Sanyo 22XR8DA Schematic

FILE NO.

SERVICE MANUAL LCD-22XR8DA

PRODUCT CODE No.

PRODUCT CODE No.

LCD TV

1 682 345 34: CCIR DVB-T

REFERENCE No.:SM0915033

CONTENTS

Safety precautions………………………………………………………………………..…
Alignment instructions …………………………….…….…………………………………
Method of software upgrading……………………………………………………………..
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

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, connections 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 dagmage.

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:

o

Temperature Scope for operation 0 ~ +50

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

k

k

1. Test equipment

VG-848 (YPbPr,VGA signal generator)
VG-849 (HDMI signal generator)
CA210 (white balancer)

2. Power test

Connect power board, digital processing board, IR board and backlight board according the wiring

diagram, connect the power and press
Test the pin voltage of X401, the data is shown in table1:

X401 Pin1 2 3 4 5, 6 7, 8 9 10 11 12 13

Voltage 5V±5% 0 5V±5% 0 12V±5% 0 ≤3.3V ≤5V ≤3.3V 32V±5% 0

3. Alignment flow-chart

The alignment flow-chart is shown as fig-1

Input Component signal and check the function of YPbPr

Input D-SUB signal and check if the display is normal, chec

the function (analog control), horizontal/vertical center, etc.

Input HDMI signal and check if the display is normal, chec

the function (analog control), horizontal/vertical center, etc.

Check if EDIT, HDCP KEY, FLASH are written

Combined test for general assembly

Connect to the center signal source and check each

function of TV (station leaking, analog control, etc.)

check the output of earphone and speaker.

Input AV signal and check the function

Check the other functions (LCN, OTA)

to turn on the TV.

Table1 voltage data of X401

White balance adjustment

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Preset ex-factory

Fig-1 adjustment flow-chart

4. Adjustment instruction

4.1 Unit adjustments

4.1.1Connect all the boards according to wiring diagram, then power on and observe the display.

4.1.2 Method for entering factory menu:
a) Press “SOURCE”, “2”, “5”, ”8” and “0” in turn to enter factory menu;
b) Press “” and “” to move the cursor to the adjustment page of the level one factory menu,

then press ”OK” to enter;
c) Press “” and “” to move the cursor up and down;
d) Press “” and “” to adjust the item when the cursor move to a certain adjust item;
e) Press “MENU” to exit to the previous factory menu;
f) Press “EXIT” to exit the factory menu at any situation;
g) Press “OK” to enter the sub factory menu;
h) ADC ADJUST, ADC correction of VGA, Component channel;
i) W/B ADJUST, white balance adjustment;
j) POWER MODE, set the turn-on modes. Standby---standby when power on; Mem---memory;

ForceOn---power on; ForceOn can be used for aging; set the “power mode” to “Standby” when

preset ex-factory unless the client appointed it;
k) ISP MODE, ON---soft upgrading through VGA port with ISP instrument, OFF---DDC function of

VGA; the setting will not be memory and will be “OFF” when power on again;
l) RESTALL, initialization of the factory and user data; after this item is confirm, the unit will restart

and display the guiding image.
m) FACTORYDATAREST, factory data initialization (including white balance adjustment, ADC

correction and other adjusted data);
n) FACEORY Channel PRESET, preset the factory channel; please connect to the center signal

source when operating; the present digital frequency is CH28(529.5MHz), CH33(564.5MHz) for

Australia, if the signal changes, perform “DTV manual search” in “Channel” menu and the

operation needs 15s or so.
o) CUSTOM Channel PRESET, preset the custom ATV channel, they are CH2(66.5MHz),

CH7(184.5MHz), CH9(198.5MHz), CH10(212.5MHz), CH28(529.5MHz);
p) MST DEBUG, the default is OFF. OFF---RS-232 should match the design criterion; ON--- it

should be convenient for using exploitation tool to adjust. The setting will not be memory and will

be “OFF” when power on again;
q) BACKLIGHT: adjust the backlight brightness, adjust the data and test the voltage of X804 pin2

(PWM), let the voltage to be the corresponding PWM voltage which the brightness is maximum.

It will be preset and doesn’t need adjust.
r) SSC ADJUST, adjust the frequency spectrum expand, it will be preset and doesn’t need adjust.
s) AUDIO CURVE, adjust the sound curve, it will be preset and doesn’t need adjust.
t) RF AGC delay Adj, adjust ATV RF AGC-take;
u) There is data in EEPROM after software upgrade, please perform REST ALL before the first

adjustment.

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4.1.3 ADC correction in D-SUB channel
a) Switch to D-SUB channel
b) Press” SOURCE”, then press “2, 5, 8, 0” in turn to enter the level one factory menu.
c) Move the cursor to “ADC ADJUST” and press OK to enter the sub-menu.
d) Input D-SUB signal (VG-848 Timing:856(1024x768/60Hz), Pattern:920 8step Gray). Move the

cursor to “MODE”, press and  to select “RGB”, move the cursor to “AUTO ADC” and press

OK to adjust automatically till display “success”.

4.1.4 ADC correction of Component channel
a) Switch to Component channel.
b) Press” SOURCE”, then press “2, 5, 8, 0” in turn to enter the level one factory menu.
c) Move the cursor to “ADC ADJUST” and press OK to enter the sub-menu.
d) Input Component signal (VG-848 Timing:969(PAL), Pattern:918 100% color bar). Move the

cursor to “MODE”, press and  to select “YPbPr(SD)”, move the cursor to “AUTO ADC” and

press OK to adjust automatically till display “success”.
e) Input Component signal (VG-848 Timing:972(1080i), Pattern:918 100% color bar). Move the

cursor to “MODE”, press and  to select “YPbPr(HD)”, move the cursor to “AUTO ADC” and

press OK to adjust automatically till display “success”.

4.2 White balance adjustment
The default of color temperature of COOL is 12000K and the coordinate is (272, 278); color
temperature of NORMAL is 9300K and the coordinate is (285,293), color temperature of WARM is
6500K and the coordinate is (313,329).

4.3 Adjustment steps

Before the white balance adjustment, please let the unit working at least 30 minutes and at a
stable situation, use BBY channel of the white balancer CA-210 (19” for example).
a) Switch to HDMI channel;
b) Press” SOURCE”, then press “2, 5, 8, 0” in turn to enter the level one factory menu.
c) Move the cursor to “W/B ADJUST” and press OK to enter the sub-menu.
d) Input HDMI signal (VG-848 Timing:856(1024X768/60Hz), Pattern:921 16 step Gray). Move the

cursor to “MODE”, press and  to select “HDMI”, move the cursor to “TEMPERTURE” and
press and  to select “COOL”.

e) Fix G GAIN, adjust R GAIN, B GAIN and let the color coordinate of the thirteenth scale be

(272,278).

f) Fix G OFFSET, adjust R OFFSET, B OFFSET and let the color coordinate of the forth scale be

(272,278).

g) When adjusting, please keep the color temperature of high light to be X=272±5, Y=278±15 and

the low light to be X=272±8, Y=278±30;
h) Move the cursor to “COPY ALL” and copy the data to the other channels (except DTV);
i) Check if the color temperatures of NORMAL and WARM are up to the mustard (NORMAL high

light acceptable error: x±10, y±15, NORMAL low light acceptable error: x±10, y±25; WARM high

light and low light acceptable error: x±10, y±10), if not, adjust R-GAIN/B-GAIN/R-OFF/B-OFF.
j) Check the white balance of other channels, if they are not up to the mustard then adjust and

store the data separately.
k) Select DTV channel and 16-level gray scale signal.
l) Press “SOURCE” and “2, 5, 8, 0” one by one to enter the level one factory menu.
m) Move the cursor to “W/B ADJUST” and press OK to enter the sub-menu.

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n) Move the cursor to “MODE”, pressand to select “DTV”, move the cursor to “TEMPERTURE”

and press and  to select “COOL”.
o) Repeat the steps e)-I);
p) After adjustment, check if the pictures are normal.
q) The reference of adjustment rule is below:

B gun: lower B gun to increase X, Y coordinate data, while raise B gun to decrease the data;

R gun: raise R gun to increase X coordinate data, while lower R gun to decrease the data; (R

gun adjustment will affect X and Lv slightly)

G gun: raise G gun to increase Y coordinate data, while lower G gun to decrease the data; (G

gun adjustment will affect Y and Lv greatly)

5. Performance check

5.1 TV function
Connect RF to the center signal source, enter Channel menu → auto search, check if there are
channels be skipped, check if the picture and speaker are normal.

5.2 AV terminals
Input AV signal, check if the picture and sound are normal.

5.3 Component terminal
Input Component signal (VG-848 signal generator), separately input the Component signals listed
in table2 and check if the display and sound are normal at any situation (power on, channel switch
and format switch, etc.)

Table2 Component signal format

No. Resolution

1 72×480 15.734 60 13.5 480i (NTSC)

2 720×480 15.734 59.94 13.5 480i (NTSC)

3 720×576 15.625 50 13.5 576i (PAL)

4 720×480 31.469 60 27 480p (NTSC PROG)

5 720×480 31.469 59.94 27 480p (NTSC PROG)

6 720×576 31.25 50 27 576p (PAL PROG)

7 1280×720 45 59.94 74.18 720p (59p)

8 1280×720 45 60 74.25 720p (60p)

9 1280×720 37.5 50 74.25 720p (50p)

10 1920×1080 33.75 59.94 74.25 1080i (59i)

11 1920×1080 33.75 60 74.25 1080i (60i)

12 1920×1080 28.125 50 74.25 1080i (50i)

13 1920×1080 67.5 59.94 148.35 1080p (59p)

14 1920×1080 67.5 60 148.5 1080p (60p)

15 1920×1080 56.25 50 148.5 1080p (50p)

16 1920×1080 33.75 30 74.25 1080p (30p)

17 1920×1080 33.716 29.97 74.176 1080p (29.97p)

18 1920×1080 28.125 25 74.25 1080p (25p)

19 1920×1080 27 24 74.25 1080p (24p)

20 1920×1080 26.973 23.98 74.176 1080p (23.98p)

H-frequecny

(kHz)

V-frequecny

(kHz)

Point clock pulse

frequecny (MHz)

Note

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5.4 D-SUB terminal
Input D-SUB signal (VG-848 signal generator), separately input the signals listed in table3 and
check the display and sound. If the image is deflection of the Horizontal and vertical, select
Picture->Screen->Auto Adjusting to perform auto-correct.

Table3 D-SUB signal format

No. Resolution

1 640×480 31.469 59.94 25.175 IBM

2 720×400 31.469 70.086 28.322 IBM

3 640×480 37.861 72.809 31.5 VESA

4 640×480 37.5 75 31.5 VESA

5 800×600 35.156 56.25 36 VESA

6 800×600 37.879 60.317 40 VESA

7 800×600 48.077 72.188 50 VESA

8 800×600 46.875 75 49.5 VESA

9 1024×768 48.363 60.004 65 VESA

10 1024×768 56.476 70.069 75 VESA

11 1024×768 60.023 75.029 78.75 VESA

12 1152×864 67.5 75 108 VESA

13 1280×960 60 60 108 VESA

14 1280×1024 63.98 60.02 108 VESA

15 1280×1024 80 75 135 SXGA

16 1360×768 47.7 60 85.5 WXGA

17 1440×900 55.9 60 106.5 WXGA+

18 1400×1050 65.22 60 122.61 SXGA+

19 1680×1050 65.3 60 146.25 WSXGA+

H-frequecny

(kHz)

V-frequecny (kHz)

Point clock pulse

frequecny (MHz)

Note

5.5 HDMI terminal
Input HDMI signal (VG-849 signal generator), separately input the signals listed in table2 and table3
and check the display and sound (32KHz, 44.1KHz, 48KHz) at any situation (power on, channel
switch and format switch, etc.)

5.6 other functions check
a) Check the turn on/turn off timer, asleep timer, picture/sound mode, OSD, stereo and digital

sound port, etc.
b) Check the digital program, if Audio Only is normal.

c) Check logical channel number (LCN) for Australia.

d) Check OTA function for Australia special custom.

6. Presetting before ex-factory

Enter user menu LOCK page, select “Restore Factory Default” to preset the ex-factory.
a) Clear the program information
b) Clear VCHIP, parental control, etc.
c) Set the default data of user menu

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d) Set Menu Language to English
e) Set Power on Mode to Off

7. Software instruction

Table4 software instruction

No. Code No. Type Function Burn before

paste

N102

N105 5272404002 AT24C04 HDCP KEY Yes

N202 5272402002 AT24C02 HDMI EDID Yes

N206 5272402002 AT24C02 VGA EDID Yes

5272532003 or

5272532004

EN25B32-100HIP or

W25X32VSSIG-E

FLASH

Yes Written with instrument

Method

like ALL11, write-protect,

refer to note.

Written with instrument

like ALL11

Note: write-protect setting: enter ALL-100 interface, select Config and press “config setting”, set
Protect to “All Protect”, select “config” when burning. The “write-protect” will be set again when
ALL-100 program restart.

Method of software upgrading

Install FTC100103(MSTAR) before writing.
Using Mstar writing-tool on line.

1. Click Connect menu, if it displays DEVICE EN25B32 as shown in fig1, the connection is

success, if displays “can’t Entry ISP Mode” shown in fig2, it needs connect again.

Fig1

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Fig2

2. Open the tool and click Device and select EN25B32.

Fig3

3. Click “Read” and select the file written (MERGE.bin for example) as shown in fig4.

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Fig4

4. Click “Auto”, select “All chip” and “programme” and click “Run” to begin writing.

Fig5

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Fig6
If the process of “Erasing…” finishes soon and begins to “Programing”, that means Flash hasn’t
been erased, please press “Stop” then press” Run”.

5. If the process of writing succeeds, it will display “Pass” near “Run”, otherwise, it is fault and

needs writing again.

Fig7

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Working principle analysis of the unit

1. PAL/SECAM signal flow:
Antenna reception PAL/SECAM signal will be send to tuner TDA1616, which contains frequency
turning, HF and IF amplifier circuit and is controlled by master control IC MSD119 (comprises CPU)
through I2C bus. The analog IF signal via intermediate frequency amplifying, video SAW filter
K3953 and audio SAW filter K9656 to input to analog demodulate IC (IF) R2A10406NP, after
demodulating and output standard video signal TV-CVBS and sound IF signal (SIF).
TV-CVBS will send to the master control IC MSD119 to video decode, deinterlace and scale, then
output LVDS level drive for LCD panel.
The sound IF (SIF) will be fed into MSD119, after demodulating, pre-amplifying, bass adjusting and
volume control, the sound signal will separate into L/R channels and input to operational amplifier
AZ4558 amplifying, then output two ways. One way will be sent to earphone, another will be sent to
class AB sound amplifier TDA7266SA amplifying then sent to speaker.

2. DVB-T signal flow:
Antenna reception DVB-T signal will be sent to tuner TDA1616, after frequency tuning, HF
amplification, IF amplification and SAW FILTER, output IF signal to demodulation chip CE6353, via
QAM demodulation, fed to MSD119 for information source decoding in the format of standard serial
TS stream.
HD video signal via decoding to A/D conversion and OSD superposition, at last output LVDS drive
level for panel display.
HD audio signal via decoder built-in MSD119, resumed to multi- channel sound of Dolby AC-3. The
audio signal will be sent to back end to perform bass adjustment and volume control, then it will
separate into L/R channels and input to operational amplifier AZ4558 amplifying, another way will
be sent to class AB sound amplifier TDA7266SA amplifying then sent to speaker.

3. AV signal flow
AV signal will be fed to MSD119 to perform video decode, deinterlace and scale, then output LVDS
drive level for panel display.
Audio signal from AV via matched resistance, is directly sent to MSD119 to bass adjust and volume
control, the sound signal will separate into L/R channels and input to operational amplifier AZ4558
amplifying, then output two ways. One way will be sent to earphone, another will be sent to class AB
sound amplifier TDA7266SA amplifying then sent to speaker.

4. PC/YPrPb signal flow
PC and YPbPr signal will be sent to MSD119 A/D conversion, output R/G/B of 24 bit to back end
module to digital decode, image scale and OSD superposition, then send to LVDS level drive for
panel display. Sound signal of PC/YPrPb via matched resistance and a-c couple to MSD119 to bass
adjust and volume control, the sound signal will separate into L/R channels and input to operational
amplifier AZ4558 amplifying, another will be sent to class AB sound amplifier TDA7266SA
amplifying then sent to speaker.

5. HDMI signal flow
HDMI video signal is directly fed to the master control IC MSD119 to digital decode, image scale

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