AOC L32W761 Diagram

26’’ LCD TV Envision L26W761

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

)

p

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

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

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

Replace TU1

Replace U108

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

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

Replace Button Switch

Replace Key Pad Board

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