not floating during UVLO.
16 VBOOT
High-side gate-drive floating supply Voltage. The bootstrap capacitor connected between this pin and pin 14 (OUT) is fed by an internal synchronous bootstrap diode driven in-phase with the low-side gate-drive. This patented structure replaces the normally used external diode.

SG6961
Description
The SG6961 is an 8-pin boundary mode PFC controller IC intended for controlling PFC pre-regulators. The SG6961 provides a controlled on-time to regulate the output DC voltage and achieve natural power factor correction. The maximum on-time of the external switch is programmable to ensure safe operation during AC brownouts. An innovative multi-vector error amplifier is built in to provide rapid transient response and precise output voltage clamping. A built-in circuit disables the controller if the output feedback loop is opened. The startup current is lower than 20JA and the operating current is under 4.5mA. The supply voltage can be up to 20V, maximizing application flexibility.
PIN CONFIGURATION
1 INV - lnverting Input of the Error Amplifier. INV is connected to the converter output via a resistive divider. This pin is also used for over-voltage clamping and open-loop feedback protection.
2 COMP -  The Output of the Error Amplifier. To create a precise clamping protection, a compensation network between this pin and GND is suggested.
3 MOT -  Maximum On Time. A resistor from MOT to GND is used to determine the maximum on-time of the external power MOSFET. The maximum output power of the converter is a function of the maximum on time.
4 CS -  Current Sense. lnput to the over-current protection comparator. When the sensed voltage across the sense resistor reaches the internal threshold (O.8V), the switch is turned off to activate cycle-by-cycle current limiting.
5 ZCD -  Zero Current Detection. This pin is connected to an auxiliary winding via a resistor to detect the zero crossing of the switch current. When the zero crossing is detected, a new switching cycle is started. If it is connected to GND, the device is disabled.
6 GND -  Ground. The power ground and signal ground. Placing a O.1pF decoupling capacitor between VCC and GND is recommended.
7 GD -  Driver Output. Totem-pole driver output to drive the external power MOSFET. The clamped gate output voltage is 16.5V.

8 VCC - Power Supply. Driver and control circuit supply voltage.
POWER SUPPLY CIRCUIT 
32 INCH
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37 AND 42 INCH 

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المدير العام
المدير العام


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

مُساهمةموضوع: PHILIPS 46PFL5507 3D LED Smart   الأربعاء يناير 27, 2016 2:07 pm

PHILIPS 46PFL5507 3D LED Smart television - Service mode - SDM - SAM - CSM - Fault finding tips - LED Television repair and service - Manual service


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

Category: LED Television Repair and Service 


Contents of this article 



  • Service modes
  • Fault finding tips 
  • Debugging 


PHILIPS 46PFL5507


Service Modes
Service Default mode (SDM) and Service Alignment Mode (SAM) offers several features for the service technician, while the Customer Service Mode (CSM) is used for communication between the call centre and the customer. This chassis also offers the option of using ComPair, a hardware interface between a computer and the TV chassis. It offers the abilities of structured troubleshooting, error code reading, and software version read-out for all chassis.
Note: For the new model range, a new remote control (RC) is used with some renamed buttons. This has an impact on the activation of the Service modes. For instance the old “MENU” button is now called “HOME” (or is indicated by a “house” icon)

Service Default Mode (SDM)
Purpose
# To create a pre-defined setting, to get the same measurement results as given in this manual.
# To override software protections detected by stand-by processor and make the TV start up to the step just before protection (a sort of automatic stepwise start-up).
# To start the blinking LED procedure where only LAYER 2 errors are displayed.

How to Activate SDM
For this chassis there are two kinds of SDM: an analogue SDM and a digital SDM. .
# Analogue SDM: use the standard RC-transmitter and key in the code “062596”, directly followed by the “MENU” (or “HOME”) button.
Note: It is possible that, together with the SDM, the main menu will appear. To switch it “off”, push the “MENU” (or "HOME") button again.
Analogue SDM can also be activated by grounding for a moment the solder path on the SSB, with the indication “SDM” .
# Digital SDM: use the standard RC-transmitter and key in the code “062593”, directly followed by the “MENU” (or "HOME") button.

Note: It is possible that, together with the SDM, the main menu will appear. To switch it “off”, push the “MENU” (or "HOME") button again.

Service mode pad 
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After activating this mode, “SDM” will appear in the upper right corner of the screen (when a picture is available).
How to Exit SDM
Use one of the following methods:
# Switch the set to STAND-BY via the RC-transmitter.
# Via a standard customer RC-transmitter: key in “00”- sequence.

Service Alignment Mode (SAM)
Purpose
# To perform (software) alignments.
# To change option settings.
# To easily identify the used software version.
# To view operation hours.
# To display (or clear) the error code buffer.
How to Activate SAM
Via a standard RC transmitter: Key in the code “062596” directly followed by the “INFO” or “OK” button. After activating SAM with this method a service warning will appear on the screen, continue by pressing the “OK” button on the RC.

How to Navigate
# In SAM, the menu items can be selected with the “CURSOR UP/DOWN” key on the RC-transmitter. The selected item will be highlighted. When not all menu items fit on the screen, move the “CURSOR UP/DOWN” key to display the next/previous menu items.
# With the “CURSOR LEFT/RIGHT” keys, it is possible to:
– (De) activate the selected menu item.
– (De) activate the selected sub menu.
# With the “OK” key, it is possible to activate the selected action.
How to Exit SAM
Use one of the following methods:
# Switch the TV set to STAND-BY via the RC-transmitter.
# Via a standard RC-transmitter, key in “00” sequence, or select the “BACK” key

Customer Service Mode (CSM)
Purpose
When a customer is having problems with his TV-set, he can call his dealer or the Customer Helpdesk. The service technician can then ask the customer to activate the CSM, in order to identify the status of the set. Now, the service technician can judge the severity of the complaint. In many cases, he can advise the customer how to solve the problem, or he can decide if it is necessary to visit the customer. The CSM is a read only mode; therefore, modifications in this mode are not possible.
When in this chassis CSM is activated, a test pattern will be displayed during 5 seconds (1 second Blue, 1 second Green and 1 second Red, then again 1 second Blue and 1 second Green). This test pattern is generated by the PNX51X0 (located on the 200Hz board as part of the display). So if this test pattern is shown, it could be determined that the back end video chain (PNX51X0 and display) is working.For TV sets without the PNX51X0 inside, every menu from CSM will be used as check for the back end chain video. When CSM is activated and there is a USB stick connected to the TV set, the software will dump the CSM content to the USB stick. The file (CSM_model number_serial number.txt) will be saved in the root of the USB stick. This info can be handy if no information is displayed.
When in CSM mode (and a USB stick connected), pressing “OK” will create an extended CSM dump file on the USB stick. This file (Extended_CSM_model number_serial number.txt) contains:
# The normal CSM dump information,
# All items (from SAM “load to USB”, but in readable format),
# Operating hours,
# Error codes,
# Software/Hardware event logs.
To have fast feedback from the field, a flashdump can be requested by development. When in CSM, push the “red” button and key in serial digits ‘2679’ (same keys to form the word ‘COPY’ with a cellphone). A file “Dump_model number_serial number.bin” will be written on the connected USB device. This can take 1/2 minute, depending on the quantity of data that needs to be dumped. Also when CSM is activated, the LAYER 1 error is displayed via blinking LED. Only the latest error is displayed.

How to Activate CSM
Key in the code “123654” via the standard RC transmitter.
Note: Activation of the CSM is only possible if there is no (user) menu on the screen!

How to Navigate
By means of the “CURSOR-DOWN/UP” knob on the RCtransmitter, can be navigated through the menus.
Contents of CSM
The contents are reduced to 3 pages: General, Software versions and Quality items. The group names itself are not shown anywhere in the CSM menu.

Fault Finding and Repair Tips
Audio Amplifier
The Class D-IC 7D60 has a powerpad for cooling. When the IC is replaced it must be ensured that the powerpad is very well pushed to the PWB while the solder is still liquid. This is needed to insure that the cooling is guaranteed, otherwise the Class DIC could break down in short time.
AV PIP
To check the AV PIP board (if present) functionality, a dedicated tespattern can be invoke as follows: select the “multiview” icon in the User Interface and press the “OK” button. Apply for the main picture an extended source, e.g. HDMI input. Proceed by entering CSM (push ‘123654’ on the remote control) and press the yellow button. A coloured testpattern should appear now, generated by the AV PIP board (this can take a few seconds).
CSM
When CSM is activated and there is a USB stick connected to the TV, the software will dump the complete CSM content to the USB stick. The file (Csm.txt) will be saved in the root of the USB stick. If this mechanism works it can be concluded that a large part of the operating system is already working (MIPS, USB...)
DC/DC Converter
Description basic board
The basic board power supply consists of 4 DC/DC converters and 5 linear stabilizers. All DC/DC converters have +12V input voltage and deliver:
# +1V1 supply voltage (1.15V nominal), for the core voltage of PNX855xx, stabilized close to the point of load; SENSE+1V1 signal provides the DC-DC converter the needed feedback to achieve this.
# +1V8 supply voltage, for the DDR2 memories and DDR2 interface of PNX855xx.
# +3V3 supply voltage (3.30V nominal), overall 3.3 V for onboard IC’s, for non-5000 series SSB diversities only.
# +5V (5.15V nominal) for USB, WIFI and Conditional Access Module and +5V5-TUN for +5V-TUN tuner stabilizer.
The linear stabilizers are providing:
# +1V2 supply voltage (1.2V nominal), stabilized close to PNX855xx device, for various other internal blocks of PNX855xx; SENSE+1V2 signal provides the needed feedback to achieve this.
# +2V5 supply voltage (2.5V nominal), for LVDS interface and various other internal blocks of PNX855xx. Stabilizer
7UC0 is used (diagram B02B).
# +3V3 supply voltage (3V3 nominal), is provided by 7UD1 (diagram B02C); the 12 V to 3V3 DC-DC converter delivers the supply voltage to the PNX855xx.
# +5V-TUN supply voltage (5V nominal) for tuner and IF amplifier.

+3V3-STANDY (3V3 nominal) is the permanent voltage, supplying the Stand-by microprocessor inside PNX855xx. Supply voltage +1V1 is started immediately when +12V voltage becomes available (+12V is enabled by STANDBY signal when "low"). Supply voltages +3V3, +2V5, +1V8, +1V2 and +5V-TUN are switched "on" by signal ENABLE-3V3 when "low", provided that +12V (detected via 7U40 and 7U41) is present. +12V is considered OK (=> DETECT2 signal becomes "high", +12V to +1V8, +12V to +3V3, +12V to +5V DC-DC converter can be started up) if it rises above 10V and doesn’t drop below 9V5. A small delay of a few milliseconds is introduced between the start-up of 12V to +1V8 DC-DC converter and the two other DC-DC converters via 7U48 and associated components. Description DVB-S2:
# LNB-RF1 (0V = disabled, 14V or 18V in normal operation) LNB supply generated via the second conversion channel of 7TP2 (diagram B03B) LNB supply control IC. It provides supply voltage that feeds the outdoor satellite reception equipment.
# +3V3-DVBS (3V3 nominal), +2V5-DVBS (2V5 nominal) and +1V-DVBS (1.03V nominal) power supply for the silicon tuner and channel decoder. +1V-DVBS is generated via a 5V to 1V DC-DC converter and is stabilized at the point of load (channel decoder) by means of feedback signal SENSE+1V0-DVBS. +3V3-DVBS and +2V5-DVBS are generated via linear stabilizers from +5V-DVBS that by itself is generated via the first conversion channel of 7TP2. At start-up, +24V becomes available when STANDBY signal is "low" (together with +12V for the basic board), when +3V3 from the basic board is present the two DC-DC converters channels inside 7TP2 are activated. Initially only the 24V to 5V converter (channel 1 of 7TP2 generating +5V-DVBS) will effectively work, while +V-LNB is held at a level around 11V7 via diode 6TP5. If +24V drops below +15V level then the DVB-S2 supply will stop, even if +3V3 is still present.
Note: +24V audio is used in 4000 series, 4300 & 5000 series use +12V audio.
Debugging
The best way to find a failure in the DC/DC converters is to check their start-up sequence at power “on” via the mains cord, presuming that the stand-by microprocessor and the external
supply are operational. Take STANDBY signal "high"-to-"low" transition as time reference. When +12V becomes available (maximum 1 second after STANDBY signal goes "low") then +1V1 is started immediately. After ENABLE-3V3 goes "low", all the other supply voltages should rise within a few milliseconds.
Tips
# Behaviour comparison with a reference TV550 platform can be a fast way to locate failures.
# If +12V stays "low", check the integrity of fuse 1U40.
# Check the integrity (at least no short circuit between drain and source) of the power MOS-FETs before starting up the platform in SDM, otherwise many components might be damaged. Using a ohmmeter can detect short circuits between any power rail and ground or between +12V and any other power rail.
# Short circuit at the output of an integrated linear stabilizer (7UC0) will heat up this device strongly.
# Switching frequencies should be 500 kHz ...600 kHz for 12 V to 1.1 V and 12 V to 1.8 V DC-DC converters, 900 kHz for 12 V to 3.3 V and 12 V to 5 V DC-DC converters. The DVB-S2 supply 24 V to 5 V and 24 V to +V LNB DC-DC converters operates at 300 kHz while for 5 V to 1.1 V DC-DC converter 900 kHz is used.

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