AOC L32W831 Schematic

32″LCD TV

AOC L32W831

Service

Service

Service

									Horizontal Frequency
									31~60 kHz
		TABLE OF CONTENTS
Description		Page						Description	Page
Table Of Contents.......……..............................…........1								6.1.Main Board…………..……………...……….......22
Important Safety Notice.......................................……......2								6.2.Power Board……………..………….……….......25
Revision List…………………………………………………3								6.3.Key Board………………………..……….......26
1.	General Specification..............................………........4							6.4.IR Board………………………..……….......26
2.	Operating Instructions…………………….……….......5							7. White-Balance, Luminance Adjustment...................27
2.1. The Use Of Remote Control…….………….…….......5								8. Block Diagram.……...........................................28
2.2. To Use The Menu…...…………………….……….......6								9. Schematic……………...…………..………………...29
2.3. How To Connect…….…………………….……….....9								9.1 Main Board…………………………………...….......29
2.4. Front Panel Control Knobs……………….……….....10								9.2.Power Board…………….…………...………….......39
3.	Input/Output Specification…………....................…....11							9.3.Key Board……………….……….………….......40
4. Mechanical Instructions…………………….................13								10. Exploded View………………………………….…...41
5. Repair Flow Chart ……………………….…….…….....17								11. BOM List……………….…………………………….42
6.	PCB Layout ………………..………………....….......22

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

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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 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 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	Brightness	500 cd/
		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	PAL M/N, NTSC
	TV Function
		Color systems	PAL M/N, NTSC
		Closed Caption / V-chip For USA
		AVx2	RCA x 2	Audio L/R x 2
	Video Inputs	S-Video	S-Video x 2
		COMPONENT	Y,Cb,Cr x 1	Audio channel L / Rx 1
		HDMIx2	720p,1080i,480p,480i
			Speaker (built-in): Two 5W speakers
	Audio Output	Audio Output: L / R
			Headphone Mini-jack for stereo (3.5ø)
			SPDIF
	OSD language	English, etc
	Wall Mount	VESA 200 mm x 200 mm
	Power	Power Supply	AC100V~240V, 50/60Hz
		Power Consumption	< 200W
		Operating	0 °C ~ 40 °C
	Environment
		Storage	-10 °C ~ 50 °C
		Operating	10% ~ 85%

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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

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 enable/disable the function.

5.Press the MENU or EXIT button 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

SETUP 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.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.

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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32″LCD TV

AOC L32W831

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 MENU

The Feature menu in AV/S-video mode shows as below. It provides certain optional control functions such as image size, sleep timer, blue screen on/off, transparent, closed caption, color system. 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.

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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 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.)

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 available in VGA mode, which provides several items for the VGA display fine tuning, such as : H-Position V-Position 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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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▲	VOL +: Press to increase the sound volume level.
	2 VOL▼	VOL - : Press to decrease the sound volume level.
	3 CH ▲	CH +: Press to select the next higher Program
		number.
	4 CH ▼	CH - : Press to select the next lower Program
		number.
	5 MENU	Menu key: Press to open or exit the OSD menu.
	6 INPUT	Source key: Press to select the input source.
		Power key: Press to turn on / off (standby) the TV
		set.
	7	(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 Clock-
13	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

System

NTSC / PAL-M / PAL-N

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

System

1080i, 480p, 720p, 480i

Y signal amplitude

1.0Vpp

(including sync)

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

±0.35Vpp, 75 ohm

Signal amplitude

Impedance

75 ohm terminated

3.4 Compatible Mode Table

VESA MODES

Horizontal

Vertical

Nominal

Nominal

Nominal

Sync

Sync

Pixel

Mode

Resolution

Total

Frequency

Freq.

Polarity

Polarity

Clock

(KHz)

(Hz)

(MHz)

640x480@60Hz

800 x 525

31.469

N

59.940

N

25.175

VGA

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

SVGA

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

XGA

1024x768@70Hz

1328x806

56.476

N

70.069

N

75.000

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

		NG
	Check F901, BD901

	OK
		NG
	Check D902, C920
	OK

NG	Plug in power cord and interface

Replace F901 or BD901

Replace D902 or C920

		NG
	Check T901			Replace T901
	OK
				NG
Check D937, C952, C953,D932					Replace D937 or C952 or C953 or D932

2. Can not start (No LED indicator)

Can not start

OK

NG

Check key board or remote control

Repair key board or remote control

OK

NG

Check power supply for main board

Replace the failure component

OK

NG

Check U403

Replace U403

OK

Check I2C communication

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32″LCD TV

AOC L32W831

3. No display (LED indicator Green )

NG

NG

Check 12V

Check PS

Check back light is OK

power supply

signal

OK

OK

NG

Check LVDS cable

Check BL-ON/OFF signal

and connector

OK

NG

NG

Replace U403

NG

Check U403

Check Q705 Q704

OK

NG

Check U401

Replace U401

OK

NG

Check Panel

Replace Panel

18

	OK
		Check power
		board

Replace Q705 Q704

32″LCD TV

AOC L32W831

4. Abnormal display

Check the source

NG

Reset source

OK

NG

Check signal filter circuit

Replace the filter or inductance

TV signal

Check TV system setup

OK

NG

OK

Check TU701

Replace TU701

NG

Replace the failure

Check the circuit from

AV/SV signal

connector to U401

component

NG

Check the circuit from

Replace the failure

PC signal

connector to U401

component

NG

OK

HDMI signal

Check U507

Replace U507

NG

Check U401

Replace U401

OK

NG

Check panel

Replace panel

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32″LCD TV

AOC L32W831

5. No sound

Check the source

Reset source

OK

NG

Check signal filter circuit

Replace the filter or inductance

NG

Check Earphone jack

Replace the Earphone jack

SIF signal

Check TV system setup

OK

OK

NG

Check TU701

Replace TU701

AV/SV/COMP

NG

NG

Check U603

Replace the failure

ONENT/PC

signal

component

NG

Check U507

NG

Replace U507

HDMI signal

NG

Check U603

Replace U603

NG

Check U606

Replace U606

OK

NG

Check speaker

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?	N
			Connect Key Pad Board

	Y
	Is Button Switch normally?	N
			Replace Button Switch

	Y
			N
	Is Key Pad Board Normally?			Replace Key Pad Board
	Y
	Check Main Board

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