AOC L32W861 Schematic

32″LCD TV AOC L32W861

Service

Service

Service

Horizontal Frequency

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…….………….….....6

2.2.To Use The Menu…...………………….………......7

2.3.How To Connect…….……………….……….......13

2.4. Front Panel Control Knobs……………………....15

3.Input/Output Specification…………......................16

4.Mechanical Instructions……………………............18

5.Repair Flow Chart ………………………….…….....22

6.PCB Layout ………………..……………....……......29

SAFETY NOTICE

ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE

6.1.Main Board…………..…………….....……........29

6.2.Power Board…………….……………..………....32

6.3.Key Board………………………..………............37

6.4.IR Board………………………………..………….37

7.Adjustment..........................................................38

8.Block Diagram….……........................................40

9.Schematic……………...…………..……….….…...41

9.1.Main Board……….…………………….…….......41

9.2.Power Board…………….…………...…...…......68

9.3.Key Board……………….……….………..…......70

9.4.IR Board……………….……….………..….......71

10.Exploded View……….………………….…….….72

11.BOM List……………….………………..………...73

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

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32″LCD TV AOC L32W861

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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32″LCD TV AOC L32W861

Revision List

Version Release Date Revision Instructions TPV Model

A00 Jun.12, 2008 Initial Release E328MZNKW8AENN

A01 Sep.17, 2008 Add new model E328MZNSW8AENN

A02 Nov.28, 2008

A03 Mar.26,2009 Add new model

A04 Dec.01,2010

Add new schematic and layout for new power
board 715T2748 1 and add new BOM.

Lead in the new main power (715T2830 2)
Update item as below:

General Specification
Operating Instructions
Repair Flow Chart
PCB Layout
Schematic
BOM

E3284ZNKW8AENN

E328MZNKW8AENS

E329MZNSW8AENS

E328XZNKW8AENS

E329MZNKW8AE5N

E329MZNKW8AC5N

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32″LCD TV AOC L32W861

1. General Specification

For main P/N: 715T2763 2

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32″LCD TV AOC L32W861

For main P/N: 715T2830 2

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32″LCD TV AOC L32W861

2. Operating Instructions

2.1 The Use of Remote Control

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32″LCD TV AOC L32W861

SETU

2.2 To Use the Menus

1 Press the MENU button.

2 Press the ▽or △ button to select a menu item.

3 Press the < or > buttons to enter a sub-menu.
4 Press the ENTER button to enable/disable function.
5 Press MENU or EXIT to exit the menu.

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.

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.

P MENU

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 the channel (Viewable or Not Viewable by pressing Enter button). User won’t be able to view the
channel that has been set to Not Viewable when toggling through channels. However, the channels are still
accessible when user enters the channel number.

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 is on, user can edit favorite channel table in favorite
channel set option.

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32″LCD TV AOC L32W861

V

IDEO 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.

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.

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32″LCD TV AOC L32W861

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.

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 Digital 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. 【Time 】item provides user to set the time clock.

2. Sleep Timer: Enable or disable the TV standby timer. User can set the TV standby timer as off / 5 min / 10 min /
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.)

3. Advanced Video Menu: Provide the Noise Reduction、Color Temperature and 3D Y/C. Dynamic Contrast options

for enhancing video quality.

【Noise Reduction】gives four NR effect degrees, such as: Low, Mid, High and Off. The default setting is Mid.

【Colour Temp】gives three color temperature modes as: Normal、Warm and Cool.

【3D Y/C】provides On / Off switches. The default setting is On.

【 Dynamic Contrast】user can choose 0n or Off.

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32″LCD TV AOC L32W861

【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. Before entering the Parental Control
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 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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32″LCD TV AOC L32W861

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.

【Text Color】: Giving Red / Green / Blue/ Yellow / Magenta / Cyan / Black / White Colors.

【Text Opacity 】: 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.
【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-Position】, 【Clock】and【Phase】(Auto Adjust function is not supported

under Component mode). All these items are giving the tuning range from 0 to 100.【Setting】item provides the

default component setting 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-Position】、【Clock】, 【Phase】, and【Auto Adjust】.All these 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 L32W861

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32″LCD TV AOC L32W861

2.3 How to Connect

For main P/N: 715T2763 2

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

3. AV/S-VIDEO IN – Connect the primary source for composite video devices, such as a VCR or video game. 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).

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. DTV – Connect to an antenna or digital cable (out-of-the-wall, not from Cable Box) for Digital TV.*

6. SPDIF (Optical Digital Audio Out) - When a digital audio signal is associated with the input selected for viewing,
the digital audio will be available on this SPDIF connection to your home theater system.
Once your equipment is connected, use the following procedure to view the input signal:
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.)

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32″LCD TV AOC L32W861

For main P/N: 715T2830 2

Once your equipment is connected, use the following procedure to view the input signal:
Press the Source button or direct input buttons on the remote controller to select the relevant source to view. (ex:
Press Video button to select “Composite” if you have connected a video recorder to Composite socket.)

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32″LCD TV AOC L32W861

2.4 Front Panel Control Knobs

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32″LCD TV AOC L32W861

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 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

1

6

11 15

5

10

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

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 L32W861

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

Pixel

Clock

(MHz)

Mode Resolution Total

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

640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500

VGA

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

SVGA

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

XGA

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 L32W861

4. Mechanical Instructions

1. Remove the 3 screws to remove the base.

2. Remove 11 screws to remove the rear cover.

3. Remove 4 screws to remove the main frame.

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32″LCD TV AOC L32W861

4. Release the connectors.

5. Remove the speakers.

6. Remove the main board, power board

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32″LCD TV AOC L32W861

7. Remove the bkt-PCB-hplder.

8. Release the key board and IR board.

9. Remove the bkt-panel-support.

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32″LCD TV AOC L32W861

10. Remove the bezel.

11. Remove the 4 screws to release the panel.

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32″LCD TV AOC L32W861

p

5. Repair Flow Chart

1. No power

No power (LED “Off”)

Check the AC input and
the

ower is “ON”?

Yes

Power board output=5V?

Yes

Check the IR board and LED

No

Replace the IR board

No

Replace the main board

No

Power “On”

No

Replace the power board

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32″LCD TV AOC L32W861

2. Can’t start

Check the power key is under control?

Can’t start (LED Red)

Power board output＝12V?

Yes

No

Check the IR receiver is normal?

No

Replace the main board

No

Replace the Power board

No

Replace the power board

Yes

Replace the key board

Yes

Replace the IR board

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32″LCD TV AOC L32W861

3. Abnormal Display

Abnormal Display

No

Check the source

Yes

Enter factory mode to do

“EEPROM initial”&“Reset”

No

Reset the source

Check the main board

Yes

Check the LVDS cable

Yes

Check the panel

No

Replace the panel

No

Replace the main board

No

Replace the LVDS cable

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32″LCD TV AOC L32W861

4. No display

Check TV is under control and power
on/off by remote control and power key?

Yes

Check the LVDS cable

Yes

Panel Vcc =12V?

Yes

Replace the Panel

No display (LED Blue)

Yes

Check the backlight is

“On”?

No

Reinsert or replace the
LVDS cable

No

Replace the main board

No

Replace the main board

No

Check the B/L

signal is available?

Yes

Power board output＝12V?

Yes

Replace the Panel

Replace main board

Replace the power board

No

No

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32″LCD TV AOC L32W861

5. Sound problem

Check the speaker resistance value is in spec
(Remark: The value is marked on the speaker)?

No sound or sound abnormal

Check the audio source connection

and the TV system are correct？

Yes

Check the TV is muted, adjust the

volume or enter the menu to reset?

No

Enter factory mode to do “Reset”

No

Check the cable between the

speakers and main board is OK?

Yes

Yes

No

Reinsert the audio cable or
change the TV system

No

Replace the cable

No

Replace the main board

Replace the speaker

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32″LCD TV AOC L32W861

prop

6. Remote Control malfunction

Remote Control malfunction

Check the remote control battery is
not

erly placed or no power?

No

Use the other remote controls

No

Whether the IR board is

abnormal?

Yes

Replace the battery

Yes

Replace the remote control

Yes

Replace the IR board

No

Replace the main board

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32″LCD TV AOC L32W861

7. OSD is unstable or can’t work normally

OSD is unstable or can’t work normally

Key board connected properly?

Yes

Buttons are OK?

Yes

Key board is OK?

Yes

Enter factory mode to do “Reset”

No

Replace the main board

No

No

No

Reconnect the key board

Replace the button function

Replace the key board

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32″LCD TV AOC L32W861

6. PCB Layout

6.1 Main Board

715T2763 2

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32″LCD TV AOC L32W861

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