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

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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

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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.

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Alignment instructions

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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

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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

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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

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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

1

640X480 @ 72 851 31.500 37.86 85.08

2

640X480 @ 75 852 31.500 37.50 75.00

3

640X480 @ 85 334 43.500 43.269 85.00 7253

4

720X400 @ 70 877 28.320 31.47 70.08

5

720X400 @ 85 960 35.500 37.93 85.04

6

800X600 @ 56 853 36.000 35.16 56.25

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800X600 @ 60 854 40.000 37.88 60.32

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800X600 @ 72 887 50.000 48.08 59.80

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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

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2

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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

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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:

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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:

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Click the icon of :

Set the Device to Parallel.

Then click the item of Delays and Buffer Size:

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Set Long to 50000 ms.

Click the item of Parallel:

Set Clock to 120000 Hz

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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.

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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.

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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.

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Block diagram

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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

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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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3. Sound module SGTV5830 Multistandard TV Audio Processor
The diagram is below:

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Input pins:
AIN3: AV L/R input AIN4: SCART2 L/R input
AIN5: SCART1 L/R input AIN6: DVB L/R input
AIN8: YPBPR L/R input AIN9: VGA L/R input
I2SAIN: I2S input SIF1: SIF input

SIF is directly sent to SGTV5830 ADC and sound demodulate module (stereo identify), then output
to SSS(SOURCE SELECT SWITCH) to output selection.
L/R of VGA, YPBPR, AV, DVB-T, SCART1 and SCART2 will be sent to SGTV5830 analog input
switcher to output to ADC, then to SSS(SOURCE SELECT SWITCH) to output selection.

Output pins:
MAIN-OUT: MAIN-OUT
HP-OUT: TV-OUT
AOUT0: HP
AOUT1:AV-OUT
AOUT2: SCART1-MONITOR OUT
I2SA-OUT: I2S OUTPUT
All of the sound signal via front-processor to SSS switch, the sound of main channel will output
I2S-OUT to FLI8548 as a signal of SYNC DELAY, then sent back to SSS switch to SGTV5830
digital processing module(DAP), after processing back to SSS switch output.
Note:
a) The reason why AOUT0 act as HP OUT while HP-OUT act as TV-OUT is that when two

channels(two of AV, SCART1, SCART2, DVB, YPBPR and VGA) perform PIP, the main picture

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via ADC and SSS switcher output MAIN-OUT. There is only one channel ADC, the signal can’t
go through another channel HP. When AOUT0 act as HP OUT, it can use “Analog Input Switch”
switch the sound of PIP to AOUT0 and use the earphone sound amplifier to control the volume.

b) The reason why output to FLI8548 a signal of SYNC DELAY is that when process the picture

and sound at the same time, the process of image is much more complex and needs more time,
so they may no-sync. When HDMI act as the main picture and occupy the I2S terminal, SYNC
DELAY is needless.

SGVT5830 output MAIN L/R to sound amplifier MPS7722, then to speaker.

4. Audio amplifier MPS7722

The MPS7722 is a dual ended 20W Class D Audio Amplifier with +24V power supply. It has the
capability of delivering 2X12Ω/20W into 6Ω bass speakers and 1X 6Ω/12W treble speaker.

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Gain (V/V) Gain (dB) R

(KΩ) R

FB

(KΩ) C

IN

FSW V

INT

DD

(V) Remark

17.4 24.8 82 4.7 5.6nF 720KHz 24 FY#

3.9 15.0 39 10 6.8nF 660KHz 12 MPS7722

8.2 18.3 82 10 3.3nF 660KHz 12 MPS7722

8.3 21.5 39 4.7 6.8nF 660KHz 12 MPS7722

17.4 24.8 82 4.7 3.3nF 660KHz 12 MPS7722

5.6 15.0 56 10 8.2nF 670KHz 24 MPS7722

8.2 18.3 82 10 5.6nF 720KHz 24 MPS7722

11.9 21.5 56 4.7 8.2nF 670KHz 24 MPS7722

17.4 24.8 82 4.7 5.6nF 720KHz 24 MPS7722

33.0 30.4 330 10 1.8nF 700KHz 24 MPS7722

5. NJW1109

IN a,b: HP L/R
SCL,SDA: SCL_+5V, SDA_+5V
Out A, B: earphone output
V+:+9V power supply

6. High definition module

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VGA and YPBPR via switch PI5V330 to CAT9983 D/A convert. CAT9983 has a 150M band
width, three groups ADC with 8-bit MICROVISON, support YPBPR 1080P input.
CAT9983

Note: pin COAST and CLAMP connected to ground for auto test.

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7. Digital HDMI module

Two groups HDMI via video switch IC FSHDMI04 to HDMI input port of FLI8548, which
integrated HDMI reception and support digital 1080P input.
FSHDMI04(with ESD) diagram is below:

8. FLI8545 system module

Feature:

 3D comb filter, support multi-system TV signal and MICROVISION
 Integrated triple 10-bit ADC.
 HDMI receiver, support 1080P input, I2S output
 Built-in MCU, GPIP control
 ACC(Adaptive Contrast and Color), ACM(Active Color Management), DCDI(Dynamic

mode test).

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9. Other

 Power control

The unit adopts a PHILP power control IC, which works at standby and the power
consumption below 1W, it also realizes the on time turn off/on.

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 DDR MEEORY

The unit adopts 2 chips 16M*16bit DDR SGRAM of 200M speed, 32-bit of data and 12 bit of
address.

 FLASH and EEPROM

1M*16-bit of FLASH and 64K bit of EEPROM

10. DAP module (include AVC, SRS, TONE CONTROL, EQ ect,.)

11. DVB-T module

turner

crystal

hardware

output

Audio output

Working principle of DVB-T module:

RF signal from cable net received by the tuner is turned into IF signal, via A/D conversion to digital
baseband signal, then it is sent to internal channel decoder COFDM decode, output MPEG-2
multi-media program transmission data (TS stream), the TS stream from TUNER is sent to
ZR3915X demultiplexer, demultiplexer draws up a packaged program base stream from MPEG-2
transport stream(PES), contains video PES, audio PES and assistant data PES. Demultiplexer
contains noninterference engine, which can release interference data of transport layer and PES
layer, the output of demultiplexer is noninterference audio/video PES.
Video PES is sent to ZR3915X demultiplexer, then output MPEG-2 video data, after decode, the
data is sent to PAL/NTSC coder D/A converting into video signal CVBS, Y/C, R/G/B or Y/Cr/Cb,
output from video output circuit.
Audio PES is sent to audio decoder, then output MPEG-2 audio data to decode, it has two kinds of
output interface: PCM output and SPDIF output. PCM output interface is made up of MCLK, LRCLK,
BCLK and AOUT, the output PCM signal needs to D/A conversion. The DAC function is completed
by CS4334.

ZR3915X digital TV decoder

 Transport stream demultiplexer and MPEG-2 decoder: transport stream commonly contains

some audio/video streams and data information. Transport stream demultiplexer is used to
distinguish different programs, distils corresponding audio/video streams and data stream

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and sends to MPEG-2 decoder and analytic software to recover the digital information.

 Video decoder, audio D/A conversion: MPEG-2 decoder decompresses the audio/video signal,

via video coder and audio D/A conversion, recovers analog audio/video signal to display the
high quality image on the analog TV, it also provides multi-channel stereo programs.

 Inlaid CPU, memory module and interface circuit: inlaid CPU is heart of the DVB module, it

and memory are used to store and run software. Control every hardware module. Interface
circuit provides plenty external interfaces: including Guest Bust bus line, general serial
interface, MODEN V90 interface, RS-232, analog/ digital video/audio and data interface ect.

Function of Supra TV ZR3915X:
DVB-T module made up of ZR3915X first distils channel code information from transport layer to
complete channel demodulation, then recovers compressed signal of source code to original
video/audio stream and completes data and multi-application of reception and analytic.

1) Internal block diagram:

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2) pins instructions:
ZR3915X is PQFP packing, 256 pins. Including: power, clock, Guest Bus, SDRAM interface, two
TS stream inputs, 32 GPIO, two SmartCard, Modem V9.0, UART serial interface, controllable
ADC and PWN interface, digital AUDIO interface, analog video output.

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 DDR MEEORY

The unit adopts 2 chips 16M*16bit DDR SGRAM of 200M speed, 32-bit of data and 12 bit of
address.

 FLASH and EEPROM

1M*16-bit of FLASH and 64K bit of EEPROM

10. DAP module (include AVC, SRS, TONE CONTROL, EQ ect,.)

11. Power part

backlight

Rectify

isolation

isolation

audio amplifier

isolation

Working principle of power:
The input AC power via EMC filter and rectification circuit, it sent to PFC(power factor correct L6563)
to output DC400V, which will be separated into two ways, one way via standby circuit (isolation D/D
convert FSDH321) output 5VAND 32V; another way via semi-bridge circuit(TEA1610T) output 24V,
18V, ect. At standby, power board send out Vsb(3.3V) to cut off 5VSC, 32VSC output by the control
of Standby signal and stop working of PFC circuit(L6563) and semi-bridge (TEA1610T). When turn
on, it makes all the IC working and output voltage.
L1653:PFC( power factor correct)
TEA1610T: Isolation D/D convert (400VDC converted to DC 24V, 18V, ect.)
FSDH321: Isolation D/D convert (400VDC converted to DC 5V, 32V, ect.)

FSDH321 block diagram is bellow:

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L6563 block diagram is below:

31

TEA1610T block diagram is below:

32

33

Wiring diagram

backlight

panel

to speaker

power supply of audio amplifier

power supply of TV board

power switch

interface board

TV board

IR receive board

panel

backlight

board

power supply of main board

backlight time sequence control

power supply

panel

control

key board

main board

upgrade board

3

4

Trouble shooting

Before servicing please check to find the possible causes of the troubles according to the table
below.

1.Antenna(signal):

Picture is out of focus or jumping  Bad status in signal receiving

 Poor signal
 Check if there are failures with the electrical connector or

the antenna.

 Check if the antenna is properly connected.

Fringe in picture  Check if the antenna is correctly oriented.

 Maybe there is electric wave reflected from hilltop or

building.

Picture is interfered by stripe
shaped bright spots

There appear streaks or light color
on the screen

2.TV set:

Symptoms Possible cause

Unable to switch the power on  Check to see if the power plug has been inserted

No picture and sound  Check to see if the power supply of liquid crystal TV has

Deterioration of color phase or
color tone

Screen position or size is not

proper

Picture is twisted and deformed  Check to see if the picture-frame ratio is properly set up.

Picture color changed or colorless  Check the “Component” or “RGB” settings of the liquid

 Possibly due to interference from automobile, train, high

voltage transmission line, neon lamp etc.

 Maybe there is interference between antenna and power

supply line. Please try to separate them in a longer
distance.

 Maybe the shielded-layer of signal wire is not connected

properly to the connector.

 Check if interfered by other equipment and if interfered

possibly by the equipment like transmitting antenna, non
professional radio station and cellular phone.

properly into the socket.

been switched on. ( as can be indicated by the red LED
at the front of the TV set)

 See if it’s receiving the signal that is transmitted from

other source than the station

 Check if it’s connected to the wrong terminal or if the

input mode is correct.

 Check if the signal cable connection between video

frequency source and the liquid crystal TV set is correct.

 Check if all the picture setups have been corrected.

 Check is the screen position and size is correctly set up.

crystal TV set and make proper adjustment according to

35

Symptoms Possible cause

the signal types.

Picture too bright and there is
distortion in the brightest area

Picture is whitish or too bright in
the darkest area of the picture

No picture or signal produced from
the displayer if “XXX in search”
appears.

There appears an indication ­“outside the receivable scope)

Remote control cannot work
properly

No picture and sound, but only

hash.

Blur picture  Check if the antenna cable is correctly connected.

No sound  Check if the “mute” audio frequency setting is selected.

When playing VHS picture search
tape, there are lines at the top or
bottom of the picture.

 Check if the contrast setting is too high.
 Possibly the output quality of DVD broadcaster is set too

high.

 It maybe also due to improper terminal connection of the

video frequency signal in a certain position of the
system.

 Check if the setting for the brightness is too high
 Possibly the brightness grade of DVD player

(broadcaster) is set too high.

 Check if the cable is disconnected.
 Check if it’s connected to the proper terminal or if the

input mode is correct.

 Check if the TV set can receive input signal. The signal is

not correctly identified and VGA format is beyond the
specified scope.

 Check if the batteries are installed in the reverse order.
 Check if the battery is effective.
 Check the distance or angle from the monitor.
 Check if there is any obstruct between the remote control

and the TV set.

 Check if the remote control signal- receiving window is

exposed to strong fluorescence.

 Check if the antenna cable is correctly connected, or if it

has received the video signal correctly.

 Of if it has received the right video signal.

 Check if the sound volume is set to minimum.
 Make sure the earphone is not connected.
 Check if the cable connection is loose.

 When being played or in pause VHS picture search tape

sometimes can’t provide stable picture, which may lead
to incorrect display of the liquid crystal TV, In this case
please press “auto” key on the remote control so as to
enable the liquid crystal TV set to recheck the signal and
then to display correct picture signal

36

Troubleshooting guide

N

r

N

N

y

N

d

N

f

t

N

p

y

r

1. Trouble diagnosis of power

2. No DC output

No power

Check if C539

has 5V

Check if C533

has voltage ove

100V

Check the fore

circuit of fuse

and rectifier.

No DC output

(Vsb normal)

Check 32VSC,

5VSC

Check if 24VCF,

24VSC, 18VSC

is normal

Check if the voltage o

C533 is abou

395V(less than 370V is

abnormal)

Check L6563 and its

eriphery (include

the VCC)

o

o

Yes

o

o

Ye s

Ye s

Ye s

Check N503

Check N501 and its periphery (include

transformer and the secondary sample

feedback circuit.

Check the fore

circuit

Ye s

o

Ye s

Check if Standb

is high level

Check N504 an

the correlative

circuit

Check N512 and its peripher

(include VCC, transforme

and the secondary sample

feedback circuit)

37

o

Check the

correlative circuit

3. DTV part

d

f

f

orma

m

N

N

N

N

y

p

p

p

DTV fails to work properly

① no respondence when switch to DTV

Check the power

supply of DVB-T

Refer to checking

rocedure (2)

Begin

Ye s

Switch to DTV an

display picture

Ye s

Check if the picture of

DTV or STAND-BY is

n

l

Ye s

If DVB-T progra

is normal?

o respondence when switch to DTV

J06 pin 1GPIO

should be high level

Check power supply of power board, i

o

J06 pin1 is high level, check crystal o

DVB-T and frequency of SDRAM CLK

Check if YUV of J03 DVB-T module

o

output is normal

Check if RF input signal is normal, TS

o

stream of TUNER has output

If main chip

works normall

If DTV image is

normal

Refer to checking

rocedure (3)

Refer to checking

rocedure (4)

38

d

b

d

b

f

f

② DVB-T power supply abnormal

U10 pin4 should

be 5V

③ main chip works abnormal

④ DTV image abnormal

DVB-T power supply abnormal

Check the power supply of power board

U7 pin4 shoul

Main chip of DVB-T

works abnormal

If work frequency of

crystal Y1 is 20.25MHz

The frequency of R15

should be 129.6MHz

Check if flash write

the correct software

DTV image o

DVB-T abnormal

Check if J03 wave o

video output is normal

The work frequency of crystal Y1

should be 20.25MHz, ±20ppm error

e 3.3V

39

U6 pin4 shoul

e 1.8V

p

t

p

m

f

⑤ DTV can’t search the program

⑥ DTV no audio output

DVB-T can’t search

the program

If tuner RF is well

connected

Check if RF receives

rogram signal

Check if each outpu

in of TS is normal

Check if flash write

the correct software

If audio connection wire

of DVB-T is well

Check if flash write

the correct software

DVB-T no audio

output

Check if progra

setting is correct

Check if each pin o

J02 is normal

40

t

p

f

d

r

r

f

r

m

d

r

N

d

p

R

N

N

y

V

N

N

N

N

No N

k

Check if the speakers wor

normal at other channel

Check if flash write

the correct software

4. Representative symptoms

(1) no picture, no sound, no raster

Check if the

indicator ligh

turns red when

ower on

o

Check if +3.3V-stby o

XB7 9# on main boar

is normal

o

Power board no output o

+3.3V-stby short to the

ground

Yes

Ye s

IR board has problem.

Indicator light is damaged

If indicato

light turns blue

when turn on

o

Check +9V o

XB7 1# on main

board

o

Power board no output o

+9V short to the ground

Yes

Check XB7

+5V of 3# an

+18V of 5#

Yes

Ye s

Check the powe

supply of main

CPU,DDR(CB47

-3.3V,CS80-1.8V,

C434-2.5V)

There is proble

lie in IR board

B10，NS03，N404 an

their periphery have

roblem

o

Power board no

output or +5V, +18

short to the ground

Ye s

Main CPU NS02, DD

400&N402, FLASH

A02 or their peripher

have problem

41

(2) with sound but no picture

f

r

N

y

y

N

p

p

t

r

d

N

N

N

N

N

N

Check i

backlight is light

Yes

LVDS power suppl

of C415 is normal?

o

403 and its

eriphery has

roblem

Yes

Problem lies in LVDS

wire or panel

(3) with picture but no sound

a) MP7722

If audio amplifier has

output (if X13 has wave)

o

If sound processing IC has

output (C116,C117)

Sound processing IC N03 an

its periphery has problem

o

o

Check the powe

supply of backlight

Ye s

XB12 3# switch level is abnormal

(such as shortage)

If X403 has LVDS wave

output

Speaker damaged

Ye s

Audio amplifier and the circui

has problem. Check the powe

supply, 6# MUTE, 14#,19#

o

o backlight power suppl

output or short to the ground

o

Main CPU NS02

LVDS have problem

42

b) TPA3001

d

r

n

p

m

N

t

t

p

t

N

t

r

N

t

N

N

N

N

N

If audio amplifie

output (X12, X13)

Speaker

o

If sound processing IC

has output (C27, C29)

Sound processing IC N03 an

its periphery has problem

o

Ye s

Audio amplifier and the circuit has problem.

Check the power supply, 6# MUTE. Turn o

again after power off and check if the audio

amplifier protection.

The output of TPA3001 is differential output, so when check X12, X13 output signal with
oscilloscope, please use the power cord with two pins, otherwise, it may damage the audio
amplifier.

(4) a certain channel abnormal

a) AV no picture

If X09 4# inpu

signal

Yes

o

S02 or the periphery circui

of AV input have problem

The path from AV terminal

to this socket has

roble

b) TV no picture

If X09 4# inpu

signal

Ye s

o

S02 or the periphery circui

of TV input have problem

If N04 12# of TV board has

out

ut signal

Ye s

o

04 emitter-follow circui

and N07 has problem

TUNER01or the periphery of N04

has problem. The emphasis is powe

supply.

43

r

N

d

n

N

d

r

N

y

N

p

N

N

N

N

c) SCART1 no picture

Check if X203 1#(CVBS) o

3#,4#,5#(RGB) on SCART

board has signal?

Ye s

o

S02 or the circuit aroun

SCART1 input has problem

The path from SCART1

socket to X203 has problem

d) SCART2

Check if X203 7# o

SCART board has signal?

Yes

o

S02 or the circuit aroun

SCART1 input has problem

The path from SCART2

socket to X203 has problem

e) YUV no picture

If RA26 input signal?

Yes

o

A03 and its

eriphery has problem

Check if NA01 5# has

signal

The path between YPbP

socket and NA01 has problem

Ye s

A01 or the peripher

has problem

o

44

n

w

prog

)

t

N

y

t

N

p

m

A

Y

p

N

d

N

y

p

p

N

N

N

N

No N

f) D-Sub no picture

If it is normal whe

input YPbPr signal

Ye s

o

If RA20, RA21 inpu

sync signal

Check follo

ram (e

Ye s

o

A03 and its peripher

has problem

If NB14 1#, 4# inpu

sync signal

Ye s

o

B14 and its

eriphery has proble

The path between VG

and NB14 has problem

g) HDMI no picture

If one channel HDMI no

icture

Ye s

The path from NB14 or HDMI

socket to NB14 has

roblem

Check if HDCP KE

flash written.

o

Yes

o

If NB13 pin 28, 30, 33, 35, 38, 40, 43,

45out

ut signal

Yes

Write HDCP KEY

S02 or the circuit aroun

HDMI input has problem

B14 or its peripher

has problem

45

IR KEY

decode

high frequency

connection

APPENDIX-A: Main assembly

LCD-42XR7H

NAME NO.

Power board XI6FN0052010
Main board XI6FY0050110
Connection board XI6FY0052910
Video processing board XI6FY0054010
Key board XI6FY0140510
IR board XI6FY0140910
SCART connection board XI6FY0144610
Remote control XI6010J01101
Panel XI5203428503

PART LIST OF EXPLODED VIEW (LCD-42XR7H)

NO.

1
2
3
4
5
6
7
8

9
10
11
12 Power Switch

13

14

DESCRIPTION

Front cover
Infrared receiving board
Screen
Analog board
Main board
Key board
Speaker
Power board
Trans-connecting board
Back cabinet
Stand

User manual
Remote Control

PARTS LIST

LCD‑42XR7H

REF.No. PARTS No. DE S CR IPTION Q'TY REMAR K
1 XI5Q232L002A 1
2 XI6FY0140910 1
3 1
4 XI6FY0050110 Main Board 1
5 XI6FY0140510 1
6 XI5H232LJ03A 1
7 XI6170728010 S peaker(Bottom) 1
8 XI6151073630 S tand 1
9 XI6FY0052910 Trans-Connecting Board 1
10 XI6FY0054010 Analog Board 1
11 XI6FN0052010 Power Board 1
12 XI5293000042 Power Switch 1
13 XI5944029170 User Manual 1
14 XI6010J01101 R emote Control 1

* Only the parts in above list are used for repairing.
* Other parts except the above parts can't be supplied.

ver.1.0

Front Cover

Infrared R eceiving Board
Screen

Key Board

Back Cabinet

CMO V420H1-L07

Aug./’07

Jun/2007/30 CPS