Sanyo LCD-47XR9KH Schematic

FILE NO.

SERVICE MANUAL

LCD TV

LCD-47XR9KH

PRODUCT CODE No.

PRODUCT CODE No.
1 682 348 54: PAL/SECAM

NTSC(AV)

REFERENCE No.:SM0915076

CONTENTS

Safety precautions………………………………………………………………………..…

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

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

Block diagram…………………………………..………………………………….…………

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

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

Troubleshooting guide ………………………………………………………………..……

Schematic diagram…………………………………………………………………………

APPENDIX-A: Assembly list

APPENDIX-B: Exploded View

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

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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 static. 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.

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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
damage.

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

o

C

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

PM5518 (video signal generator)
VG-848 (VGA and HDMI signal generator)
CA210 (color analyzer)

2 Alignment flow-chart

The alignment flow-chart is shown as fig-1

IF channel AFT voltage of TV and AGC voltage adjustment

Check DDC, HDCP KEY, FLASH

Combined test for general assembly

Factory initialization setup

White balance adjustment

Fig-1 adjustment flow-chart

3 Unit adjustments

Connect all the boards according to wiring diagram, connect with power and observe the display.
Method for entering factory menu: press “INPUT”, “2”, “5”, ”8” and “0” in turn to enter factory
menu; press “CH+” and “CH-” to select adjustment items and press “VOL+” and “VOL-” to adjust
value items, press “MENU” repeatedly to exit.

3.1 Initialization
Enter factory menu, select “OPTION” and “HOTEL OPTION” sub-menu, adjustment of items to see
table1.

Table1 sub-menu adjustment

Items Preset Introduce

HOTEL 0 1: HOTEL OPTION of factory menu is optional

LOGO 1 1: display LOGO in no signal or turn on

ADC PRESCALE 00A adjust according the power consumption

Performance check

Preset ex-factory

0: HOTEL OPTION of factory menu is not optional

0: no LOGO display

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SIF PRESCALE 000 adjust according the power consumption

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BACK LIGHT 28 Adjust according the screen

ALL COLOR 1 1: white balance of each channel auto offset based on the HDMI white

balance

0: white balance of each channel adjust the offset base separately

ISP 0 0: no upgrade on line

1: upgrade on line

NO STANDY 00 01: turn on 00: memory function of turn on 10: standby

INIT VOLUME 0-100 Volume when turn on

INIT CHANNEL 1-200 Channel when turn on

INIT SRC Program source Input Source when turn on

EEPROM-MEMORAY

RECALL

> EEPROM Initialization (operate when EEPROM data chaos)

3.2 Adjustment for AFT and AGC of IF channel in TV

3.2.1 IF AFT adjustment
Disconnect J601(B face), input 80dB 38.9MHz PAL signal to the pole of J601 near the socket,
adjust L604 to value 1.65V of TP602, enter the factory menu, set TDA4470 from BG to LL and input
80dB 33.9MHz SECAM signal, adjust RP602 to value 1.65V of TP602, then weld J601.

3.2.2 IF AGC adjustment
Input 184.25MHz RF signal of 60dB to RF terminal, adjust RP601 to value 4V of TP604, and there
should be no obvious snowy picture. Increase the input signal to 90dBV and it should be no obvious
noisy.

3.3 White balance adjustment

3.3.1 HDMI white balance adjustment
a. Input VG-848 signal to HDMI: TIMING854(800*600/60Hz)of PAT920 8 gray scale signal,

adjust the balance with CA210.

b. Enter COLOR TEMP sub menu and select color temperature of standard (9300K), the

value of coordinate is recommended.

c. Fixed B GAIN, adjust R GAIN, G GAIN to let the color coordinate of the seventh level be
(285,293); Fixed BOFF, adjust R OFF, G OFF to let the color coordinate of the second level be
(285,293) and the brightness is about 3nit-10nit. Repeat adjust R GAIN, G GAIN, R OFF and G OFF,
until the color coordinate of the two level gray scale be (285,293).

3.3.2 VGA/YPbPr/ AV white balance check and correct

a. Connect VG-848 signal of VGA to VGA terminal and input TIMING854 (800*600/60HZ)
(PATTERN: CROSS), and auto adjust to full screen then input PAT948 white and black signal, enter
submenu of ADC ADJ, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels),
check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according the
method of 3.3.1

b. connect VG-848 YPbPr signal to YPbPr terminal and input TIMING972(1080I/60Hz) PAT908
color bar(include back/white bars), enter submenu of ADC ADJ, select AUTOTUNE and wait for OK
display. Input PAT920(8 gray levels), check if the white balance is normal, if not, set ALL COLOR to
0 and fine adjust according the method of 3.3.2

c. Input AV signal(PM5518,8 gray scale) to VIDEO terminal and check if the white balance is

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normal, if not, set ALL COLOR to 0 and fine adjust according the method of 3.3.2.

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Note: it can’t set back to 1 once ALL COLOR changes to 0.

4. Software upgrading:

Enter factory menu and select “OPTION”, set ISP to 1 and you can upgrade the software on line.
After upgrade, it needs to set ISP back to 0. if it can not display the image during the upgrading, join
J201 on main board, then perform the upgrading, when upgrade finish, disconnect J201 again.

5 Performance check

5.1 TV function
Enter searching menu ĺ auto search, connect RF-TV terminal with central signal source and check
if the picture is normal, if there are channels be skipped. Check TXT and parental control function.

5.2 AV/S, YPbPr terminals
Input AV/S, YPbPr / YCbCr HD signals, check if it is normal.

5.3 VGA terminal
Insert VGA terminal, input VGA format signal of 640X480@60 Hz and check if the display is normal.

5.4 HDMI terminal
Insert HDMI terminal, input 640X480@60Hz signal, check if the display is normal. Check HDCP
function.

5.5 check sound channel
Check the speaker and earphone of each channel.

5.6 RS232 terminal
Insert the earphone wire to COM port, check the long-distance control function with special test
software.

5.7 other function check
Check the asleep timer, picture/sound mode, OSD, freeze/mute, stereo, etc.

5.8 presetting before ex-factory

Item Setting Item Setting Item Setting

PICTURE MODE STANDARD

COLOR MODE NORMAL

AFC ON SLEEP TIMER OFF OSD VPOSITION 50

ZOOM FULL TTX LANGUAGE WEST OSD HALFTONE 50

SOUND MODE STANDARD OSD DURATION 15

AVC OFF

BALANCE

VOLUME

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50

OSD LANGUAGE

OSD HPOSITION

English

50

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Working principle analysis of the unit

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The RF signal received by antenna will be sent to tuner TUN601, then IF signal will be obtained
through high amplified and mixed frequency. After pre-intermediate amplified by V608, it will be sent
to acoustic surface-wave Z605 to do IF filter and get better IF characteristics, then it will be sent to
N602 (TDA4470) to do intermediate amplification, phase-lock loop VCO and synchronous wave
detection to get the video signal TV-V; after pre-intermediate amplification IF will also be sent to
acoustic surface-wave Z604 to do filter at the same time, the it will be sent to N404 to do
intermediate amplification and output the second sound intermediate frequency signal TV-SIF.

TV-V output from TDA4470 and TV-SIF will be sent to the main IC N304(MST9E89DL)

Video and audio signals of AV/S, VGA, YPbPr will be sent to MST9E89DL too.

3 groups HDMI after PS321 selecting, their video and audio signal will be sent to MST9E89DL.

RGB of SCART1, AV, S-Y and S-C of SCART2 will also be sent to MST9E89DL, their audio
signal and YPbPr, AV/S audio signal via audio switch HEF4052BT selection to MST9E89DL.

The main IC N304(MST9E89DL) is a high performance and fully integrated IC, which can
realize HDMI interface processing, video decoding, video switch selection, A/D and D/A conversion,
interlace/de-interlace processing, modes conversion, OSD and low-voltage differential output, etc.
And it also has functions of audio selection, processing and MCU.

The video signal via MST9E89DL processing, output 4 pairs differential signal and 1 pair clock
signal for LCD panel display. TV-V from TDA4470 after video double amplifying and sent to
SCART1 as AV-OUT. AV processed by MST9E89DL after quadruple amplifying and output as
AV-OUT and SCART2 AV-OUT.

The audio signal via MST9E89DL processing, it will be sent to N206 (BH3547F) amplifying to
earphone. The audio signal will also sent to sound amplifier N203 (TPA3120-D2) amplifying to
speaker. TV-L/R processed by MST9E89DL will be sent to SCART1 for AV-OUT, at the same time,
TV-L/R and AV-L/R will output together as the audio output of AV-OUT and SCART2 AV-OUT.

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Block diagram

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HDMI 1/2/3

VGA
L/R-VGA
YPbPr
(DTV)

SCART1-RGB
SCART1-AV
SCART1-L/R
SCART2-L/R
L/R-YPbPr
L/R-AV/S
SCART2-Y

SCART2-C

AV

S-VIDEO

EDID
24C02

PS321

AUDIO SW.
HEF4052

EDID
24C02

LCD TV
CONTROLLER

MST9E89DL

DDR

FLASH

EEPROM

HDCP KEY

PANEL

AUDIO AMP .
BH3547F

TUNER

TV-V

AV-L/ R

SCART1-V OUT TV-L/R

AV-L/R OUT

AV OUT CVBS

SCART2-V OUT

SAW

IF AMP
TDA4470

4*AMP

TV-SIF

2*AMP

TV-L/R

AUDIO AMP .

TPA3120D2

SCART2-L/R OUT

SCART1-L/R OUT

EAR PHONE

SPEAKER

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IC block diagram

1. MST9E89DL

The MST9E89DL is a high performance and fully integrated IC for multi-function LCD monitor/TV
with resolutions up to full HD (1920x1080). It is configured with an integrated triple-ADC/PLL, an
integrated DVI/HDCP/HDMI receiver, a multi-standard TV video and audio decoder, two video
de-interlacers, two scaling engines, the MStarACE-3 color engine, an on-screen display controller,
an 8-bit MCU and a built-in output panel interface. By use of external frame buffer, PIP/POP is
provided for multimedia applications Furthermore, 3-Dvideo decoding and processing are fulfilled
for high-quality TV applications. To further reduce system costs, the MST9E89DL also integrates
intelligent power management control capability for green-mode requirements and spread-spectrum

support for EMI management.

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2. TDA4470

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