AOC L32W831 Schematic

32″LCD TV AOC L32W831

Service

31~60 kHz

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…….…………………….……….....9

2.4. Front Panel Control Knobs……………….……….....10

3. Input/Output Specification…………....................…....11

4. Mechanical Instructions…………………….................13

5. Repair Flow Chart ……………………….…….…….....17

6. PCB Layout ………………..………………....….......22

ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FA MILIARIZE HIMSELF WITH THE CHASSIS

Horizontal Frequency

TABLE OF CONTENTS

6.1.Main Board…………..……………...……….......22

6.2.Power Board……………..………….……….......25

6.3.Key Board………………………..……….......26

6.4.IR Board………………………..……….......26

7. White-Balance, Luminance Adjustment...................27

8. Block Diagram.……...........................................28

9. Schematic……………...…………..………………...29

9.1 Main Board…………………………………...….......29

9.2.Power Board…………….…………...………….......39

9.3.Key Board……………….……….………….......40

10. Exploded View………………………………….…...41

11. BOM List……………….…………………………….42

SAFETY NOTICE

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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32″LCD TV AOC L32W831

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 dam age th e equi pme nt. It is a lso i mportant to und ersta nd that thes e CAU TIONS a nd NOTI CES A RE 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. Tak e 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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32″LCD TV AOC L32W831

Revision List

Version Release Date Revision Instructions TPV Model

A00 Jul.-4-2008 Initial Release E328MNNSW8AENN

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32″LCD TV AOC L32W831

1. General Specification

Items Specification

Panel Type V315B1-L01 C2 NB CMO Driving system TFT-LCD CMO Panel Active Area ratio 16:9 Resolutions 1366 x768

LCD Panel

TV Function

Video Inputs

Brightness Contrast 1500:1 Pixel Pitch 0.51075 mm (H) X 0.51075 mm(V) Display colors 16.7 million Color Temperature Cool / Warm/normal TV Standard P AL M/N, NTSC Color systems PAL M/N, NTSC Closed Caption / V-chip For USA AVx2 RCA x 2 Audio L/R x 2 S-Video S-Video x 2 COMPONENT Y,Cb,Cr x 1 Audio channel L / Rx 1 HDMIx2 720p,1080i,480p,480i

500 cd/㎡

Audio Output Audio Output: L / R

OSD language English, etc Wall Mount VESA 200 mm x 200 mm

Power

Environment

Power Supply AC100V~240V, 50/60Hz Power Consumption < 200W Operating 0 °C ~ 40 °C Storage -10 °C ~ 50 °C Operating 10% ~ 85%

Speaker (built-in): Two 5W speakers Headphone Mini-jack for stereo (3.5ø) SPDIF

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32″LCD TV AOC L32W831

2. Operating Instructions

2.1 The Use of Remote Control

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32″LCD TV AOC L32W831

SETU

U

V

2.2 To Use the Menus

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 ENTER button to ena b l e/ d i s a bl e the function.

5. Press the MENU or EXIT button t o ex i t the men u.

Press the MENU button to enter the main OSD (On Screen Display). Adjust the items including Setup menu, Video menu, Audio menu and Feature menu. However, some function items in the menus may only be enabled in the particular source modes

The Setup menu in TV mode shows as below. In others source modes, the Setup menu only shows Menu

Language and Aspect Ratio items.

P MEN

1. PROGRAM NO: Show the TV channel label menu for user modifying channel labels specifically.

2. AIR/ CABLE: Select TV source signal from the Air (antenna) or Cable (CATV).

3. AUTO SEARCH: Automatically scan all NTSC 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. SKIP: you can select the ship ON/OFF,so that the program no channel can be delete or added.

IDEO MENU

The Video menu in most source mod es shows as bel ow. It provides several video adjust ment 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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32″LCD TV AOC L32W831

U

If you selected PERSONAL, press or to highlight an option, then press or to adjust the option. You can adjust:

1. CONTRAST: Video contrast adjustment, the tuning range is 0 ~ 100.

2. BRIGHTNESS: Video brightness adjustment, the tuning range is 0 ~ 100.

3.SATURATION: COLOR saturation adjust, the tuning range is 0 ~ 100

4. TINT: Video tint adjustment, the tuning range is R50 ~ G50.

5. SHARPNESS: Video sharpness adjustment, the tuning range is 0~10

6. BACKLIGHT: Backlight strength adjustment, the tuning range is 0 ~ 10.

7. EDGE ENHANCE: Press < or > to select HIGH, OFF, or LOW.

8.NOISE REDUCTION: Press < or > to select HIGH .OFF, LOW or MID.

9.COLOR TEMPERATURE: Press < or > to select COOL, STANDARD, or WARM.

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.

Press or to highlight AUDIO, then press > The AUDIO menu opens. Press or  to highlight PRESET, then press < or > to select an audio mode. You can select:

• VOICE

• MUSIC

• THEATER

• PERSONAL

If you selected PERSONAL, press or to highlight an option, then press  or to adjust the option. You can adjust:

• BALANCE—Adjust the balance between the right and left audio channels.

• BASS—Adjust the low sounds.

•TREBLE—Adjust the high sounds.

FEATURE MEN

The Feature menu in AV/S-video mode shows as below. It provides certain optional control functions such as image size, sleep time r, blue screen on/off, trans parent, closed caption, col or system. This menu gives us ers 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.

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32″LCD TV AOC L32W831

1. LANGUAGE: you can select the ENGLISH SPANISH Portuguese French

2. IMAGE SIZE : you can select WIDE, ZOOM, CINEMA, NORMAL

3. 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.)

4. BLUE SCREEN: you can select blue screen ON/OFF

5. TRANSPARENT: you can select from 0 to 7

6. CLOSED CAPTION：Press or to highlight CLOSED CAPTION, then press or to select the closed captioning mode. You can select CC1.CC2, CC3, CC4, TT1, TT2, TT3 or TT4.

7. COLOR SYSTEM: this function you select color system.default is auto you can choose NTSC, PAL M, PAL N.

8. RESET: you can use it reset all setting to default.

VGA SETTING MENU

VGA Set: This option only shows and is avail able in VGA mode, which pr ovides several it ems for the V GA display

as off / 5 min / 10 min

fine tuning, such as : 【H-Position】、【V-Position】、【Clock】and 【Phase】. All th ese items giving the tuning range

from 0 to 100.【Setting】item provides the default VGA setting values restoring.

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32″LCD TV AOC L32W831

2.3 How to Connect

1. HDMI – Connect the primary source for digital video such as a DVD multimedia player or set top box

through this all digital connector. The white color band on the rear of the TV indicates this connection.

2. VGA AUDIO– Connect the audio for a computer to this jack.

3. HEADPHONE – Connect headphone to this jack.

4. COMPONENT (YPb/CbPr/Cr with Audio L/R) – Connect the primary source for component video

devices such as a DVD Player or set top box here. From left to right, use red for Pr, blue for Pb, green for Y, red for right audio (R) and white for left audio (L) inputs.

5. AV OUT– Connect a VCR for recording to these jacks

6. S-VIDEO1 – Connect an S-Video device to this jack.

7. RGB PC – Connect the video and audio cables from a computer here.

8. AV1 IN – Connect the primary source for composite video devices, such as a VCR or video game.

9. Use the white and red connectors to connect the external audio from the same source. The signal

being carried by the S-Video cable and connector, if connected, will take priority over the Video RCA connector (yellow connector).

10. S-VIDEO2 – Connect an S-Video device to this jack.

11. Use the white and red connectors to connect the external audio from the same source. The signal

being carried by the S-Video cable and connector, if connected, will take priority over the Video RCA connector (yellow connector)

12. AV2 IN – Connect the primary source for composite video devices, such as a VCR or video game.

Once your equipment is connected, use the following procedure to view the input signal:

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32″LCD TV AOC L32W831

Press the source button on the remote controller to select the relevant source to view. (ex: Press VIDEO button to

select “Composite Rear” if you have connected a video recorder to Composite Rear socket.)

2.4 Front Panel Control Knobs

1 VOL▲

2 VOL▼

3 CH ▲

4 CH ▼

5 MENU

6 INPUT

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

to open or exit the OSD menu.

Source key: Press to select the input source.

Power key: Press to turn on / off (standby) the TV set.

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(Please re-turn on TV after the Power-ON status LED had changed to the Red color and finished flashing.)

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32″LCD TV AOC L32W831

3. Input/Output Specification

3.1 RGB Signal input

15 - Pin Color Display Signal Cable

Pin No. Description Pin No. Description

1 Red Video 9 No Pin 2 Green Video 10 Sync Ground 3 Blue Video 11 SDA(Remote Control) 4 SCL(Remote Control) 12 Serial Data for DDC 5 Ground 13 H-Sync. 6 Red Ground 14 V-Sync. 7 Green Ground 15 Serial Clock for DDC 8 Blue Ground

3.2 HDMI Digital connector pin assignments

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 Clock13 CEC 14 NC 15 SCL 16 SDA 17 DDC/CEC Ground 18 +5V Power 19 Hot Plug Detect

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32″LCD TV AOC L32W831

3.3 AV/S-Video/Component Video Inputs

AV (Composite Video input)

Video1/2

Amplitude 1.0 V (p-p), negative sync. Impedance 75 ohm terminated

S-Video (Y / C input)

S-Video1/2

System NTSC / PAL-M / PAL-N Y signal amplitude 1.0Vpp (including sync) C signal amplitude 0.286Vpp Impedance 75 ohm terminated

Component (Y, Pb/Cb, Pr/Cr input)

Video1

Y signal amplitude 1.0Vpp (including sync)

Impedance 75 ohm terminated

Cr, (R-Y) / Cb, (B-Y)

System NTSC / PAL-M / PAL-N

System 1080i, 480p, 720p, 480i

Signal amplitude

±0.35Vpp, 75 ohm

3.4 Compatible Mode Table

VESA MODES

Horizontal Vertical

Nominal

Pixel

Clock

(MHz)

Mode Resolution Total

640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175

VGA

SVGA

XGA

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 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322 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 46.875 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

Nominal

Frequency

(KHz)

Sync

Polarity

Nominal

Freq.

(Hz)

Sync

Polarity

1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750

WXGA 1360x768@60Hz 1792X795 47,712 P 60.015 P 85.5

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32″LCD TV AOC L32W831

4. Mechanical Instructions

1. Remove the 4 screws to remove the base.

2. Remove 9 screws to remove the rear cover.

3. Release the connectors

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32″LCD TV AOC L32W831

4. Remove 2 screws to remove the bkt-vesa-top.

5.Remove 2 screws to remove the speakers

6. Remove the main board, power board.

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32″LCD TV AOC L32W831

7. Remove the bkt-base-support..

7. Release the key board and IR board.

8. Remove the bkt-pcb-holder.

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32″LCD TV AOC L32W831

9. Remove the bkt-panel-support.

10. Remove the bezel.

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32″LCD TV AOC L32W831

5. Repair Flow Chart

1. No Power (No LED indicator)

Check power cord and board interface

OK

Check F901, BD901

OK

Check D902, C920

OK

Check T901

OK

Check D937, C952, C953,D932

NG

2. Can not start (No LED indicator)

Can not start

NG

Replace T901

NG

Replace F901 or BD901

Replace D902 or C920

Plug in power cord and interface

Replace D937 or C952 or C953 or D932

OK

Check key board or remote control

OK

Check power supply for main board

OK

Check U403

OK

Check I2C communication

NG

Replace U403

Repair key board or remote con t r ol

NG

Replace the failure component

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32″LCD TV AOC L32W831

3. No display (LED indicator Green )

Check back light is OK

OK

Check LVDS cable

and connector

OK

Check U403

OK

Check U401

NG

Check Panel

Replace U403

Replace U401

OK

Check 12V

power supply

OK

Check BL-ON/OFF signal

NG

Replace Panel

NG

Check PS

signal

NG

OK

Check power

board

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32″LCD TV AOC L32W831

4. Abnormal display

Check the source

OK

NG

Reset source

Check signal filter circuit

OK

Check U401

OK

Check panel

NG

TV signal Check TV system setup

AV/SV signal

PC signal

HDMI signal Check U507 Replace U507

NG

Replace the filter or inductance

OK

Check TU701

Check the circuit from connector to U401

Replace U401

Replace panel

NG

Replace TU701

NG

Replace the failure component

Replace the fa i lure component

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32″LCD TV AOC L32W831

p

5. No sound

Check the source

OK

Reset source

Check signal filter circuit

Check Earphone jack

OK

Check U603

Check U606

NG

SIF signal Check TV system setu

AV/SV/COMP ONENT/PC signal

HDMI signal

NG

Replace the filter or inductance

Replace the Earphone jack

NG

Replace U6 03

Replace U606

OK

Check TU701

Check U603

Check U507

NG

Replace TU701

Replace the failure component

NG

Replace U507

OK

Check speaker

NG

Replace speaker

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32″LCD TV AOC L32W831

6. 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

Replace Button Switch

Replace Key Pad Board

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