AOC L20W431 User manual

20’’ LCD TV Color Monitor AOCL20W431
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Service
Service
Service
Horizontal Frequency
31.5-49kHz
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
7.1.Main Board…………..………….……….......29
7.2.Power Board……………..………….……….......31
7.3.Tuner Board…………………………….……….......33
7.4.IR Board………………………………………….......36
7.5.Earphone Board………………………..……….......37
7.6.Key Board……………………………….……….......37
8. Block Diagram.……...........................................38
9. Schematic……………...…….……..………………...39
9.1 Main Board…….…………..….…………….….......39
9.2.Power Board…………….……….………….......52
9.3 Tuner Board…………………….…………….......53
10. Exploded View..……………..........................…..57
11. BOM List……………….…………………………….58
12. Different Parts List………….……………………….77
Table Of Contents.......……..............................…........1
Important Safety Notice.......................................……......2
Revision List.…........................................……......3
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…….…………………….……….....12
2.4. Front Panel Control Knobs……………….……….....14
3. Precautions and Notices ……..……………..............15
4. Input/Output Specification…………....................…....16
5. Mechanical Instructions…………………….................18
6. Repair Flow Chart ……………………….…….…….....23
7. PCB Layout ………………..………………....….......29

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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 described in 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 as AOC.
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.)

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Revision List
Version Release Date Revision Instructions TPV Model
A00 Sep.-18-2006 Initial Release E206MHNSD1A2NP
E206MHNKD1A5NP

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1. General Specifications
Items Specification
Panel Type 20” CMO C2panel
Driving system TFT-LCD CMO Panel
Aspect Ratio 16: 9
Resolutions 1366 x768 (WXGA)
Active Area 444.633 (H) x 249.984 (V)
Pixel Pitch 108.5um x325.5um
Display colors 16.2 million
Lamp Type/Life 50000 hr (type)
LCD Panel
Color Temperature Cool / Warm/normal
Input support definition
Could support to 1366*768
This product could only support to 60Hz, ‘Input out
of range’ will displayed when the input vertical
frequency out of 60Hz
VGA Function
Audio input Mini jack for stereo headphones (3.5ø)
TV Standard NTSC/M, PAL/M,PAL/N
Sound System MTS、SAP
TV Function
Color systems PAL / NTSC
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
Video Inputs
YPbPr support timing 480i、576i、480p、576p、720p、1080i (include
YCbCr input) Audio L/R x 1
Speaker (built-in): Two 3W speakers
Audio Output Audio Output: L / R Headphone Mini-jack for stereo (3.5ø)
OSD language English. French. German. Spanish. Portuguese. Traditional Chinese
Wall Mount VESA 100 x 100 mm
Power Supply AC100V~240V, 50/60Hz
Power Power Consumption ≤90W
Operating + 0 °C ~ + 40 °C
Storage - 25 °C ~ + 60 °C
Environment
Operating 10% ~ 85%
W x H x D 546 x 448 x 256 (mm)
Dimension Net Weight (Kg) 7.5 Kg
Accessories Remote controller, Batteriesx2, Power cord, Signal Cable, Audio Cable, User manual

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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
0,30,60,90,120 minutes. The
timer begins to count down
from the number of minutes
selected after the display has
disappeared.
2. Operating Instructions
2.1. The Use of Remote Control
MENU
Press repeatedly to display OSD menu.
V-CHIP
Press this button to setup parental
control.
SWAP
Not Supported. (for the model with this
function only).
SIZE
Includes 3 modes. Press repeatedly to
select 4:3/ 16:9 (linear) /16:9
(non-linear).
POP
Not Supported. (for the model with this
function only).
CAPTION
Press this button to turn
Closed Caption on.
Be sure you have selected
Caption On in the Setup menu.
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.
TV/VIDEO
Select your input source: press
repeatedly to select TV, AV1,
AV2, S-VIDEO or COMPONENT
mode, according to where you
connected your external source.
AV1/AV2 for a VCR connected to
the AV connectors of the TV.
S-VIDEO for a S-Video VCR
connected to the S-VIDEO
connector of the TV.
COMPONENT for a DVD/DTV
Set Top Box or another
component video device
connected to Y, Pb, Pr and to the
AV AUDIO inputs L and R.
MTS /SAP
Press this key to activate
Multichannel Television Sound,
Stereo or Mono.
VOL
Press + or – (or or ) to
adjust the volume.
PC
select
y
our in
p
ut source to PC
MUTE
Temporarily interrupt the sound
or restore it.
CH
Press or (or ▲or▼) to
browse through the TV
channels which are not erased.
To view a blocked channel, use
the digit buttons to access the
channel and enter your access
code.
PRE-CH
To display the previously
selected TV channel.
PIP
Press this button to display
PC input and other input on
the screen at same time.
DISPLAY
Press this button to Display
Channel number on the
right-top corner.

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MAIN MEN
U
2.2 To Use the Menus
1. Press the MENU button repeatedly to display each menu.
2. Use the cursor up/down to select a menu item or adjust the setting of Menu item.
3. Use the cursor left/right to enter a submenu or enable 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 Picture Setup,
Sound setup, Child Lock Setup, Function Setup and TV setup. When the input source is PC or Component mode,
only the Sound Setup, Picture Setup and Menu Setup can be selected; shown in the figure below:
When the input source is AV or S-Video mode, the Sound Setup, Picture Setup, Child Lock Setup and Function
Setup can be selected; shown in the figure below:
When the input source is TV mode, the Sound Setup, Picture Setup, Child Lock Setup, Function Setup and TV
Setup can be selected; shown in the figure below:
Sound Setup (Same as in PC, TV, AV, S-Video and Component modes)
1. The range of adjusting volume, bass and treble is from 0~100.
2. Select “ON” or “OFF” in sound selection to control the sound output.
3. The range of adjusting Balance is -50~+50; when adjusting from 0 to -50, the sound from the right track fades
until silence; when adjusting from 0 to +50, the sound from the left track fades until silence.
4. AVL: you can set it “ON” or “OFF”.
The function is to adjust the input sound automatically. You may enable this function when you notice that the
sound in the two tracks are very different, in order to prevent the bad sound effect resulting from large sound
variation.
5. Select "ON" or "OFF" for Loudness: a default setting is preset, you may adjust when necessary.
The following menu will appear when selecting continuously:

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6. Preset: Designed for different types of sound output, wherein, the dialogue, music and theater modes are preset;
you can set Bass, Treble and Equalizer in sound output mode according to your preference.
7. Equalizer: You can select and adjust 100, 300, 1K, 3K and 8K respectively (the figures represent the sound
frequency range).
8. Reset to default: Reset the sound setting to the factory default value.
Picture Setting
When the input source is in PC mode, you can select Brightness, Contrast, Position, Video noise, Sharpness, Auto
Adjust, Info, Colour Temp., Red, Green, Blue and Reset to default; shown in the figure below:
1. Brightness and Contrast: The range can be adjusted from 0~100.
2. Position: There are two options, Horizontal and Vertical, which can be adjusted from -50 to +50.
3. Video noise: There are two options, Phase and Clock, which can be adjusted from -50 to +50.
4. Sharpness: Select from five options of Softest, Soft, Auto, Sharp and Sharpest. You may adjust the above
options according to your preference.
5. Auto Adjust: Automatically adjust PC input to the optimal screen size.
6. Info: Prompt the current size for PC input definition (only the definition that can be shown by this device).
7. Colour Temp.: There are four options of colour temperature provided for users - 6500, 7300, 9300 and Personal.
You can select the three colour temperatures of 6500, 7300 and 9300, or manually adjust red, green or blue in
the personal setting (you can only adjust red, green and blue in the personal setting).
8. Reset to default: It is used to reset the picture settings to the factory default mode.

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When the input source is in TV/AV/S-Video/ mode, you can select Brightness, Contrast, Colour, Sharpness, Tint,
Dyn. skin tone, White tone, Size and Reset to default respectively; shown in the figure below:
When the input source is in Component mode, you can select Brightness, Contrast, Colour, Sharpness, Tint,
White tone, Size and Reset to default respectively; shown in the figure below:
1. Brightness and Contrast: The range can be adjusted from 0~100; use Brightness and Contrast options to adjust
the brightness of picture.
2. Colour: The range can be adjusted from 0~100; use this option to adjust the colour saturation of picture.
3. Sharpness: Select from five options of Softest, Soft, Auto, Sharp and Sharpest. You can adjust the sharpness of
picture using any option above.
4. Tint: The range can be adjusted from -50~+50; use this option to adjust the colour of picture.
5. Dyn. Skin tone: When the Dynamic skin tone is ON, the skin tone of person in the picture becomes more vivid.
6. Colour Temp.: There are three options of colour temperature provided for users - warm, normal and cold.
7. Size: There are various functions provided for zoom in/zoom out.
8. Reset: It is used to reset the picture settings to the factory default mode.
Function Setup
When the input source is in TV, AV or S-Video mode, you can select Source OSD, Language, Child lock, Sleep
timer, CC Mode and Reset to default; shown in the figure below:

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1. Current Source OSD setting: When OSD is set to ON, the left upper corner of the display will show the input
source or the TV channel number; when OSD is set to OFF, the input source or the TV channel number will
disappear.
2. OSD language setting: There are six language options provided - English, French, German, Spanish,
Portuguese and Traditional Chinese.
3. Child Lock Setup;
(1). You can enter the V-Chip level setting only when the Child Lock is ON, and the V-Chip will be enabled; you
can not enter V-Chip level setting when the Child Lock Setup is OFF, and the V-Chip is disabled.
(2). Lock code: V-Chip password can be set up when the code is locked. Enter the 4-digit password which you
choose! The factory default password is 0000.
4. Sleep Timer: Set the sleeping timer and the alert function which indicates the time left.
5. Closed Caption (CC) setting: Select CC1~CC4, TXT1~TXT4 or OFF.
6. Reset: It is used to reset the OSD settings.
When the input source is in PC or Component mode, you can select Source OSD, Language, Sleep timer and Reset
to default; shown in the figure below:
Source OSD, Language, Timers and Reset to default options are operated similarly as the above instructions!
Child Lock
When the input source is in TV, AV or S-Video mode, V-Chip level can be set. You can enter the Child Lock setting

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only when the Child Lock is ON. When you enter the Child Lock setting, a message on the display will prompt you to
enter password:
You can enter the Child Lock setting to set up the V-Chip level when you enter the correct password:
1. Age: it may be set to Child, Teenager, Youth, Adult, Custom or OFF; when you select Custom, it can be set
according to you preference.
2. MPAA Rating: Select the movie ratings from low to high (alert) - G, PG, PG-13, R, NC-17, X and F.
3. PG Rating: Shown in the figure below:
The empty box refers to unlocked; the solid box refers to locked.
4. Reset to default: Reset to the factory default value.
TV Setting
The following menu appears only in the TV mode.
1. Channel nr: Shows the current channel number.
2. Tuning mode: Select the mode of TV signal - Cable\HRC Cable\IRC Cable\ Broadcast.
3. System standard: NTSC-M, PAL-M,PAL-N and Auto.
4. Auto search: Select "Auto Search" to search all signaled channel; when the searching 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, simply by pressing the function button.
5. Fine tune: Fine tune the frequency of current channel.

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6. 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, a channel can be skipped by pressing the switching button
on the remote control or on the front panel.
8. Reset to default: Reset to the factory default value.

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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: VGA audio input
2: VGA input
3: AC power input terminal
4: Headphone outlet
5: AV signal input
6: Left video/audio track input
7: Right video/audio track input
8: S-Video signal input
9, 10 and 11: Pr Pb Y Component signal input
12: Y Pb Pr left audio track input
13: Y Pb Pr right audio track input
14: TV signal input
VGA: Receive the signals from the host, which is used as the display of the computer.
AV: Receive the video/audio signals of the NTSC, PAL-M/N.
S-VIDEO(S-VHS): i.e. video Y/C component. Receive the HD Y/C component signal.
Y Pb Pr: The modes it supports are HD signals such as 480i, 480p, 720p and 1080i.
TV: Receive the TV signals of NTSC-M, PAL-M/N.
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 the video 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

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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.
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.
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-VHS cable between the S terminal and the Audio set.
How to use it
1. Select the video AV or S terminal input.
2. Enable the exterior AV equipment.
Warning: In case you notice scrolling images, wrong colors or no color, no picture or even combinations of these, on
your screen, check if the connections are done in the right way. Check if the cable colors match with the Input
connector colors.
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.
Warning: In case you notice scrolling images, wrong colors or no color, no picture or even combinations of these,
on your screen, check if the connections are done in the right way. Check if the cable colors match with the Input
connector colors.
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.
2.4 Front Panel Control Knobs

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Power Key ⑦:Press to turn on or off the TV.
MENU Key ⑥: Press to show the OSD menu and exit OSD menu at the TV.
Down / Up Key ⑤④:Select the intended function by pressing these two keys, or switch the channels in the TV
mode.
+ /- Key ②③: Press to confirm your function selection and adjustment volume.
Source Key ①: Press to select your input source.

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3. Precautions and Notices
3.1 Assembly Precaution
(1) Please do not press or scratch LCD panel surface with anything hard. And do not soil LCD panel surface
by touching with bare hands (Polarize film, surface of LCD panel is easy to be flawed)
In the LCD panel, the gap between two glass plates is kept perfectly even to maintain display
characteristic and reliability. If this panel is subject to hard pressing, the following occurs:
(a) Uniform color (b) Orientation of liquid crystal becomes disorder
(2) Please wipe out LCD panel surface with absorbent cotton or soft cloth in case of it being soiled.
(3) Please wipe out drops of adhesive like saliva and water in LCD panel surface immediately.
They might damage to cause panel surface variation and color change.
(4) Do not apply any strong mechanical shock to the LCD panel.
3.2 Operating Precaution
(1) Please be sure to unplug the power cord before remove the back-cover. (Be sure the power button is
turn-off)
(2) Please do not change variable resistance settings in MAIN-BOARD; they are adjusted to the most
suitable value. If they are changed, it might happen LUMINANCE does not satisfy the white balance
spec.
(3) Please consider that LCD backlight takes longer time to become stable of radiation characteristic in low
temperature than in room temperature.
(4) Please pay attention to displaying the same pattern for very long-time. Image might stick on LCD.
3.3 Storage Precaution
(1) When you store LCD for a long time, it is recommended to keep the temperature between -10°C -50°C
without the exposure of sunlight and to keep the humidity less than 85% RH.
(2) Please do not leave the LCD in the environment of high humidity and high temperature such as 50°C,
85%RH.
(3) Please do not leave the LCD in the environment of low temperature: below -10°C.
3.4 High Voltage Warning
The high voltage was only generated by INVERTER module on Power Board, if carelessly contacted the
transformer on this module, can cause a serious shock. (The lamp voltage after stable around 600V, with
lamp current around 8mA, and the lamp starting voltage was around 1500V, at Ta=25°C)

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4. Input/Output Specification
4.1 RF Tuner
TUNER SIGNAL
Channel Coverage NTSC and PAL M/N
Tuner Philips 1316E-MK4
AIR CATV
VHF Low band 55.25~127.25 55.25~127.25
VHF High band 133.25~361.25 133.25~361.25
UHF band 367.25~801.25 367.25~801.25
IF Frequency
Picture carrier Sound carrier
45.75 MHz 41.25MHz
Impedance 75 ohm terminated
LEVEL 70dBuV
4.2 AV/S-Video/Component Video Inputs
Video system NTSC and PAL M/N
Amplitude 1.0Vpp (including sync)
AV
(Composite Video)
Impedance 75 ohm terminated
Video system NTSC and PAL M/N
Y signal amplitude 1.0Vpp (including sync)
C signal amplitude 0.286Vpp
S-Video
Impedance 75 ohm terminated
DTV 480i, 480p, 720p, 1080i
Y signal amplitude 1.0Vpp (including sync)
Pr,(R-Y) / Pb,(B-Y) signal amplitude 0.7Vpp
Component Video (D4)
Impedance 75 ohm terminated
4.3 Compatible Mode Table
MODE ASPECT RATIO HANDLING COMPATIBLE INPUTS
STANDA
RD RESOLUTION FS*
Full-Scre
en
AR
Aspect
Ratio 1:1 Com
p SVH S YPBP R YCBC R RG B
640x480 @
60Hz
1366 x
768
1024 x
768 N/A No No No No Yes
VESA 800x600 @
60Hz
1366 x
768
1024 x
768 N/A No No No No Yes
VESA 1024x768 @
60Hz
1366 x
768
1024 x
768 N/A No No No No Yes
1280x720 @
60Hz
1366 x
768
1024 x
768 N/A No No No No Yes
1280x768 @
60Hz
1366 x
768
1024 x
768 N/A No No No No Yes
1360x768 @
60Hz
1366 x
768
1024 x
768 N/A No No No No Yes
NTSC 480i
1366 x
768
1024 x
768* N/A Yes Yes Yes
Yes No
PAL 576i
1366 x
768
1024 x
768* N/A Yes Yes Yes Yes No

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DVD 480p
1366 x
768
1024 x
768* N/A No No Yes No No
576P
1366 x
768
1024 x
768* N/A No No Yes No No
720p
1366 x
768
1024 x
768* N/A No No Yes No No
1080i
1366 x
768
1024 x
768* N/A No No Yes Yes No
4.4 RGB Signal
15 - Pin Color Display Signal Cable
Pin No. Description Pin No. Description
1 Red Video 9 Mandatory +5V Supply for PC Bypass
2 Green Video 10 Sync Ground
3 Blue Video 11 Ground
4 Ground 12 Bi-directional Data (SDA) for PC Bypass
5 Ground 13 H-Sync.
6 Red Video Ground 14 V-Sync.
7 Green Video Ground 15 Data Clock (SCL) for PC Bypass
8 Blue Video Ground
1
6
11 15
5
10

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5. Mechanical Instructions
1. Remove the screws to remove the base.
2. Remove the seven screws to remove the back cover.

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3.Removetheelevenscrewstoremovetheshield.
4. Remove the twelve screws to remove the main board, power board and I/O board.
5. Remove the two screws to remove the headphone board.

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6. Remove the 15 screws to remove the bezel.