Sanyo 42XR7H, LCD-42XR7H Schematic

FILE NO.

SERVICE MANUAL

LCD TV

LCD-42XR7H

PRODUCT CODE No. 1 682 344 04: PAL/SECAM 1 682 344 14: SANYO India

REFERENCE No.:SM0915009

CONTENTS

Safety Precautions………………………………………………………………………..…

Alignment instructions. ………………………………….…………………………….…

Software upgrade method…………………………………………….……………………

Block diagram………………………………………………………………………………

Working principle analysis of the unit……………………..……………………….……

IC block diagram……………………………………………………………..…………….

Wiring diagram……………………………………………………………………………..…

Troubleshooting………………………………………………………..…………….…….

Schematic diagram…………………………………………………………………………..

APPENDIX-A: Assembly list APPENDIX-B: Exploded view

4Attention: This service manual is only for service personnel to take reference with. Before

servicing please read the following points carefully.

Safety precautions

1. Instructions

Be sure to switch off the power supply before replacing or welding any components or inserting/plugging in connection wire Anti static measures to be taken (throughout the entire production process!): a) Do not touch here and there by hand at will; b) Be sure to use anti static electric iron; c) It’s a must for the welder to wear anti static gloves. Please refer to the detailed list before replacing components that have special safety requirements. Do not change the specs and type at will.

2. Points for attention in servicing of LCD

2.1 Screens are different from one model to another and therefore not interchangeable. Be sure to use the screen of the original model for replacement.

2.2 The operation voltage of LCD screen is 700-825V. Be sure to take proper measures in protecting yourself and the machine when testing the system in the course of normal operation or right after the power is switched off. Please do not touch the circuit or the metal part of the module that is in operation mode. Relevant operation is possible only one minute after the power is switched off.

2.3 Do not use any adapter that is not identical with the TV set. Otherwise it will cause fire or damage to the set.

2.4 Never operate the set or do any installation work in bad environment such as wet bathroom, laundry, kitchen, or nearby fire source, heating equipment and devices or exposure to sunlight etc. Otherwise bad effect will result.

2.5 If any foreign substance such as water, liquid, metal slices or other matters happens to fall into the module, be sure to cut the power off immediately and do not move anything on the module lest it should cause fire or electric shock due to contact with the high voltage or short circuit.

2.6 Should there be smoke, abnormal smell or sound from the module, please shut the power off at once. Likewise, if the screen is not working after the power is on or in the course of operation, the power must be cut off immediately and no more operation is allowed under the same condition.

2.7 Do not pull out or plug in the connection wire when the module is in operation or just after the power is off because in this case relatively high voltage still remains in the capacitor of the driving circuit. Please wait at least one minute before the pulling out or plugging in the connection wire.

2.8 When operating or installing LCD please don’t subject the LCD components to bending, twisting or extrusion, collision lest mishap should result.

2.9 As most of the circuitry in LCD TV set is composed of CMOS integrated circuits, it’s necessary to pay attention to anti statics. Before servicing LCD TV make sure to take anti static measure and ensure full grounding for all the parts that have to be grounded.

2.10 There are lots of connection wires between parts behind the LCD screen. When servicing or moving the set please take care not to touch or scratch them. Once they are damaged the screen

would be unable to work and no way to get it repaired. If the connection wires, connectors or components fixed by the thermotropic glue need to disengage when service, please soak the thermotropic glue into the alcohol and then pull them out in case of dagame.

2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling.

2.12 For the storage make sure to put it in a place where the environment can be controlled so as to prevent the temperature and humidity from exceeding the limits as specified in the manual. For prolonged storage, it is necessary to house it in an anti-moisture bag and put them altogether in one place. The ambient conditions are tabulated as follows:

Temperature Scope for operation 0 ~ +50 oC

Scope for storage -20 ~ +60 oC

Humidity Scope for operation 20% ~ 85%

Scope for storage 10% ~ 90%

2.13 Display of a fixed picture for a long time may result in appearance of picture residue on the screen, as commonly called “ghost shadow”. The extent of the residual picture varies with the maker of LCD screen. This phenomenon doesn’t represent failure. This “ghost shadow” may remain in the picture for a period of time (several minutes). But when operating it please avoid displaying still picture in high brightness for a long time.

3. Points for attention during installation

3.1 The front panel of LCD screen is of glass. When installing it please make sure to put it in place.

3.2 For service or installation it’s necessary to use specified screw lest it should damage the screen.

3.3 Be sure to take anti dust measures. Any foreign substance that happens to fall down between the screen and the glass will affect the receiving and viewing effect

3.4 When dismantling or mounting the protective partition plate that is used for anti vibration and insulation please take care to keep it in intactness so as to avoid hidden trouble.

3.5 Be sure to protect the cabinet from damage or scratch during service, dismantling or mounting.

Alignment instructions

1. Test equipment

Digital Multimeter, SCART signal generator FLUKE54200, Oscillograph PC( FLASH writing program has to be installed firstly), VG848( VGA,YPBPR signal generator) CA210 (white balancer), DVD player with HDMI output, TV set with SCART terminal IF signal generator

2. The alignment flow chart (see below figure)

Connect with central signal source, then check each function of TV such as statio

missing, system identify, analog control etc., check the output of headphone and speaker

Input SCART/AV/S signal, then check each function of all the terminals

Input TV/AV/S terminal/SCART/VGA signal, and check the SCART OUTPUT at the

SCART OUTPUT situation of TV or MONITOR

Input VGA signal and check the display at PC status, check each function such as

analog control etc., check horizontal /vertical center etc.

Input HDMI signal, check if the display is normal at HDMI1 and HDMI2, check soun

and each function such as analog control etc.

Input DVB-T digital signal, check each function of the DVB-T.

Flash writing N401, NA02, NS01, NB06, NB15

To produce main board and TV board

TV board adjustment

Check main board

Check TV board

Combined test for general assembly

Preset ex-factory

Check the accessories and pack them in box

Fig-1 adjustment flow-chart

3. Instruction on adjusting

3.1 Method of entering the factory menu

The method of entering the factory menu is SOURCE, 2, 5, 8, 0. Press 1 to enter page1, the function is Cotez Feature Setting, to set LOGO, frequency ect,. Press 2 to enter page2, the function is Color Temperature Setting. The color temperature now is

12000. Press 3 to enter page3, the function is Auto Color setting, to set AUTO COLOR of each channel.

3.2 Writing program

Write EEPROM N401, NA02, NS01, NB06, NB15.

3.3 Main board adjustment

a) Connect X401 of main board and IR board, insert 11-pin wire of power board to XB7, then the

indicator light of IR board should be red.

b) Press POWER on the remote control, now the indicator light of IR board turns blue, test XB7

PIN1 to be 9V, PIN3 5V, PIN5/PIN6 12V, PIN9 3.3V, LB04 3.3V, NS03 PIN2 1.8V, N404 PIN2

2.5V.

c) Connect PC and serial terminal, flash write HDCP KEY.

3.4 TV board adjustment

3.4.1 IF amplify adjustment

a) Base on 3.3 a), connect 6-pin wire of power board and X04 of TV board, press POWER on the

remote control, now the indicator light of IR board turns blue, TEST PIN2 of X04 to be 5V, PIN4 9V, L07 3.3V.

b) Input +5V to TP1 and 0V to TP2, input 38.9m IF signal to J1(use IF signal generator), adjust L10

to let X08 be 1.6V.

c) Input 0V to TP1 and +5V to TP2, input 33.5m IF signal to J1(use IF signal generator), adjust

RP01 to let X08 be 1.6V.

d) Joint the tuner J1.

3.4.2 Unit connect adjustment

Connect the main board, TV board, IR board, SCART connect board and key board according to the wiring diagram. Press POWER button on the remote control, the indicator light on IR board turns blue, test X12 PIN1 of TV board to be +24V.

3.4.3 AGC adjustment

a) Receive 60dB signal of D-8 and test X07 with DC voltmeter.

b) Adjust RP201 to let the data of voltmeter just below 4.0V.

c) Input 100dB signal of antenna, the picture should not no-synchronous or distortion; the color

should not disappear when input 30dB-40dB low signal and the picture should synchronous and the sound normal.

3.5 VGA adjustment

3.5.1 mode preset

Input VG-848 of VGA signal(PATTERN 980:1 dot ON/OFF), select TIME877(720*400/70Hz), the TV will auto adjust to full screen, or enter display menu to do auto correction. Adjust TIME885(640*480/60Hz,TIME854(800*600/60Hz) by using the same method.

3.5.2 VGA channel Auto color

Input VG848 of VISA mode signal to VGA channel, enter factory menu of Auto Color Setting item, select VGA and press enter to do Auto Color.

3.6 YPbPr Auto Color

Input a high definition signal of VG-848, enter factory menu of Auto Color Setting item, select YPbPr and press enter to do Auto Color.

3.7 AV Auto Color

Input FLUKE VIDEO signal of PAL, select PATTERN of 100% Color bar, enter factory menu of Auto Color Setting item, select VIDEO1 and press enter to do Auto Color.

3.8 SCART Auto Color

Connect SCART1 RGB signal, input FLUKE signal of PAL system, PATTERN of 100% Color bar, enter factory menu of Auto Color Setting item, select SCART1 and press enter to do Auto Color.

4 Performance check

4.1 TV function

Connect RF-TV terminal to the central signal source, enter the search menu→ auto search, check if there is station skipping, manual search, fine tuning, the output of earphone and speaker, the picture are normal.

4.2 SCART/AV/S terminal

Input SCART1(RGB+CVBS)/SCART2(CVBS+YC)/AV/S signal, check if the picture and sound are normal.

4.3 AUDIO OUT/VIDEO OUT terminal

Separate input signal at the status of TV/SCART/AV/S, connect AUDIO/VIDEO OUT to the monitor and check if the sound and the picture of the AUDIO OUT are normal.

4.4 SCART terminal

4.4.1 check the content of SCART OUTPUT

Separate input signal at the status of TV/SCART/AV/S, connect AUDIO/VIDEO OUT to the monitor, check if the picture and sound of SCART1 OUTPUT are the picture and sound of TV when input SCART1(RGB+CVBS) and check if they are normal; check if the picture and sound of SCART2 OUTPUT are the picture and sound of the present signal when input SCART2(CVBS+YC) and check if they are normal.

4.4.2 check the function of SCART INPUT

a) Connect SCART1 and the signal generator after turn on, the TV should auto switch to SCART1

RGB or SCART1 CVBS. Connect SCART2 and the signal generator after turn on, the TV should auto switch to SCART2 CVBS or SCART2 YC.

b) SCART signal generator sends CVBS signal (color bar and multi-burst) to SCART1, check if the

picture is normal, the OSD should be SCART1 VIDEO; the OSD should be SCART1 RGB when SCART1 signal switches to RGB format.

c) SCART signal generator sends CVBS signal (color bar and multi-burst) to SCART2, check if the

picture is normal, the OSD should be SCART2 VIDEO; the OSD should be SCART2 S-VIDEO

when SCART2 signal switches to YC format.

d) Disconnect SCART signal, the unit should return to the present TV situation.

Note: the function is act except VGA, YPBPR, HDMI.

4.5 VGA terminal

Input VGA signal (VG-848 signal generator), separate input VGA format signal of table 1 and check if the picture and sound are normal after auto correction. If the image is interfered, press the auto adjust button on the remote control again and check if it is normal.

Table 1 VGA signal format

No Resolution

640X480 @ 60 885 25.175 31.47 59.94

640X480 @ 72 851 31.500 37.86 85.08

640X480 @ 75 852 31.500 37.50 75.00

640X480 @ 85 334 43.500 43.269 85.00 7253

720X400 @ 70 877 28.320 31.47 70.08

720X400 @ 85 960 35.500 37.93 85.04

800X600 @ 56 853 36.000 35.16 56.25

800X600 @ 60 854 40.000 37.88 60.32

800X600 @ 72 887 50.000 48.08 59.80

800X600 @ 75 945 49.500 49.88 75.00

1024X768 @ 60 856 65.000 48.36 60.00

1024X768 @ 70 857 75.000 56.48 70.07

1024X768 @ 75 858 78.750 60.02 75.03

1280X1024 @ 60 963 108.000 63.98 60.02

1280X1024 @ 75 859 135.000 79.98 75.02

1600X1200 @ 60 859 162.000 75.00 60.00

Picture element

clock (MHz)

H-SYNC(kHz) V-SYNC(Hz) Remark

4.6 YPBPR terminal

Input YPBPR signal (VG848 signal generator), separate input YPBPR format signal of table2 and check if the picture and sound are normal.

Table 2 YPBPR signal format

No Resolution Mode VG848 timing Remark

712X484 @60Hz 480i 968

720X4843@60Hz 480P 978

702X574 @50Hz 576i 969

756X557 @50Hz 576P 979

1280X720@50Hz 720P 50 5 SET

1280X720@60Hz 720P 60 976

1920X1080@50Hz 1080i 50 1 SET

1920X1080@60Hz 1080i 60 972

1920X1080@50Hz 1080P 50

1920X1080@60Hz 1080P 60 970

4.7 HDMI terminal

Input HDMI signal (VG848 signal generator), separate input YPBPR format signal of table1 and table2 and check if the picture and sound are normal.

Check the picture and sound by using VG849 with HDMI terminal.

4.8 DVT-T function check

Connect DVB-T RF terminal to the central signal source, enter the search menu→ auto search, check if it can search the program or there is station skipping, check the output of earphone and speaker, if the picture are normal. Attenuate the signal to 25dBuV(16QAM program) and check the picture and sound.

4.9 Ex-factory preset

Perform “factory reset” of MENU to do ex-factory preset.

5.10 Packing

Check the accessories and pack them in box.

Method of software upgrading

The FY# series models enable you to update software through the serial interface.

Hardware requirements: 1. One serial cable with female end and female end;

2. One PC set;

Steps of software updating are as follows:

1. Install Gprobe 5.0:

The first: Double click the GProbe5[1].0.0.15_S0006-EXE-09A to install it:

According to the prompt of Windows and follow the steps one by one to finish the installation.

The second: Double click the GPorbe5[1].0.0.15Update1_S0006-EXE-10A to install it:

According to the prompt of Windows and follow the steps one by one to finish the installation.

2. Copy the full directory of Isp_fastflash to anywhere

E.g. take the root directory of C:\ as an example for the following explanation:

Copy the updating file *.hex to the directory of C:\ Isp_fastflash\

E.g. C:\ Isp_fastflash\20Y25.hex.

3. Open C:\ Isp_fastflash\Isp_parallel\ bat.txt as follows:

Properly set the path of RAMWrite "C:\isp_fastflash\Isp_parallel\TEMP_OBJECT\isptemp_ parallel.hex"

and FastFlashWrite "C:\isp_fastflash\20y25.hex", save them and close.

4. Set the LCD to off. Connect the Y# updating board and PC with parallel cable.

5. Connect the VGA MONITOR interface on the Y# updating board with the VGA cable, connect the

other end to the VGA interface of the LCD.

6. Turn on the LCD

Double click to run Gprobe5:

Click the icon of :

Set the Device to Parallel.

Then click the item of Delays and Buffer Size:

Set Long to 50000 ms.

Click the item of Parallel:

Set Clock to 120000 Hz

7. Click Batch,

Select the path of the File: bat.txt

Select bat.txt and click to open it:

Click “OK” to start the process of burning the program.

The following screen appears when the process if finished.

If you want to update the software next time, you just need to click the pull-down menu to select the

desired Batch file and execute it in the following screen.

Note: Do not cut off the power or turn off the unit during the burning process, or the flash may be

damaged.

Check the following if you fail to update:

1. Check whether all cables are properly connected. If LCD is turn on.

2. Check the settings of Gprobe.

3. It is wrong if the Gprobe shows as the following icon.

Now just click the icon of

to show below icon.

Block diagram

Working principle analysis of the unit

The unit has two modules: video module and sound module. The diagram is show as fig 1 and fig 2:

Pre-IF SAW

IF IC

Fig1 diagram of video module

Fig2 diagram of sound module

1. Video module There are three kinds of terminal of SCALER FLI8548: A: 16 channel analog signal input B: one group 24BIT digital signal input C: one group HDMI digital signal input

SCART1, SCART2, AV, DVB-T, TV input from terminal A; VGA, YPBPR via switch PI5V330 to ADC CAT9983, after CAT9983 processing output 24BIT DIGITAL DATA to terminal B; HDMI1 and HDMI2 via FSHDMI04 switch directly to terminal C. SCALER FLI8548 has only three ADC of 10BIT(16-rout analog signal via internal MUX switch to three ADC), so the signals(SCART1, SCART2, AV, DVB-T, TV) input to terminal A can’t cooperate to perform PIP each other. The function of PIP can only realize by the signals input from the three terminals(A, B and C). All the signals via FLI8548 processing to the panel directly, the output interface is configurable for single wide TTL, LVDS(18,24 or 30-bit RGB) or dual wide TTL(18, 24-bit RGB), LVDS(18. 24 or 30-bit RGB). FY# use the dual wide LVDS(30-bit RGB) to support the 1080P panel.

2. TV module RF signal via the tuner to output 38.9MHz(L) or 33.5MHz(L’) IF signal, via pre-IF circuit and two SAW to amplify and separate VIF and SIF, then it sent to IF decode IC TDA4470. VIDEO-OUT from TDA4470 via switch HEF4052T select and four filters, output CVBS to FLI8548 image processing. SIF from TDA4471 sent to sound processing IC N03SGTV5830. Diagram of TDA4470 is below:

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