AOC L32W581B User manual

32” LCD TV AOC L32W581B
1
Service
Service
Service
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 VOLTAGE
Table Of Contents.......……..............................…........1
Revision List.…........................................……......2
Important Safety Notice.……..................……......3
1.General Specifications..............................………........4
2.Operating Instructions………..…………………….......5
2.1.The Use of Remote Control…................……...........5
2.2.To Use the Menu………..............................…...........7
2.3.LCD TV Description…….…..............……...............14
2.4.Interface Connector……............................…...........14
3.White Balance Luminance Adjustment….…........15
4.Input/Output Description……..…………… ...........20
4.1.D-SUB Connector……...…………………....….......20
4.2.Factory Preset Display Modes……………..….......21
5.Front Panel Control Knobs…....................................21
6.Repair Flow Chart…….............................................22
7.Mechanical Instructions……………................29
8.PCB Layout..………….......................................34
8.1.Main Board……….....…….................................34
8.2.Power Board…...………...................................37
8.3.Tuner Board…...……….........................................40
8.4.IO Board…………............................................41
8.5.IR Board……………….......................................42
8.6.Key Board………………......................................43
9.Block Diagram………………..............................44
10.Schematic Diagram………………...............…45
10.1.Main Board..............................................45
10.2.Power Board....…….......................................66
10.3.Tuner Board....……..……....................................67
10.4.IO Board....……..............................................68
10.5.Key Board....……..............................................71
11.Exploded View………..….......................................72
12.BOM List…….……………………………….............74
13.Different Parts List…….……………………...........113
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

32” LCD TV AOC L32W581B
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Revision List
Revision Date Revision History TPV Model
A00 Mar-29-07 First Version Release E326MTNBD1A1NP
A01 Oct-27-07 Update BOM in Item 12 E326MTNBD1A1NP
Add new BOM in Item 13 E326MTNBW1AC2N

32” LCD TV AOC L32W581B
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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 may 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 radiation 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.)

32” LCD TV AOC L32W581B
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1. General Specifications
Feature 32” Wide Screen LCD TV
Items Specification
LCD Panel
Screen Size 32” TFT-LCD Panel
Aspect Ratio 16:9
Resolution 1366 x 768 (WXGA)
TV Function
TV Tuning System
Analog PAL B/G,DK,I and SECAM L/L’(Multi-Europe)Full
Channel with Electronic PLL Tuner
Digital
COFDM Band Width:7/8 MHz Format: MP@ML
Aspect ratio:4:3,16:9 Picture Resolution:720 x
576i
Sound System
Analog Nicam/A2
Digital MPEG(I&II)Sample rate:32/44.1/48KHz
Mode: Mono, Stereo, Dual
Teletext Yes(1000Pages)
Color systems PAL/SECAM
Video Inputs
SCART (RGB+CVBS) x1,(S-Video + CVBS )x1
AV1 RCA(Composite) x 1 Audio L/R x 1
(Share)
S-Video S-Video x 1
HDTV YPbPr x 1 Audio L/R x 1
(Share)
AV 2 RCA(Composite)x1
HDMI HDMI x 1
PC card slot PCMCIA x 1
PC mode
Signal input Analog: D-Sub 15 pins (separate)
Plug and play compatible DDC 2B
Input frequency Analog: FH:31.5kHz to 50kHz , FV:60Hz to 75H
Recommended Analog: 1024x768 (60Hz)
Audio input Used as a stereo earphone mini jack (3.5 ø)
Audio Output Audio output: L/R
Speaker (built-in):2*10 watt speakers
Headphone: Mini-jack for stereo (3.5ø)
Line Output (RCA L/R)
OSD language
English, German, Italian, French, Spanish, Portuguese, Swedish, Finnish, Dutch, Russian.
Wall Mount VESA (200+200)*200 mm
Power Power supply AC100V~240V, 50/60Hz
Power Consumption <180W
Dimension W x H x D (with stand) 810*605*236 (mm)
Weight KG(W/O Accessories) 15.6 kg
Regulations CE, SASO, Gost-R
Accessories Remote control with batteries(AAX2),AC power cord, UG, QSG,

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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.
VIDEO
Press this key you could select AV1,
AV2, S
-VIDEO, HDTV and HDMI.
SCART
Press this ke
y you could select
SCART 1
，SCART2-AV，
and SCART
2
-S.
0~9
DIGIT BUTTONS
To select a TV channel.
SUBPAGE
Teletext Sub
-page function.
Source
Select your input source: press
repeatedly to select TV, PC, SCART,
S
-VIDEO or HDMI mode, according
to where you conne
cted your
external source.
SOUND
To select Mono/ Stereo/Dual from
TV RF input.
DTV MENU
Press this key to display DTV menu.
Zoom +,
-.
Press these key to select desired
picture format.
(4:3, CINERAMA,16:9)
VOL
Press + or
– (or MENU or
button) to
increase or decrease the
volume.
MENU
Press this key to display main menu.
D I S P L AY
Press this key to display:
(1) the channel number
when
watching a TV program.
(2) the input source when
watching an AV program.
MUTE
Temporarily interrupt the sound or
restore it.
PC
Display PC mode
TV
Display TV mode
PRE
-CH
To display the previously selected TV
channel.
PIP
Press this key to display PIP/PAP
screen.
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 disappea
red.
CH
Press
or (or MENU ▲/▼
button)
buttons to scroll through the
channels
.
EXIT
Press this key to exit main menu.
OK
Press this KEY to validate your
selected.
< >
button
Use this button to confirm
selection or adjust the desired
parameter; other
wise, to
increase /decrease the
volume.
button
When in menu mode, use this
button to select to the
up/down; otherwise, to change
TV channels.

32” LCD TV AOC L32W581B
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TELETEXT
Teletext is an information service organized like a magazine, which is provided by some TV stations in addition to
regular television broadcasting.
TELETEXT
Press TELETEXT. The Teletext screen appears.
To turn off the Teletext mode, press TELETEXT again.
MIX
Press MIX to superimpose the Teletext over a normal broadcast
picture. Press again to return to Teletext mode.
SIZE
Press SIZE repeatedly to display the upper Teletext part, the lower
Teletext part and then to return to the normal.
RED / GREEN / YELLOW / BLUE
Use the COLOURED BUTTONS to operate the Teletext screen.
i INFO
Press i-INFO to show DTV information.
INDEX
Press INDEX to return to the main index page.
SUBTITLE
Press SUBTITLE to select the next page marked as a subtitle page
and request it as the display page.
HOLD
Press HOLD to hold the Teletext page when viewing information.
Press again to return to automatic page update.
REVEAL
Press REVEAL to display reveal hidden words e.g. quiz page
answers. Press again to hide.

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2.2 To Use The Menus
Analog OSD Functions
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.
MAIN MENU
Press the MENU button to display the Main menu. It offers the following options: Picture adjustments, Audio
adjustments, PIP/PAP adjustments, TV channels search menu (only in TV mode) and PC adjustments (only in PC
mode). It also allows to define your preferences in the Setup menu.
Video Adjustments
Display the Main menu by pressing MENU button.
Select the Video menu using the / buttons.
Press the OK button to confirm.
Use the / buttons to select each option.
Preset: choose Personal, Vivid, Standard or Mild.
Personal gives access to following adjustments.
Contrast, Brightness, Colour and Sharpness: adjust these settings as required using the / buttons.
Tint: This option is only available for NTSC audio-visual sources.
Adjust the tint of the picture using the / buttons.
Noise Reduction: When the signal is poor, you can turn on the noise reduction function
Color Temp: Choose Standard, Warm or Cold.
Press the EXIT button to exit the Video menu.
Note: This menu is removed automatically after a few seconds without using the remote control.
When you adjust a menu option (Contrast for example), the menu is replaced by a sub-menu as illustrated. Press
the OK button to return to the Video menu.

32” LCD TV AOC L32W581B
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Sound Adjustments
Display the Main menu by pressing MENU button.
Select the Sound menu using the button.
Press the OK button to confirm.
Use the / buttons to select each option.
Balance: Adjust the balance between left/right channels as required using the / buttons.
Bass: Adjust the bass level as required using the / buttons.
Treble: Adjust the treble level as required using the / buttons.
SRS WOW: Using /, activate (On) or deactivate (Off) SRS function.
SRS is an audio technology which improves the sound quality.
Press the EXIT button to exit the Sound menu.
Note: This menu is removed automatically after a few seconds without using the remote control.
When you adjust a menu option (Balance for example), the menu is replaced by a sub-menu as illustrated. Press the
OK button to return to the Sound menu.
PIP Adjustments
Press the MENU button to display the Main menu
Select the PIP menu using the button.

32” LCD TV AOC L32W581B
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Press the OK button to confirm.
Use the / buttons to select each option.
Dual Mode: Using / buttons activate (PIP/PAP) or deactivate (Off) the PIP/PAP function.
Following options are available if you have selected PIP or PAP at the PIP line.
Position: use the / buttons to change the position of the PIP frame on the screen.
Source: to select video source of the PIP/PAP, use the / buttons to select video source of the picture in the
PIP/PAP frame (TV or AV).
You can insert a TV picture while you are viewing an AV program or insert an AV picture while you are viewing a TV
program.
Video source can also be selected without the menu, using AV button on the remote control.
Audio select: to select audio source: MAIN (Main picture) or SUB (PIP/PAP picture), use the / buttons to select
audio source.
Press the EXIT button to exit the PIP menu.
Note: This menu is removed automatically after a few seconds without using the remote control.
Options
This menu allows to select the language for the menus as well as the colour of the screen when there is no video
input. It also allows to set an automatic shut-off time.
Display the Main menu by pressing MENU button.
Select the Options menu using the button.
Press the OK button to confirm
Use the / buttons to select each option.
Menu language: To select the language for the menu. Total have English, German, Italian, French, Spanish,
Portuguese, Swedish, Finnish,Russian and Dutch.
Menu timeout: To set an automatic shut-off time for Menu. Using / buttons select 5 > 10 > 20 > 30 > 40 > 50
seconds.
Menu background: Select Opaque or Transparent type.
Sleep Timer: To set an automatic shut-off time. Using / buttons select Off > 15 > 30 > 45 > 60 > 90 > 120
minutes.
Once the time is ended, TV set automatically switch on standby mode.

32” LCD TV AOC L32W581B
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If you turn the TV on standby mode after setting the sleep timer, setting will be erased. Set it again.
Note: You can display the remaining time before the automatic shut-off. To do that, press the sleep button.
To cancel the automatic shut-off, press several times the sleep button to display Sleep timer Off.
Blue Screen: To have a blue screen when there is no video input.
Using the / buttons select On.
Select Off if you do not want the blue screen.
Teletext language: Using / buttons, select the character set that will be used for Teletext on this channel.
The following character sets are available: West Europe, East Europe, Cyrillic (Russia), Greek, Arabic, Persian.
The character set determines how characters are displayed on Teletext screen.
PC Timing: Select PC Timing to 1360x768 or 1280x768.
Reset: Reset to default, except the OSD language, video and audio adjustment by personal.
Press the EXIT button to exit the Options menu.
Note: This menu is removed automatically after a few seconds without using the remote control.
TV Set Up
Channels search involves selecting all the settings required to be able to search for and store all the channels you
can receive.
Make sure that the television is switched on and follow all the steps in turn specified on this page.
Display the Main menu by pressing MENU button.
Select the TV set up menu using the button..
Press the OK button to confirm.
Use the / buttons to select each option.

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Auto Search
Select Auto Search using the button.
Press the OK button to display the Auto Search menu.
Use the / buttons to select each option.
Country: Select the relevant country using the / buttons.
This is the country you are in, or the country whose channels you want to receive if you live near its borders. If you
do not find your country, select Auto.
Start: Press OK button to start channels searching.
Manual set-up
Select Manual search using the button.
Press the OK button to display the Manual search menu.
Use the / buttons to select each option.
Prog. number: Allows to select the program on which you want save a new channel or a program you want to
modify.
Using the / buttons, select the program.
Frequency: Allows to enter a specific frequency for tuning.
Using the button, select the Frequency option and press the OK button.
Using the 0~9 digit and / buttons, enter desire frequency and press the OK button.
Name: Allows to edit the channel name.
Using the button, select the Name option.
Using the button select the first letter field.

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By pressing the 0~9 digit repeatedly and using the following table select the first character.
Repeat the procedure for each letter field.
BUTTON AVAILABLE CHARACTERS
1 1 Space — • !
2 2 a b c @
3 3 d e f #
4 4 g h i $
5 5 j k l %
6 6 m n o ^
7 7 p q r &
8 8 s t u v
9 9 w x y z
0 0 * # ( )
Store prog.: Allows to Save a channel on a new Program No. or to Insert a channel on an already existing Program
No. (The channel previously saved on this program No. will be shifted to the uper program.).
Once a channel has been found and named, use the button to select the Store prog. option.
Using the / buttons, select Save or Insert and press the OK button to confirm.
System: Allows to change the audio norm.
Using the button, select the System option.
Using the / buttons, select the norm.
The audio norm change will also change broadcasting system. Not suggest to change the audio norm if you are not
sure the audio system.
Skip: Allows to skip a channel.
Using the button, select the Skip option.
Using the / buttons, select On, the channel will be skip.
Repeat this procedure to skip other channels.
Fine tuning: If the picture is not clear, you can adjust the setting.
Using the button, select the Fine Tuning option.
Use the / buttons to find the good tuning point.
Manual search: Allows to launch a manual search.
Using the button, select the Manual search option.
Using the / buttons, start the search in decreasing or increasing order.
The menu is replaced by a sub-menu showing the progression of the search.
The search will stop at the first channel found, Manual search menu is displayed again (within 3 seconds).
If you wish to memorize the channel, select Store Program option using button and proceed as indicated in
previous page. Otherwise, continue the search using / buttons.
If you have modified System, Skip, Fine tuning options or if you have launch a Manual Search, select Store Prog.
option using / buttons and proceed as indicated above to save your modification.
Press the EXIT button to exit the TV set up menu.
Note: This menu is removed automatically after a few seconds without using the remote control.

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PC Mode OSD Instruction
In PC mode, main menu is different from the one in TV mode.
Please select PC as main input.
PC Settings
Display the Main menu by pressing MENU button.
Select the PC menu using the button.
Press the OK button to confirm.
Use the / buttons to select each option.
H. position: Use the / buttons to move the picture horizontally on the screen.
V. position: Use the / buttons to move the picture vertically on the screen.
Focus: Adjust as required to improve the picture quality.
Auto adjust: this function is used to automatically adjust the VGA input. Press the / buttons to start the
adjustment process.
Tone: To adjust the colour temperature at your convenience.
Reset : Return to default settings. Press OK button to return to default settings.

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2.3 LCD TV Description
The LCD TV will contain a main board, a power board, an IR board, a key board, an IO board and an audio
Board. The main board and power board will house the flat panel to control logic I²C bus, DDC, brightness
control logic for LCD panel, DC-DC conversion to supply the appropriate power to the whole board and
transmitting TTL level signals into LCD Module to drive the LCD display circuit.
The inverter board will drive the CCFLs (Cold Cathode Fluorescent Tube).
The switching power board will provides the power ON/OFF to control the TV and control LED indicator for
DPMS.
The function keyboard and Remote Control will provide the OSD control signal to the Main Board.
2.4 Interface Connector
(A) Power Cord Connector.
(B) RF Signal Connector.
(C) Video / Audio Signal Connectors.
(D) PC D-sub 15 pin Connector.
(E) PC Audio Connector
(F) Composite Connector
(G)Component Connector
(H) S-Video Connector
(I) HDMI Connector
(J) SCART Connector
(K) Headphone Output Connector

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3. White Balance, Luminance Adjustment
Instrument List:
Chroma 2225、VG848、Chroma 7120
Adjustment Process:
①Instrument Orientation
Connect LCD-TV、Chroma 2225 and VG848, and set Timing137、Pattern1 on Chroma2225. Chroma7120’s lens
must aim at the center of Pattern1 showed on the LCD-TV’s screen. The distance of Chroma7120’s lens and the
center of screen is 20cm±1cm.
②ENTER FACTORY
After orientation OK, set Pattern104(black picture) on Chroma225.Press 1-9-9-9 on remote to enter the menu
on top left of the screen(refer to fig.1,this menu will show slowly), then from UP key(△) option to enter the menu
(refer to fig.2).
Fig.1

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Fig.2
Fig.3
③PC Mode White Balance Adjustment
Begin to adjust the W/B (White Balance) you should select the Color Temp and enter the son menu from father
menu “Scaler” refer to Fig.2 and Fig.3.
Set channel color temperature value and brightness on Chroma7120.Set 303 319 350(7200K) on CH1 and
278 289 350(10300K) on CH1.Press MODE key on Chroma7120 to switch xyY mode.
Use black sleeve on Chroma7120’s lens to ensure no external ray. Set Pattern104 on Chroma2225.Adjust
SCALAR RB、GB、BB value to make sure the brightness is the lowest, then set Pattern105 on Chroma2225 and

32” LCD TV AOC L32W581B
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adjust RG、GG、BG value to make the value displaying on Chroma7120 is about 100.Press “Save” to save. Switch
to CH1, select 10300K Temp and then adjust it according to above method. Press “Save” to save.
④AV MODE W/B ADJUSTMENT
Begin to adjust AV/COMPONENT YPbPr(480I/576I)/COMPONENT T-scaler(480P/720P/1080I) /HDMI W/B,
their Color Temp modes refer to Fig.4/5/6/7
Fig.4
Fig.5

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Fig.6
Fig.7
1.OFFSET(26%) W/B ADJUSTMENT(This is only for AV/TV)：Change the input signal to 26% white level
performance .Set the CHROMA7120 to 288 301 30 and MODE_RGB ,then adjust the TV’s RB、GB、BB to make
CHROMA7120 display to 100.
2.W/B ADJUSTMENT (100%): Change the input signal to 100% white level performance. Set the
CHROMA7120 to 288 301 415 and MODE_RGB , then adjust the TV’s RG、GG、BG to make CHROMA7120 display
to 100.
3.Save the adjustment. Then change the input signal to 26% white level performance. Set the CHROMA7120 to
MODE_RGB and CH1, check whether the color temperature was in SPEC (color spec is x±15;y±15;Y>370). In this
time, most of the TV is in SPEC, while the others should be adjusted twice or more to make its color temperature in

32” LCD TV AOC L32W581B
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SPEC.
4.CHECK CUT OFF: Change the input signal to 0% white level performance. Firstly, press the “brightness” from
50% to 0% and make sure the Y is not changed. Secondly, change the input signal to 32 GRAYS performance and
make sure the grays is not connected at any position.( as the 5% level is between the first gray and the second gray.
5%=（1/32）*1.6)
1.The white color temperature in PC Mode should be app.7200K(CIE1931: x=0.303, y=0.319，Y>350),
10300K(CIE1931 : x= 0.278, y= 0.289, Y>350 ).
2.The white color temperature in AV/TV Mode should be app. 8700K(CIE1931:x=0.288±15, Y=0.301±15,
Y>370). In this Mode, we should check the black balance, which level is 26% of the white level(0.7Vpp).
3. The white color temperature in HDTV/HDMI Mode should be app. 8700K(CIE1931:x=0.288±15,
Y=0.301±15, Y>370).
Those three channels should be factory preset and not be possible to be modified.
The measurement position is the center of the display(5) at brightness set to center and Contrast set to max. .
The tolerance of the color coordinates should be less than ± 0.015.

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4. Input/Output Description
4.1 D-SUB Connector
This procedure gives you instructions for installing and using the LCD TV display.
1. Position the display on the desired operation and plug the power cord into a convenient AC outlet.
Three-wire power cord must be shielded and is provided as a safety precaution as it connects the chassis
and cabinet to the electrical conduct ground. If the AC outlet in your location does not have provisions for
the grounded type plug, the installer should attach the proper adapter to ensure a safe ground potential.
2. Connect the 15-pin color display shielded signal cable to your signal system device and lock both screws
on the connector to ensure firm grounding. The connector information is as follow:
1
6
11
15
5
10
15 - Pin Color Display Signal Cable
Pin No. Description Pin No. Description
1 Red Video 9 +5V Supply
2 Green Video 10 Sync Ground
3 Blue Video 11 GROUND
4 Ground 12 Serial Data for DDC
5 Ground 13 H-Sync.
6 Red Ground 14 V-Sync.
7 Green Ground 15 Data Clock (SCL) for PC Bypass
8 Blue Ground
3 Apply power to the display by turning the power switch to the "ON" position and allow about ten seconds
for Panel warm-up. The Power-On indicator lights "BLUE" when the display is on.
4. With proper signals feed to the display, a pattern or data should appear on the screen, adjust the
brightness and contrast to the most pleasing display, or press auto-adjust to get the best picture-quality.
5. This TV (with PC function) has power saving function following the VESA DPMS. Be sure to connect the
signal cable to the PC.
6. If your TV requires service, it must be returned with the power cord.