AOC L32W761 Diagram
26’’ LCD TV Envision L26W761
Service
Service
Service
31-60 kHz
TABLE OF CONTENTS
Description Page Description Page
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……………….……….....13
3. Input/Output Specification…………....................…....14
4. Mechanical Instructions…………………….................16
5. Repair Flow Chart ……………………….…….…….....20
6. PCB Layout ………………..………………....….......25
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
6.1.Main Board…………..………….……….......25
6.2.Power Board……………..………….……….......28
6.3. Key Board……………………………..……….......31
6.4. IR Board….. ………………..……………....….....31
7. White-Balance, Luminance Adjustment...................32
8. Block Diagram.……...........................................34
9. Schematic……………...…………..………………...35
9.1 Main Board…….…………..……………….….......35
9.2.Power Board…………….……….………….......48
9.3.Key Board……………….……….………….......49
10. Exploded View..……………............................…..50
11. BOM List……………….………………………….….51
12.Different Parts List…………………………………78
Horizontal Frequency
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
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26’’ LCD TV Envision L26W761
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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26’’ LCD TV Envision L26W761
Revision List
Version Release Date Revision Instructions TPV Model
E267AZNK2WE1NN
A00 Oct.-18-2007 Initial Release
E267AZNK2WE1NG
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26’’ LCD TV Envision L26W761
1. General Specification
Items Specification
Panel Type 26” T260XW03 V0 TW panel
Driving system TFT-LCD AUO Panel
Aspect Ratio 16:9
Resolutions 1366 x768
LCD Panel
TV Function
Video Inputs
Audio Output Audio Output: L / R
OSD language English, etc
Wall Mount VESA 200 mm x 200 mm
Brightness
Contrast 800:1
Pixel Pitch 0.4215mm x0.4215mm
Display colors 16.7 million
Color Temperature Cool / Warm/normal
TV Standard ATSC, NTSC,8-VSB,Clear-QAM
Color systems ATSC, NTSC
Closed Caption / V-chip For USA
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
HDMI 720p,1080i,480p,480i
cd/㎡
500
Speaker (built-in): Two 10W speakers
Headphone Mini-jack for stereo (3.5ø)
Power
Environment
Power Supply AC100V~240V, 50/60Hz
Power Consumption ≤180W
Standby <1W
Operating + 0 °C ~ + 40 °C
Storage - 25 °C ~ + 60 °C
Operating 10% ~ 85%
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26’’ LCD TV Envision L26W761
)
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2. Operating Instructions
2.1 The Use of Remote Control
POWER
Press to power ON/OFF (standby)
TV.(Note:1.TV is never completely
power off unless physically unplugged.
2.Press to turn on TV after the power
on status LED had changed to the
amber color and stopped flashing. )
VIDEO
Press repeatedly to choose S-Video/
Composite source mode (Video 1 ~
2).
COMP
Press repeatedly to choose
Component
source mode (Video3).
PC
Press repeatedly to choose VGA
or HDMI source mode (Video 4 ~
TV
Press to choose ATSC/NTSC TV
source mode.
0 ~ 9 /- number
Press to enter TV channel
number to select channel
(Press ‘-’ to indicate choosing
the sub-channel
SLEEP
Press to set a time period
(off/30min/60min/90min)after
which the TV should switch itself
to standby mode.
FREEZE
Press to freeze the displayed
icture
VOL- / VOL+
Press + or - to adjust the volume.
MENU
Press to open or exit menu.
“”,“”,“∧∨＜”,“＞”,“OK
Press to adjust the various
function items on the menu.
.
5
DISPLAY
Press to show the information about
the input source、TV channel、
display resolution and current time.
MUTE
Press to set TVsound mute
ON/OFF
PREV CH
Press to display the previous TV.
MTS/SAP
Press to activate the NTSC TV
sounds, such as: Stereo, SAP or
Mono tone.
WIDE
Press to choose the display aspect
as: Normal, Wide, Zoom or
Cinema mode.
SOURCE
Press repeatedly to choose the
various input sources (Video 1 ~ 5).
CH-/ CH +
Press + or - to browse through the
TV channels.
Exit
Press to exit menu or OSD.
VIDEO ADJ
Press to choose the Brightness or
Contrast adjustment.
AUDIO ADJ
Press to switch the ATSC
multi-channel TV sounds.
CC
Press repeatedly to change cc
on/cc off/cc on when mute
EPG
Press to show the information the
same as “DISPLAY” key.
FAV
Press to turn on/off favorite mode
(use CH up and down to change
after setting thefavorite TV channel
on main menu).
V-CHIP
Press to lock / unlock Parental
Control temporarily. (After setting
the restricted table of MPAA or TV
Rating.)
26’’ LCD TV Envision L26W761
2.2 To Use the Menu
1. Press the MENU button to display the main menu
2. Use the cursor up/down to select a menu item.
3. Use the cursor left/right to enter a submenu.
4. Press the OK button to enable/disable the function.
5. Press the MENU or EXIT button to exit the menu.
MAIN MENU
The Setup menu in TV mode shows as below. In others source modes, the Setup menu only shows Menu
Language and Aspect Ratio items.
1. Tuning Band: Select TV source signal from the Air (antenna) or Cable (CATV).
2. DTV Signal: Show the intensity of the received DTV signal.
3. Auto Ch Search: Automatically scan all NTSC / ATSC TV channels and then store in the channel table. In
channel scan process, the OSD can display the number of channels which had been found.
4. Add on Ch search: Add channels which are new found.
5. Manual Channel Set: Show the channel setup table. User can choose to display the ATSC or NTSC TV channels
and then edit (add/delete) the channel numbers.
6. Channel Labels: Show the NTSC / ATSC TV channel label menu for user modifying channel labels specifically.
7. Menu Language: Select the menu display language. (English / Espanol / Francais)
8. Aspect Ratio: Select the display aspect ratio. (Normal/Zoom/Wide/Cinema)
9. Favorite Channel Mode: When favorite channel mode on user can edit favorite channel table in favorite channel
set option.
VIDEO MENU
The Video menu in most source modes shows as below. It provides several video adjustment items for user fine
tuning the video display. Only in VGA source modes, the Video menu simply provides Contrast, Brightness, Back
light and Settings (Preset) items.
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26’’ LCD TV Envision L26W761
1. Contrast: Video contrast adjustment, the tuning range is 0 ~ 100.
2. Brightness: Video brightness adjustment, the tuning range is 0 ~ 100.
3. Sharpness: Video sharpness adjustment, the tuning range is -50 ~ 50.
4. Color: Video color chroma adjustment, the tuning range is 0 ~ 100.
5. Tint: Video tint adjustment, the tuning range is R50 ~ G50.
6. BackLight: Backlight strength adjustment, the tuning range is 0 ~ 10.
7. Settings: Restore the default video settings.
AUDIO MENU
The Audio menu in TV mode shows as below. It provides audio adjustment for user to modify the audio setting.
Audio language setting is only available with ATSC TV source, the option is disable under other source modes.
1. Audio Language: Change the audio language setting on ATSC TV programs the number of the supported
audio languages depends on the ATSC TV programs.
2. Bass: Bass tone adjustment, the tuning range is 0 ~ 63. (The default state is enabled)
3. Treble: Treble tone adjustment, the tuning range is 0 ~ 63. (The default state is enabled)
4. Balance: Audio balance adjustment, the tuning range is L31 ~ R31.)
5. Digital Audio Output: Digital audio output format selection, user can choose RAW (default) or PCM format or
off.
6. TV Speaker: Choose to turn on / off the TV internal speaker. The digital audio output signals、earphone output
signals will not be turn-off even though the TV speaker is off. The default setting is on.
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26’’ LCD TV Envision L26W761
7. Settings: Restore the default audio settings.
FEATURE MENU
The Feature menu in TV mode shows as below. It provides certain optional control functions such as time set, sleep
timer, advanced video menu, Password Set, parental control (V-chip) and Digtal closed caption setting. This menu
gives users the most flexibilities to satisfy their generally demands. According to the various requirements in different
source modes, certain features should be hidden (disable) on the menu. The details footnotes will be described
clearly below.
1. Time Set: Set current time. This sub-menu includes Time Set Mode ,Time Zone and Time items. 【Time Set
Mode】user can choose Auto or Manual,【Time Zone】item provides user to set current time zone, such as:
Pacific、Alaska、Hawaii、Eastern、Central and Mountain.
2. Sleep Timer: Enable or disable the TV standby timer. User can set the TV standby timer
15 min/ 30 min / 45 min / 60 min/ 90 min / 120 min / 180min/ 240min. Timer starts to count down after cursor
leaving the sub-menu. (At the moment, the item shows 『** min Left』and the cursor highlights on the Feature
icon.)
【
Time】item provides user to set the time clock.
as off / 5 min / 10 min /
3. Advanced Video Menu: Provide the Noise Reduction、Color Temperature and 3D Y/C. Dynamic Contrast options
for enhancing video quality.
【Noise Reduction】gi
【Colour Temp】gives three color temperature modes as: Normal、Warm and Cool. The default mode is Warm.
【3D Y/C】provides On / Off switches. The default setting is On.
【 Dynamic Contrast】user can choose 0n or Off.
ves four NR effect degrees, such as: Low、Mid、High and Off. The default setting is Mid.
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26’’ LCD TV Envision L26W761
【Setting】restores the default advanced video option settings.
4. Password Set: Change the 4-numeral parental control password. Three steps are required for changing the
password: Enter Old Password -> Enter New Password -> Confirm New Password. Note: This item is only
available in TV, Composite and S-Video source modes. The default password is 『0 0 0 0』.
5. Parental Control: provide the parental Control (V-chip) function setting.
sub-menu, user has to key in the password first. Then enter the Parental Lock item, User can modify the
restricted table about MPAA or TV Rating respectively. While exiting the sub-menu, the parental control function
is working. The inhibitive channels or source signals can be un-lock through pressing the V-CHIP key on the
Before
entering the Parental Control
remote control and then key in the correct password. Note: This feature is only available in TV, Composite and
S-Video source modes. (The default password is: 0 0 0 0.)
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26’’ LCD TV Envision L26W761
6. Digital Captions: Select the close caption options ( Service 1-6, Text 1-4 and CC 1-4) in digital TV mode. When
select service 1 to service 6 you can modulate parameters in the Digital Close Caption.
7. Digital Close Caption: Provide numerous options for setting the digital close caption style. In the sub-menu.
【Style】item can be set as Automatic or Custom mode. If Custom mode is selected, user can modify the detail
styles described below. The setting result will be shown immediately on the bottom side of the sub-menu OSD.
Note: This feature is only available in Digital TV (ATSC) mode.
【Size】: Digital close caption font size, which can be set as Small、Normal or Large.
【Font】: Digital close caption font style, which can be chosen as Default or Font 1 ~ 7.
【Tex t C o lo r】: Giving Red / Green / Blue/ Yellow / Magenta / Cyan / Black / White Colors.
【Tex t O p ac i ty 】: Giving Transparent / Translucent / Solid / Flashing modes.
【Background Color】: Giving Red / Green / Blue / Yellow / Magenta / Cyan / Black / White Colors.
【Background Opacity】: Giving Transparent / Translucent / Solid / Flashing modes.
【Edge Effect】: The text edge effects, which gives None / Raised / Depressed / Uniform / Left Shadow / Right
Shadow modes.
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26’’ LCD TV Envision L26W761
【Edge Color】: The colors of text edge effects, which provides Red / Green / Blue / Yellow / Magenta / Cyan /
Black / White Colors.
8. Component Set: This option only shows and is available in component mode, which provides fine tuning
component display, such as: 【H-Position】、【V-Pos itio n】, 【Clock】,【Phase】 and【Auto Adjust】.All these
items are giving the tuning range from 0 to 100.【Setting】item providesthe default componentsetting values
restoring.
9. VGA Set: This option only shows and is available in VGA mode, which provides several items for the VGA display
fine tuning, such as : 【H-Position】、【V-P osition 】、【Clock】and 【Phase】. All these items giving the tuning range
from 0 to 100.【Setting】item provides the default VGA setting values restoring.
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26’’ LCD TV Envision L26W761
2.3 How to Connect
2.4 Front Panel Control Knobs
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26’’ LCD TV Envision L26W761
1 VOL▲
2 VOL▼
3 CH ▲
4 CH ▼
5 MENU
6 INPUT
7 POWER
VOL +: Press to increase the sound volume level.
VOL - : Press to decrease the sound volume level.
CH +: Press to select the next higher Program number.
CH - : Press to select the next lower Program number.
Menu key: Press
Source key: Press to select the input source.
Power key: Press to turn on / off (standby) the TV set.
(Please re-turn on TV after the Power-ON status LED had
changed to the orange color and finished flashing.)
to open or exit the OSD menu.
3. Input/Output Specification
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26’’ LCD TV Envision L26W761
3.1 RGB Signal input
1
6
11 15
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 SDA(Remote Control)
4 SCL(Remote Control) 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
3.2 HDMI Digital connector pin assignments
5
10
Pin No. Description Pin No. Description
1 TMDS Data2+ 2 TMDS Data2 Shield
3 TMDS Data2- 4 TMDS Data1+
5 TMDS Data1 Shield 6 TMDS Data1-
7 TMDS Data0+ 8 TMDS Data0 Shield
9 TMDS Data0- 10 TMDS Clock+
11 TMDS Clock Shield 12 TMDS Clock-
13 CEC 14 NC
15 SCL 16 SDA
17 DDC/CEC Ground 18 +5V Power
19 Hot Plug Detect
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26’’ LCD TV Envision L26W761
3.3 AV/S-Video/Component Video Inputs
AV (Composite Video input)
Video1
Amplitude 1.0 V (p-p), negative sync.
Impedance 75 ohm terminated
S-Video (Y / C input)
S-Video2
System NTSC
Y signal amplitude 1.0Vpp (including sync)
C signal amplitude 0.286Vpp
Impedance 75 ohm terminated
Component (Y, Pb/Cb, Pr/Cr input)
Video3
Y signal amplitude 1.0Vpp (including sync)
Impedance 75 ohm terminated
3.4 Compatible Mode Table
System NTSC
System 1080i, 480p, 720p, 480i
Cr, (R-Y) / Cb, (B-Y)
Signal amplitude
±0.35Vpp, 75 ohm
VESA MODES
Horizontal Vertical
Nominal
Mode Resolution Total
640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175
VGA
SVGA
XGA
WXGA 1360x768@60Hz 1792x795 47.712 P 60.015 P 85.5
640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500
640x480@75Hz 840 x 500 37.5 N 75 N 31.500
800x600@56Hz 1024 x 625 35.156 P 56.25 P 36.000
800x600@60Hz 1056 x 628 37.879 P 60.317 P 40.000
800x600@72Hz 1040 x 666 48.097 P 72.188 P 40.000
800x600@75Hz 1056 x 625 460875 P 75 P 49.5
1024x768@60Hz 1344x806 48.363 N 60.004 N 65.000
1024x768@70Hz 1328x806 56.476 N 70.069 N 75.000
1024x768@75Hz 1312x800 60.023 P 75.029 P 78.75
Frequency
(KHz)
Sync
Polarity
Nominal
Freq.
(Hz)
Sync
Polarit
y
Nominal
Pixel
Clock
(MHz)
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26’’ LCD TV Envision L26W761
5. Mechanical Instructions
1. Put the TV on a soft flat; remove the 4 screws to remove the base.
2. Remove the 11 screws to remove the rear cover.
3. Remove the shield and BKT.
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26’’ LCD TV Envision L26W761
4. Remove the main board, power board.
5. Remove the screws on the main frame.
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26’’ LCD TV Envision L26W761
6. Remove the speaker and key board to remove the bezel.
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26’’ LCD TV Envision L26W761
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26’’ LCD TV Envision L26W761
5. Repair Flow Chart
1. No Power (No LED indicator)
Check power cord and board interface
OK
NG
Plug in power cord and interface
Check F901, BD901, C907 NR901
OK
NG
Check, Q904 IC904
OK
Check D903, D917, IC902, Q902 ZD902
OK
Check Q901 IC901 D919 D901 D902
L906 R921
OK
NG
Check IC903，Q903
OK
Check D916，D913，D915，IC907
NG
Replace F901 BD901 C907 NR901
Replace Q904 IC904
NG
Replace D903, D917, IC902, Q902 ZD902
NG
Replace IC902，Q902
NG
Replace D916，D913，D915，IC907
Replace Q901 IC901 D919 D901 D902
L906 R921
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26’’ LCD TV Envision L26W761
2. Can not start (LED indicator yellow)
Check key board
OK
Check 5V SB
OK
Check PWR ON signal
OK
Check RELAY-SW signal
OK
Check main board power supply part
OK
Check U401
OK
Check I2C communication
NG
NG
NG
NG
NG
Repair the key board
Return to “1”
Check U905, Q906, 0907
Check I2C communication
Replace Q910, Q912
Replace U401
NG
Replace U905 or Q906 or Q907
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26’’ LCD TV Envision L26W761
3. Abnormal display
Check the source
OK
NG
Reset source
Check signal filter circuit
OK
OK
NG
TV signal Check TV system setup
NTSC, AV,
Component, PC signal
HDMI signal
Replace the filter or inductance
OK
Check TU1
Check U108
Check U107
Check U414, U415
NG
NG
Replace TU1
Replace U108
NG
NG
Replace U107
Replace U414, U415
Check U401
NG
Replace U401
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26’’ LCD TV Envision L26W761
p
A
4. No sound
Check the source
OK
NG
Reset source
Check signal filter circuit
Check Earphone jack
OK
Check U401
Check U601, U6A1
NG
NG
SIF signal Check TV system setu
V, Co mponent, PC signal
NG
Replace the filter or inductance
Replace the Earphone jack
OK
Check TU1
Replace U401
Replace U601 or U6A1
NG
Check U103
OK
Check U101
Replace TU1
Replace U103
Replace U101
OK
Check speaker
NG
Replace speaker
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26’’ LCD TV Envision L26W761
5. Key Board
OSD is unstable or not working
Is Key Pad Board connecting normally?
Y
Is Button Switch normally?
Y
Is Key Pad Board Normally?
Y
Check Main Board
N
Connect Key Pad Board
N
N
Replace Button Switch
Replace Key Pad Board
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