AOC L22W631 User manual

22’’ LCD TV AOC L22W631
1
Service
Service
Service
Horizontal Frequency
31.5-80 kHz
TABLE OF CONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
R FOR TH
UNIT WHEN S
CI
Table Of Contents.......……..............................…........1
Revision List.…........................................……...... 3
Important Safety Notice.......................................……......2
1. General Specification..............................………........4
2. Operating Instructions…………………….……….......5
2.1. The Use Of Remote Control…….………….…….......5
2.2. To Use The Menu…...…………………….……….......6
2.3. How To Connect…….…………………….……….....10
2.4. Front Panel Control Knobs……………….……….....12
3. Input/Output Specification…………....................…....13
4. Mechanical Instructions…………………….................16
5. Repair Flow Chart ……………………….…….…….....19
6. PCB Layout ………………..………………....….......25
6.1.Main Board…………..………….……….......25
6.2.Power Board……………..………….……….......28
6.3.Tuner Board……………………..………..............30
6.4. IR Board………………………………..……….......30
7. White-Balance, LuminanceAdjustment...................31
8. Block Diagram.……...........................................33
9. Schematic……………...…………..………………...34
9.1 Main Board…….…………..……………….….......34
9.2.Power Board…………….……….………….......46
9.3.Tuner Board……………………..………..............48
9.4.Key Board……………………..………..............52
10. Exploded View..……………............................…..53
11. BOM List……………….………………………….….54
12.Different Parts List…………………………………..73

22’’ LCD TV AOC L22W631
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Revision List
Version
Release Date
Revision Instructions
TPV Model
A00
Sep.-06-2007
Initial Release
E227ANNS2WAENN
A01
Nov.-06-2007
Add new model
E227ANNK2WA5NN
A02
Dec.-11-2007
Lead in CKD model for Brazil
E227ANNS2WAE3N

22’’ LCD TV AOC L22W631
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Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service
procedures recommended by AOC and describedin this service manual are effective methods of performing service
operations. Some of these service operations require the use of tools specially designed for the purpose. The
special tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in
order to minimize the risk of personal injury to service personnel. The possibility exists that improper service
methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE
NOT EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in
which service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not
undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not
recommended by AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the
equipment will be jeopardized by the service method selected.
Hereafter throughout this manual, AOC Company will be referred to asAOC.
WARNING
Use of substitute replacement parts, which do not have the same, specified safety characteristics might create
shock, fire, or other hazards.
Under no circumstances should the original design be modified or altered without written permission from AOC.
AOC assumes no liability, express or implied, arising out of any unauthorized modification of design.
Servicer assumes all liability.
FOR PRODUCTS CONTAINING LASER:
DANGER-Invisible laser radiations when open AVOID DIRECT EXPOSURE TO BEAM.
CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may
result in hazardous radiation exposure.
CAUTION -The use of optical instruments with this product will increase eye hazard.
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S
REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF
THIS SERVICE MANUAL.
Take care during handling the LCD module with backlight unit
-Must mount the module using mounting holes arranged in four corners.
-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.
-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to
the panel.
-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).
-Make certain that treatment person’s body is grounded through wristband.
-Do not leave the module in high temperature and in areas of high humidity for a long time.
-Avoid contact with water as it may a short circuit within the module.
-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may
damage the panel.)

22’’ LCD TV AOC L22W631
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1. General Specification
Items
Specification
LCD Panel
Panel Type
M220EW01 V0A panel
Driving system
TFT-LCD AUO Panel
Aspect Ratio
16:10
Resolutions
1680 x1050
Pixel Pitch
0.282mm x0.282mm
Display colors
16.7 million
Color Temperature
Cool / Warm/normal
TV Function
TV Standard
NTSC-M , PAL-M, PAL-N
Sound System
STEREO
Closed Caption / V-chip For USA
Video Inputs
AV
RCA x 1
Audio L/R x 1
S-Video
S-Video x 1
Audio L/R x 1
COMPONENT
Y,Cb,Cr x 1
Audio channel L / Rx 1
Audio Output
Audio Output: L / R
Speaker (built-in): Two 5W speakers
Headphone Mini-jack for stereo (3.5ø)
OSD language
English, etc
Wall Mount
VESA 100 mm x 100 mm
Power
Power Supply
AC100V~240V, 50/60Hz
Power Consumption
≤75W
Standby
<1W
Environment
Operating
+ 0 °C ~ + 40 °C
Storage
- 25 °C ~ + 60 °C
Operating
10% ~ 85%
Dimension
W x H x D (with stand)
539 x 447x 216 (mm)
Net weight
Without accessory
6.7 Kg
Accessory
Remote controller, Battery, Power cord, Signal Cable,
Audio Cable, User manual

22’’ LCD TV AOC L22W631
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2. Operating Instructions
2.1 The Use of Remote Control
POWER
Press to turn on/off the TV. The
TV is never completely
powered off unless it is
physically unplugged.
0~9/100 Digit buttons
To select a TV channel. You
can directly input number key
in sequence to select any
channel.
CH
Press or to browse
through the TV channels,
which are not Skip. To view a
blocked channel, use the digital
buttons to access，the channel
and enter your access code.
VOL
Press or to adjust the
volume.
PC
Press for PC mode
SLEEP
With this key you can set a
time period after which the
TV should switch itself to
standby. Press the key
repeatedly to select the
number of minutes. The
counter runs from
5,10,15,30,45,60,90,120 ,
180,240 minutes or off.
PIP
Not Supported.
POP
Not Supported.
MUTE
Temporarily interrupt the
sound or restore it.
DISPLAY
Press this button to display
source information on the
left-top corner. TV mode, will
show Channel number
MTS /SAP
Press to activate
Multichannel Television
Sound, Stereo or Mono
sound.
PRE-CH
Press to display the
previously selected TV
channel.
TV/VIDEO
Select your input source:
press repeatedly to select TV,
AV, S-VIDEO, Component
or PC,HDMI.
CAPTION
Press to select Closed
Caption channel or turn it off
Up & Down
Press these keys to move
up, down in the on-screen
menus. When the
on-screen menu is closed,
press it to change program
number
Left & Right
Press Left and Right, we can
Change the Setting of
submenu. When the
on-screen menu is closed,
press it to adjust volume.
SWAP
Not supported
V-CHIP
Turn on or off Child lock
function.
Size
Switch between Normal,
Wide1, wide2, zoom or
Cinema.

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MAIN MENU
2.2 To Use the Menus
1. Press the MENU button to display or close main menu.
2. Use the up/down to select a menu item.
3. Use the cursor left/right to enter a submenu or enable/disable the function.
4. Press the MENU button to exit the menu.
Press the MENU button to enter the main OSD (On Screen Display). Adjust the items including Audio setup, Video
setup, V-Chip setup, Function setup and TV setup. When the input source is VGA ,HDMI ,AV, S-VIDEO or
Component mode, only theAudio setup, Video setup and Function setup can be selected;
When the input source is TV mode, the Audio Setup, Video Setup, V-chip Setup, Function Setup and TV Setup can
be selected.
Audio Setup (Same as in VGA, TV, AV, S-Video, HDMI and Components mode)
1. The range of Volume, Bass and Treble is 0~100.
2. The range of Balance is -50~+50. Adjusted from 0 to -50, the sound from the right track fades until silent.
Adjusted from 0 to +50, the sound from the left track fades until silent.
3. Preset: Select audio preset mode according to your preference. You can select Personal, Voice, Music and
Theatre mode.
4. Equalizer: You can select and adjust 100, 300, 1K, 3K and 8K respectively (the figures represent the sound
frequency range).

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5. Reset to default: Reset the audio setting to the factory default value.
Video setup
When the input source is in VGA mode, you can select Brightness, Contrast, Position, Video noise, Sharpness,
Auto adjust, Information, Color Temp. and Reset to default .
1. Brightness and Contrast: The range can be adjusted from 0~100.
2. Position: There are two options, Horizontal and Vertical, could adjust from -50 to +50 to adjust picture position on
screen.
3. Video noise: There are two options, Phase and Clock, could adjust from -50 to +50.
4. Sharpness: Select from five options of Normal, Softest, Soft, Sharp and Sharpest.
5. Auto adjust: Automatically adjust PC input to the optimal screen size.
6. Information: Prompt the current size for PC input definition
7. Color Temp.: There are five options of color temperature provided for users –SRGB, Normal, Cool, Warm and
User. You can select the four-color temperatures of SRGB, Normal, Cool and warm or manually adjust red, green
or blue in the user setting (you can only adjust red, green and blue in the user color).
8. Reset to default: Reset the video setting to the factory default value.
When the input source is in HDMI mode, you can select Brightness, Contrast, Sharpness, Information, Color
Temp, and Reset to default.

22’’ LCD TV AOC L22W631
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Information: It shows the solution of signal input.
Others are same to VGAmode.
When the input source is in TV/AV/S-Video/Component mode, you can select Brightness, Contrast, Color,
Sharpness, Tint, Dyn. skin tone, Color Temp, Preset, Size and Reset to default.
1. Brightness and Contrast: The range can be adjusted from 0~100.
2. Color: Could adjust from 0 to 100 to adjust the color saturation of picture.
3. Sharpness: Select from five options of Normal, Softest, Soft, Sharp and Sharpest.
4. Tint: Could adjust from 0 to 100 to adjust the color of picture.
5. Dyn. Skin tone: When the Dynamic skin tone is ON, the skin tone of person in the picture will be more vivid.
6. Color Temp.: There are three options of color temperature provided for users –Normal, Cool and Warm.
7. Preset: Select video preset mode according to your preference. You can select Personal, Movie, Sport Weak
signal and Game.
8. Size: There are five options –Normal, Wide 1, Wide 2, Zoom and Cinema.
9. Reset to default: Reset the video setting to the factory default value.
Function Setup
When the input source is in all mode, you can select Set time, Language , Sleep time and Reset to default ,But CC
and CC Preset just only for AV/S-Video/TV mode

22’’ LCD TV AOC L22W631
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1. Set time: You can set clock with up/down key. Afterpulling out power cord, clock will be called back to 12:00 AM.
You should set again when you plug power cord.
2. Language: Three languages provided - English, Portuguese and Spanish.
3. Sleep timer: Set the sleeping timer and the alert function, which will indicate the time left. You can set as
5,10,15,30,45,60,90,120,180,240 Min or off
4. CC: Set Close caption function on or off
5. CC Preset: Set Close caption channel. You can select CC1~CC4,TT1~TT4.
6. Reset to default: Reset the function setting to the factory default value.
TV Setup
The following menu appears only in the TV mode.
1. Program no.: Shows the current channel number. You can change program no with left/right key of remote
control.
2. Tuning mode: Select the mode of TV signal –Cable
3. TV System: There are four options as NTSC-M, Auto, PAL-M and PAL-N. Recommend set it to auto.
4. Auto search: Select "Auto Search" to search all signaled channel; when the search is complete, it stays at the
first channel with signal and all channels that have been located are stored. If you would like to stop "Auto
Search" during the process, press the Menu button.
5. Fine Tuning: Fine Tune frequency of current program.
6. AFC: AFC can be set to ON or OFF. When it is set to ON, the TV will search the TV signal automatically. When
there is any offset in the signal, it will automatically adjust the channel to the correct position.
7. Skip: can be set to ON or OFF. When it is set to ON, the channel without signal can be skipped by pressing the
up/down button on the remote control or on the front panel.
8. Reset to default: Reset the TV setting to the factory default value.

22’’ LCD TV AOC L22W631
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2.3 How to Connect
Remove the back plate at the back of the TV as shown on the illustration opposite. Lay the LCD TV with the screen
down on a table, as it will be easier to connect your peripheral equipment. Please take precaution not to damage the
screen.
1. AC power input terminal
2. VGA audio input
3. VGA signal input
4. AV signal input
5. Right audio track input (AV/S-Video)
6. Component left audio track input
7. Component right audio track input
8. TV input
9. Headphone outlet
10~12. Component signal input(Y, Pb, Pr)
13. Left audio track input (AV/S-Video)
14. S-Video signal input
15. HDMI input
Video recorder
How to connect
1. Connect the supplied antenna cable to the RF IN port of your VCR.
2. Connect another FR cable from the port of your VCR to the antenna port of you TV set. If you have connected the
video/audio cable to thevideo AV port, you may have better sound and picture when playing the VCR .
If your VCR has an S-VHS video jack:
For improved picture quality, connect a S-Video cable with the S-VIDEO input on the TV.
S-Video does not provide audio, audio cables must still be connected to provide sound (AV and S terminal share
one audio input).
Watching VCR
1. If you use connection TV, select the TV channel auto search.
2. If you use connection AV, select video AV input.
3. Insert videotape in the VCR and press the PLAY button.

22’’ LCD TV AOC L22W631
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DVD Player
How to connect
1. Connect 3 separate components signal cables to the Y, Pb and Pr ports of the component signal of the DVD
player, and the Y, Pb and Pr ports of the component signal of theTV set.
2. Connect the audio cable to the audio output port of the DVD player and the audio input port of the component
signal of the TV set.
How to use
1. Select Component mode.
2. Turn on the DVD set.
Camera camcorder video game set….
How to connect
1. Connect the camera, camcorder and game set to the ports of the audio/video set.
2. The camcorder may get better picture by connecting a S-Video cable between the equipment and the TV set.
How to use it
1. Select the videoAV or S-Video input.
2. Enable the exterior AV equipment.
Digital set top box
Connect the top box to the input port of the component signal.
How to connect
1. Connect 3 separate component signal cables to the Y,Pb and Pr ports of the component signal of the Digital TV/
Top Box, and the Y, Pb and Pr ports of the component signal of theTV set.
2. Connect the audio cable with the audio port of the Digital TV/Top Box and the audio port of the TV set.
How to use
1. Select Component.
2. Turn on the DVD set-Top box set.
Headphone
1. The headphone jack is located at the rear corner of the TV.
2. The MUTE key on the remote control works on both internal speaker and the headphone.
3. Use volume key to adjust the volume.

22’’ LCD TV AOC L22W631
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2.4 Front Panel Control Knobs
VOL : Press to confirm your function selection (when the OSD main menu displayed) or adjust volume (without
OSD main menu)
CH : Select the intended function by pressing the two keys (when the OSD main menu displayed), or switch
the channels in the TV mode (without OSD main menu)
MENU : Press to show the OSD menu and exit OSD menu at the TV mode
INPUT: Press to select your input source.
POWER:Press to turn on or off the TV.

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3. Input/Output Specification
3.1 RGB Signal input
15 - Pin Color Display Signal Cable
Pin No.
Description
Pin No.
Description
1
Red Video
9
No Pin!
2
Green Video
10
Sync Ground
3
Blue Video
11
SDA(Remote Control)
4
SCL(Remote Control)
12
Serial Data for DDC
5
Ground
13
H-Sync.
6
Red Video Ground
14
V-Sync.
7
Green Video Ground
15
Serial Clock for DDC
8
Blue Video Ground
3.2RF HDTV Signal input
TUNER SIGNAL
Channel Coverage
NTSC ，PAL M/N
Tuner
ChangHong
TAF5-U2F41RW
VHF Low band
IC1(55.25MHz) ～S6(127.25MHz)CH
VHF High band
S7(133.25MHz) ～S36(361.25MHz)CH
UHF band
S37(367.25MHz)～C57(801.25MHz)CH
IF Frequency
Picture carrier
Sound carrier
42.17 MHz
41.25 MHz
Stereo/Bilingual
BTSC / SAP
Impedance
: 75 ohm terminated
LEVEL
: 70dBuV

22’’ LCD TV AOC L22W631
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3.3 AV/S-Video/Component Video Inputs
AV
(Composite Video)
Video system
PAL / NTSC-M
Amplitude
1.0Vpp (including sync)
Impedance
75 ohm terminated
S-Video
Video system
PAL/ NTSC-M
Y signal amplitude
1.0Vpp (including sync)
C signal amplitude
0.286Vpp
Impedance
75 ohm terminated
Component Video
Video System
DTV
480i, 480p, 576i,576p,720p, 1080i
Y signal amplitude
1.0Vpp (including sync)
Pr/ Pb signal amplitude
0.7Vpp
Impedance
75 ohm terminated
3.4 HDMI Inputs
HDMI
( EIA/CEA-861B )
Output Formats
H/V Frequency
HZ
Resolution
Component
1.
480 I (SDTV)
15.734K / 60
720 - 240
2.
480 P(SDTV)
31.469K / 60
720 - 480
3.
576 I(SDTV)
15.625K / 50
720 - 288
4.
576 P(SDTV)
31.250K / 50
720 - 576
5.
1080I /60 (HDTV)
33.750K / 60
1920 - 1080
6.
1080I /50 (HDTV)
28.125K / 50
1920 - 1080
7.
720P /60 (HDTV)
45.00 K / 60
1280 - 720
8.
720P /50 (HDTV)
37.50 K / 50
1280 - 720

22’’ LCD TV AOC L22W631
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3.5 Compatible Mode Table
Item
Video Mode
fH
(kHz)
fV
(Hz)
Dot
clock
(MHz
)
Sync
polarity
Horizontal (dot)
Vertical (line)
Ana
log
H
V
H-tot
al
H-wi
de
H
Back
porch
H
Front
porch
V-to
tal
V-wid
e
H
Back
porch
H
Front
porch
1
VESA
VGA 640x480
31.46
9
59.94
0
25.17
5
N
N
800
96
48
16
526
2
33
11
Y
2
37.86
1
72.80
9
31.50
0
N
N
832
40
128
24
520
3
28
9
Y
3
37.50
0
75.00
0
31.50
0
N
N
840
64
120
16
500
3
16
1
Y
4
SVGA 800x600
35.15
6
56.25
0
36.00
0
P
P
1024
72
128
24
625
2
22
1
Y
5
37.87
9
60.31
7
40.00
0
P
P
1056
128
88
40
628
4
23
1
Y
6
48.07
7
72.18
8
50.00
0
P
P
1040
120
64
56
666
6
23
37
Y
7
46.87
5
75.00
0
49.50
0
P
P
1056
80
160
16
625
3
21
1
Y
8
XGA 1024x768
48.36
3
60.00
4
65.00
0
N
N
1344
136
160
24
806
6
29
3
Y
9
56.47
6
70.06
9
75.00
0
N
N
1328
136
144
24
806
6
29
3
Y
10
60.02
3
75.02
9
78.75
0
P
P
1312
96
176
16
800
3
28
1
Y
11
SXG
A
1152x864
67.50
0
75.00
0
108.0
00
P
P
1600
128
256
64
900
3
32
1
Y
12
1280x102
4
63.98
1
60.02
0
108.0
00
P
P
1688
112
248
48
106
6
3
38
1
Y
13
79.97
6
75.02
5
135.0
00
P
P
1688
144
248
16
106
6
3
38
1
Y
14
VGA
TEXT
720x400
31.46
9
70.08
7
28.32
2
N
P
900
108
45
27
449
2
35
12
Y
15
Macin
tosh
640x480
35.00
0
66.66
7
30.24
0
N
N
864
64
96
64
525
3
39
3
Y
16
832x624
49.72
5
74.50
0
57.28
3
N
N
1152
64
224
32
667
3
39
1
Y
17
1024x768
60.15
0
74.72
0
80.00
0
N
N
1330
96
168
42
805
3
31
3
Y
18
1280x768
47.77
6
59.87
0
79.50
0
N
P
1664
128
192
64
798
7
20
3
Y
19
1280x960
60.00
0
60.00
0
108.0
00
P
P
1800
112
312
96
100
0
3
36
1
Y
20
1440x900
55.93
5
59.88
7
106.5
N
P
1904
152
232
80
934
6
25
3
Y

22’’ LCD TV AOC L22W631
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4. Mechanical Instructions
1. Remove the 4 screws to remove the base.
2. Remove the 5 screws to remove the rear cover.
3. Remove the AC cover.

22’’ LCD TV AOC L22W631
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4. Remove the shield.
5. Remove the main board, power board.

22’’ LCD TV AOC L22W631
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6. Remove the key board & IR board & speaker.
7. Relax the clips to remove the bezel.

22’’ LCD TV AOC L22W631
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5. Repair Flow Chart
1. No Power (No LED indicator)
Check CN902 Pin 1/2 = 12V
Check AC line volt 110V or 220V
Check AC input
Check the voltage of C905 (+)
Check bridge rectified circuit and F901 circuit
Check start voltage for the pin 8 of IC901
Check R904, R932, R933 or Change IC901
Check the auxiliary voltage is bigger than
10V and smaller than 20V
1) Check IC901, T901
2) Check C908, D902 circuit
OK
OK
NG
Check
D904/D906/Q903/ZD920/IC903/IC902
Check IC901 pin 6 PWM wave
OK
Check IC901, Q901
NG
NG
NG
OK
NG
NG
OK

22’’ LCD TV AOC L22W631
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2. Can not start (LED indicator green)
Check CN801~CN804 connected ok?
Please connect them ok.
Check PT801/PT802 output circuit.
Check CN902 PIN3/4=5V&PIN1/2=12V?
Return “1”
NG
OK
Check IC801 PIN5=5V?
OK
Check IC801 pin11/pin12/pin19/pin20
output is PWM?
Check PT801/PT802 output voltage is
OK?
Check and Debug IC801 fail or the circuit
around IC801
NG
NG
Check and Debug IC801 output circuit.
OK
Check and Debug Q804/Q802/Q803 circuit
NG
NG
OK
OK