AOC L26WA91 User manual

26Ǝ&32Ǝ&42ƎLCD TV AOC L26WA91&L32WA91&L42HA91
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 VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
6.1 Main Board………………..……………...…..…......41
6.2 Power Board…..…………..………….…..…….......43
6.3 Key Board………………………..……..……….......53
6.4 IR Board…………………………..……….…….......53
7.Adjustment...............................................................54
8.Block Diagram.…….................................................55
9.Schematic Diagram………..……..………………......56
9.1 Main Board…………….…………………...….........56
9.2 Power Board………..…....…………...……….........70
9.3 Key Board……………….………….………….........84
9.4 IR Board…………..………………….………..........85
10.Exploded View…………………….………….….......87
11.BOM List……………….…………….…………….....95
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 Menus...……………………….………......6
2.3 How to Connect……..…………………….………......13
2.4 Front Panel Control Knobs……………….………......17
3. Input/Output Specification…………....................…....18
4. Mechanical Instructions…………………….................21
5. Repair Flow Chart ……………………….…….…….....34
6. PCB La
y
out ………………..………………....…..........41

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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 Customer Model TPV Model
A00 Oct.29,2009 Initial Release
L26WA91 E269G2NB4WA12N
L32WA91 E329M2NB4WA12N
L42HA91 E429M2NB4WA12N
A01 Jan.18,2010
Add new models,for L32WA91
E329M2NB4WG22N,lead in the
new power board
(PCB
P/N:715G3690P01000003M)
L26WA91
E269G2NB4WAC2N
E269G2NB4WG12N
L32WA91
E329M2NB4WAC2N
E329M2NB4WG22N
L42HA91
E429M2NB4WAC2N
E429M2NB4WG12N
E429M2NB4WG22N
A02 Dec.24,2010 Add new model L32HA91 E329G2NB4WG22N

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1. General Specification

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2. Operating Instructions
2.1 The Use of Remote Control

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2.2 To Use the Menus
OSD Settings
1. Press the MENU button on the side of the TV or press the MENU/EXIT button on the remote control to display or
close the main menu.
2. Use the Navigation Ring to move around to select, adjust or confirm an item in the OSD (On Screen Display)
menu.
Menu Descriptions
Picture Show more picture modes and functions based on your favourite channels and enables you to adjust
the colour and brightness setup.
Sound Provide more audio selections. You can also set the audio environment of the TV.
TV Enable you to adjust special functions for country, audio language and the TV channel.
Features Enable you to adjust settings of the TV channels and language.
Parental Enable you to control special functions for the TV channels.

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Picture
Menu Descriptions
Smart Picture To set the best picture appearance to a predefined picture setting from Standard,
Vivid, Movie, Eco, or Personal.
Brightness To brighten the dark parts of the picture.
Contrast To sharpen the picture quality.
Colour To add or reduce colour.
Tint To adjust the picture tint.
Sharpness To improve detail.
Colour Temperature To choose between Normal (neutral), Warm (redder), and Cool (bluer).
Advanced Control
Noise Reduction To filter out and reduces the image noise and improve picture quality.
Select the effect degrees from Off, Low, Medium, High, or Auto.
Flesh Tone To adjust the skin colour to be more natural.
Back light To make the background colour brighter or darker.
DCR Dynamic Contrast Ratio (DCR) auto adjusts the brightness of the screen to show
more depths in the darker areas.
Wisdom Light (32”/42”
with light sensor model
only)
To enable the light sensor to adjust brightness automatically by detecting ambient
light. Set the sensor on or off.
HDMI mode (HDMI only)
User can select Auto/graphic/Video mode. Description as following:
Auto
Automatic to get device information, device will indicate sending timing is video
timing or graphic timing (PC timing).
Graphic
Force video timing shows as graphic timing, for example: 720p shows
1280x720@60Hz; 1080p shows 1920x1080@60Hz. This mode optimises for PC
input.
Video
Force graphic timing shows as video timing, for example: 1280x720@60Hz shows
720p; 1920x1080@60Hz shows 1080p. This mode optimises for DVD player,
camcorder, and other video appliances inputs.

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Sound
Menu Descriptions
Sound Mode To set the TV to a predefined sound setting from Personal, Music, or Speech.
Balance To adjust the balance between left and right channels.
Virtual surround To add greater depth and dimension to the TV sound.
Digital Audio Out To select the Digital Audio Out from Off, Dolby Digital, or PCM. Tip: When Dolby Digital is
selected, make sure the amplifier supports digital audio.
SPDIF Delay
SPDIF Delay function will affect SCART/Line out audio also delay at that time. The NorDig HD
IRD shall support the possibility to adjust the audio-delay on the SPDIF output (if available) up
to 250 ms and it should be adjustable in 10ms steps, as the IRD may have several different
user set-ups, resulting in different a/v delays; e.g. the IRD may be connected to several types
of external audio-amplifiers and the STB may be connected to several types of external
screens.
AVL To eliminate the volume differences between channels and programs and reduce the
dynamics of sound.
The following functions are only available for digital channels with audio signals.
Type
This function enables you to choose the type of the additional narration during the TV
watching from Normal, Hard of Hearing, or Audio Description. Hard of Hearing: This function
provides narration to deaf and hard of hearing viewers.
Audio
description
When the Type is set to “Audio Description”, you can adjust the volume of the audio
description.

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TV
Menu Descriptions
Country To select the relevant country. This is the country you are in, or the country whose channels
you want to receive if you live near its borders.
Audio Carrier
(ATV only) Select Stereo, Dual 1, Dual 2, or Mono for ATV channel.
1st and 2nd
Audio
Use this function when two or more audio languages are broadcast. This is the language to be
used for digital channels if it is available.
Channels
Enter the channels submenu, and choose from Channel Scan, Update Scan, Single RF Scan,
Analog Manual Scan, Channel Skip, Channel Sort, Channel Edit, Decoder, and Analog CH
Fine Tune.

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TV/Channels
Menu Descriptions
Channels
Channel scan
Channel Scan will re-tune the television automatically. It is recommended to run the Channel Scan
periodically to ensure that all new services are added.
Update scan
Search the new channels automatically that are not in the channel list.
Single RF Scan (Digital Only)
Enter the Single RF Scan in the Channels submenu to scan digital channels.
Analog Manual Scan
The television can be tuned-in manually using Analog Manual Scan. Use the number keys to enter
the Start Frequency to scan up or scan down.
Channel skip
To prevent certain programs from being viewed by pressing CH + / - buttons on the remote control,
the program position can be skipped. Tip: The skipped program may not be found by pressing CH + /
- buttons but can be access by pressing number buttons directly.
Channel sort
Change the order of the Channel List.
Channel Edit
Enter the Channel Edit in the channels submenu to edit the channel number and channel name by
using the number buttons 0~9. Note: The following RC number-mapping table will not be shown on
the TV screen.
Decoder (Analog only)
Channel Decode support the Canal+ (paid television channel); however, the channel also broadcast
some un-encrypted programs. These programs without encryption can be viewed free of charge.
Analog CH Fine Tune
Select Analog CH Fine Tune in the Channels submenu to adjust the frequency.

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Features
Menu Descriptions
Menu Language To select the on-screen display menu language.
Picture Format To select the available display format from Auto, Normal, Native (HDMI only), Wide,
Zoom 1, or Zoom2.
Time setup
Time Zone
To select the time zone you are in.
Time
To set the time and date or select auto synchronization. Tip: Before you want to set the
time and date by your own, please make sure Auto synchronization is Off.
Sleep Timer
To set the TV to turn itself off within a certain time.
Subtitle
Analog Subtitle
To display the transmitted subtitle on the screen. Either this text can be permanently
displayed (assuming that the service is available in the broadcast) or only when mute is
active.
Digital Subtitle
Use the Digital Subtitle function when two or more subtitle languages are broadcasted. If
subtitle data in a selected language is not broadcasted, the default language subtitle will
be displayed.
Subtitle Type
To choose the subtitle type from normal or hearing impaired.
Teletext Language
Digital Teletext Language
To select the teletext language.
Decode Page Language
To set the teletext language to the regional location.
Common Interface This menu appears with your CI supplier information.
HDMI Scan Info
(HDMI only)
Automatic
Set to underscan or overscan automatically when the video signal is detected.
Underscan
When the video signal is detected, all active pixels and lines are displayed with or without
border.
Overscan
When the video signal is detected, some active pixels and lines at the edges are not
displayed.
Reset Default To reset all TV settings to the original factory values.

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Parental
Menu Descriptions
Channel Block To block certain TV channels.
Parental Guidance
To control access programs based on their age ratings. All settings apply to digital
channels. Note: This function operates according to information from the broadcasting
station. Therefore if the signal has no information, this function does not operate.
Input Block To disable the specific external input signals.
Set Password
To set or change your password. Please follow the instructions to set it. All member
combinations from 0000 to 9999 are valid. Tip: Remember that 5351 is the default Change
Password code. If your access code has been changed or you have forgotten the code,
you can always get in by inputting the default code.
Clear All To clear all the settings in the parental submenu.

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2.3 How to Connect
TV Connectors
Rear View
Light Sensor: Detecting the ambient light to adjust the contrast and brightness automatically for comforting viewing.
Power Switch: The TV is not completely powered off in standby mode. To turn off the TV, please turn off the power
switch.
Wall mounting
TV screen size (inches) VESA-compatible wall
bracket (millimeters) (W x H) Screw type Unit without base weight
26” 200 x 100 mm Metric 4 x 10 mm 7.0 kg
32” 200 x 200 mm Metric 6 x 10 mm L32WA91:10.9 kg
L32HA91: 9.5kg
42” 200 x 200 mm Metric 6 x 10 mm 18.6 kg

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Remove the TV stand for wall mounting

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Rear Connections

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Side Connections

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2.4 Front Panel Control Knobs

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3. Input/Output Specification
3.1 RGB Signal Input
Pin No. Description Pin No. Description
1 Red 9 +5V (Supply From PC)
2 Green 10 Sync GNDʳ
3 Blue 11 GND
4 GND 12 Bi-Directional Data(SDA)
5 Self Test 13 H. Sync
6 Red Ground 14 V. Sync
7 Green Ground 15 Data Clock(SCL)
8 Blue Ground
3.2 HDMI Digital Connector
Pin No. Description Pin No. Description
1 TMDS Data2+ 11 TMDS Clock Shield
2 TMDS Data2 shield 12 TMDS Clock-
3 TDMS Data2- 13 CEC
4 TMDS Data1+ 14 Reserved (N.C. on device)
5 TMDS Data1 shield 15 SCL
6 TMDS Data1- 16 SDA
7 TMDS Data0+ 17 DDC/CEC Ground
8 TMDS Data0 shield 18 +5V Power
9 TMDS Data0- 19 Hot Plug Detect
10 TMDS Clock+
HDMI CEC Defined
zOne-Touch-Play- device can switch on the television (when in standby) and switch to the relevant HDMI
source. Allows a device to be played and become the active source with a single button press
zRouting Control- This feature is used to control the routing of the HDMI network, by controlling CEC Switches.
In general whenever a device starts being streamed to the TV
zSystem Standby - Enables the user to switch all devices to standby with one button press.
zVideo-format selection - The system will automatically select a video transfer mode that does not degrade the
performance of viewing content. (not part of CEC features, but it still need to implement in HDMI v1.3)
zSystem Information- allows devices to automatically use the same OSD and Menu language settings as the TV
and also for a TV to discover the current language when it is being installed.
zDevice Menu Control - Enables a device to control the menu of another device by passing through user
interface commands (SW no Support).
zGive Device Power Status-The message is used to determine the current power status of a target device. The
target device responds with a message containing the Power Status operand.
ǂFeature About- Feature abort.

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3.3 Full Scart Connector
Pin No. Description Pin No. Description
1 Audio Output Right 12 N.C.
2 Audio Input Right 13 GND(Red)
3 Audio Output Left 14 GND(Blanking)
4 GND(Audio) 15 Red Input
5 GND(Blue) 16 RGB Switching Control
6 Audio Input Left 17 GND(Video Input & Output)
7 Blue Input 18 GND(RGB Switching Control)
8 Switch Signal Input (Fast Blanking) 19 Video Output(Composite)
9 GND(Green) 20 Video Input(Composite)
10 N.C. 21 Common Ground
11 Green Input
3.5 Video/Audio Signal
ƔTV RF input system - Aerial or cable should support PAL/SECAM/DVB-T
ƔTV RF input level - 10mV (80dBuV) typical, 30dBuV ~ 100dBuV receiving capability, terminated with input
impedance of 75:.
ƔCVBS input - 1000mVpp (including 300 mV sync level), terminated with input impedance of 75:.
ƔS-Video input - Y: 1000mVpp (include sync), C: 300mVpp terminated with Input Impedance of 75:.
ƔComponent video input - Y: 1000mVpp (include sync), PbPr: 700mVpp terminated With Input impedance of 75:.
Support 480i/p, 576i/p, 720p, 1080i at 50Hz or 60Hz refresh rate.
ƔAudio input - Sensitivity 500mV (rms). For rated power, the amplifier should be able to handle input
signal up to 2.0V, input impedance >10K:.
ƔSCART input / output - Full SCART, includes RGB in, CVBS (audio L/R) in/ (Monitor out).
Half SCART includes S-Video in, CVBS (audio L/R) in/ (Monitor out).
ƔHDMI (High Definition Multimedia Interface)-
Support 480i /480p, 576i/576p, 720p, 1080i format with HDCP Digital interface with 4
channelsTMDSsignal
ƔCI Slot - PCMCIA card 5V input.
ƔPC VGA input - 700 mV input level, TTL level sync, RGB in, 75:impedance.
ƔPC Audio input - 500 mVrms input level, impedance > 10 k:.
ƔHeadphone output - 5mW (Typ.) at 32:, impedance between 8 - 600:.
ƔSPDIF output - Level: +/- 0.5V Square Wave. SPDIF output sync SCART audio out.
ƔAmplifier output - 5 W+/-10% (for 26”); 10W+/-10% (for 32” and 42”);
ƔSpeaker- 8:(for 26”); 6:(for 32” and 42”);

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3.6 Video Input Format
Physical Inputs Format
PAL from RF 720 x 576 @50i
SECAM from RF 720 x 576 @50i
Side, SCART (CVBS,RGB and Y/C) 720 x 576 @50i
720 x 480 @60i
Component
720 x 480 @60i
720 x 480 @60p
720 x 576 @50i
720 x 576 @50p
1280 x 720 @60p
1280 x 720 @50p
1920 x 1080 @60i
1920 x 1080 @50i
HDMI
720 x 480 @60i
720 x 480 @60p
720 x 576 @50i
720 x 576 @50p
1280 x 720 @50p
1280 x 720 @60p
1920 x 1080 @50i
1920 x 1080 @60i
1920 x 1080 @25p
1920 x 1080 @30p
640 x 480 @60Hz
800 x 600 @60Hz
1024 x 768 @60Hz
1360 x 768 @60Hz