AOC L42W665 Service Manual

42″ LCD TV AOC L42W665

Service

31~60kHz

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 Menus...…………………….……….......6

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 ……………………….…….…….....23

6. PCB Layout ………………..………………....….......28

6.1.Main Board…………..………………….……….......28

6.2.Power Board……………..………….……….......30

SAFETY NOTICE

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

6.3.IR Board………………………………………….......33

6.4.Connector Board……………………..……….......34

6.5.Key Board……………………………….……….......34

7. White-Balance, Luminance Adjustment...................35

8 Block Diagram.……...........................................37

9. Schematic……………...…….……..………………..38

9.1 Main Board…….………..….…………….….......38

9.2. Power Board…………….……….………….......54

9.3. IR Board…………….……….………….…….......55

9.4. Key Board…………….……….………….......56

9.5. Side Board…………….……….……….…….......57

9.6. Audio Board…………………………………………58

10. Exploded View..…......................................59

11. BOM List……………….…………………………….60

12.Different Part List……….................................. 88

Horizontal Frequency

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

42″ LCD TV AOC L42W665

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.)

42″ LCD TV AOC L42W665

Revision List

Version Release Date Revision Instructions TPV Model

A00 July-10-07 Initial Release E427AZNS2WA2NN

A01 Aug-15-07 Add New BOM

E427AZNS2WA2NN/

E427AZNK2WA5NN

42″ LCD TV AOC L42W665

1. General Specification

Items Specification

Panel Type T420XW01 V500 TW AUO

Driving system TFT-LCD AUO Panel

Aspect Ratio 16: 9

Resolutions 1366 x768

Active Area 930.25 (H) x 523.01(V)

LCD Panel

Panel Typical Brightness:

Panel Typical Contrast：

Input

TV Function

Video Inputs

HDMI INPUT: Suggested scan rates: 1080i, 720p, 480p, 480i

OSD language English. French. Spanish

Wall Mount VESA 400 x 200 mm

Pixel Pitch 0.681 mm (H) X 0.681 mm(V)

Display colors 16.7 million

500 cd/㎡

1500:1

Color Temperature Cool / Warm/normal

H-Frequency 31KHz to 60KHz

V-Frequency 50Hz to 75 Hz

TV Standard NTSC/M

Color systems NTSC

AV RCA x 1 Audio L/R x 1

S-Video Y ,C x 1 Audio L/R x 1

COMPONENT Y, Pr/Cr, Pb/Cb x 1 Audio channel L / Rx 1

AUDIO Headphone Mini-jack for stereo (3.5ø)

Weight 24.5 kg

Dimensions

(Include Stand)

Power

Environment

Supplied Accessories:

NOTE: This TV set does not provide HD video Output.

1pcs Power cord, 1pcs Remote control(with two AA alkaline batteries), 1pcs User

Power Supply AC100V~240V, 50/60Hz

Power Consumption ≤250W

Operating Temperature + 0 °C ~ + 40 °C

Storage Temperature -10 °C ~ + 50 °C

Operating 10% ~ 85%

1050 mm(W) x 767 mm(H) x 290mm(L)

manual, 1pcs Signal cable, 1pcs Pc Audio cable

42″ LCD TV AOC L42W665

2. Operating Instructions

2.1. The Use of Remote Control

42″ LCD TV AOC L42W665

SETU

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 OK 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.

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. 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 or ATSC TV channel label menu for user modifying channel labels specifically.

7. Menu Language: Select the menu display language. (English /Spanish /French)

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.

42″ LCD TV AOC L42W665

IDEO MEN

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.

7. Settings: Restore the default video settings.

English

AUDIO MEN

The Audio menu in TV mode shows as below. It provides audio adjustment for user to modify the audio setting. Except in ATSC TV mode, some audio adjustment items for user to modify the audio setting. Excepting in ATSC TV mode, the Audio Language option is disable in others source modes. The audio language setting is only available in ATSC TV source. Furthermore, the Bass and Treble tuning items are only enabled while the SRS option set “Off” (tune-off the SRS sound effect). The Default states of Bass and Treble items are enabled as well as SRS option set “Off”.

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.

6. SRS: Choose to turn on / off the SRS sound effect. The default value is Off.

42″ LCD TV AOC L42W665

7. TV Speaker: Choose to turn on / off the TV internal speaker. The digital audio output signals、earphone output signals and the composite L/R audio output signals will not be turn-off even though the TV speaker is off. The default

setting is On.

8. Settings: Restore the default audio settings.

FEATURE MEN

The Feature menu in TV mode shows as below. It provides certain optional control functions such as time set, sleep timer, video noise reduction, parental control (V-chip) and close caption style 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 Zone and Time items. 【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 / 180 min / 240 min. 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 setting 、Color Temperature and 3D Y/C filter options for enhancing video quality.

【Noise Reduction】gives four NR effect degrees, such as: Low、Mid、High and Off. The default setting is off. 【3D Y/C】provides On / Off switches. The default setting is On. 【Color Temp】gives three color temperature modes as: Normal、Warm and Cool. The default mode is Warm. 【Setting】restores the default advanced video option settings.

42″ LCD TV AOC L42W665

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.)

42″ LCD TV AOC L42W665

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 Closed Caption: Provide numerous options for setting the 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.

42″ LCD TV AOC L42W665

【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, such as: 【H-Position】、【V-Position】and【Phase】. All these items are giving the tuning range from 0 to 100.【Setting】item provides the default component setting values restoring.

which provides fine tuning component display,

9. VGA Set: This option only shows and is available in VGA mode, which provides fine tuning VGA display, such as : 【H-Position】、【V-Position】、【Clock】and【Phase】. All these items are giving the tuning range from 0 to 100.【Setting】 item provides the default VGA setting values restoring.

Care of the screen

Do not rub or strike the screen with anything hard as this may scratch, mar, or damage the screen permanently. Unplug the power cord before cleaning the screen. Dust the TV by wiping the screen and the cabinet with a soft, clean cloth. If the screen requires additional cleaning, use a clean, damp cloth. Do not use liquid cleaners or aerosol cleaners.

Mobile telephone warning

To avoid disturbances in picture and sound, malfunctioning of your TV or even damage to the TV, keep away your mobile telephone from the TV.

End of life directives

We are paying a lot of attention to produce environmentally friendly in green focal areas. Your new receiver contains materials, which can be recycled and reused. At the end of its life specialized companies can dismantle the discarded receiver to concentrate the reusable materials and to minimize the amount of materials to be disposed of. Please ensure you dispose of your old receiver according to local regulations.

Regulatory Notices – Federal Communications Commission Notice

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

1.Reorient or relocate the receiving antenna.

42″ LCD TV AOC L42W665

2.Increase the separation between the equipment and the TV.

3.Connect the equipment into wall power outlet on a circuit different from that to which the receiver is connected.

4.Consult the dealer or an experienced radio or television technician for help.

Modifications –

The FCC requires the user to be notified that any changes or modifications made to this device that are not expressly approved by Norcent Technology Inc. may void the user’s authority to operate the equipment.

Cables –

Connections to this device must be made with shielded cables with metallic RF/EMI connector hoods to maintain compliance with FCC Rules and Regulations.

Canadian notice –

This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.

42″ LCD TV AOC L42W665

2.3 How to Connect

There are several ways to connect your TV. Please use the following chart to determine which connection is best for you.

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 “Video1 Composite Rear” if you have connected a DVD player to Video1 Composite socket.) "HDMI, the HDMI logo and High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC."

42″ LCD TV AOC L42W665

Note: The MUTE key on the remote control works on both TV internal speaker and the earphone output.

42’’ LCD TV AOC L42W665

2.4 Front Panel Control Knobs

42’’ LCD TV AOC L42W665

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

11 15

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 AV/S-Video/Component signal input

AV (Composite Video input)

Video1 / Video2

Amplitude 1.0 V(p-p), negative sync.

Impedance 75 ohm terminated

S-Video (Y / C input)

S-Video1 / S-Video2

System NTSC

Y signal amplitude 1.0Vpp (including sync)

C signal amplitude 0.286Vpp

Impedance 75 ohm terminated

System NTSC

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

Component1/Component2

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

Y signal amplitude 1.0Vpp (including sync)

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

Signal amplitude

±0.35Vpp, 75 ohm

Impedance 75 ohm terminated

Y = 0.299R + 0.587G + 0.114B

(R-Y)= 0.701R + 0.587G + 0.114B

(B-Y)=0.299R + 0.587G + 0.886B

42’’ LCD TV AOC L42W665

3.3 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

Nominal

Frequency

(KHz)

Sync

Polarity

Nominal

Freq.

(Hz)

Sync

Polarit

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 46.0875 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 78.750

42″ LCD TV AOC L42W665

4. Mechanical Instructions

1. Remove the base first with six screws in the base.

2. Remove the screws in red to remove the rear cover.

42″ LCD TV AOC L42W665

3. Remove the speaker cover and the cover-shield.

4. Remove the screws in red to remove the two metallic bracket and button assemble.

42″ LCD TV AOC L42W665

5. Remove the screws and pull out the connecters to remove the board.

42″ LCD TV AOC L42W665

6. Remove the screws and connectors in red to remove the bezel and speakers.

42″ LCD TV AOC L42W665

7. Remove the screws to remove the left and right metallic bracket.

42″ LCD TV AOC L42W665

5. Repair Flow Chart

1. No Power (No LED indicator)

NO POWER

Check power cord

Plug in power cord and interface

Check F901, BD901, D902

Check IC931, IC971,Q931 ，Q932 (VCC)

Check IC901，Q903，Q904

Check T931

Check D950, D951，ZD931

Check L931，L932

Replace F901 or BD901 or D902

Replace IC931, IC971, or Q931 or Q932 (VCC)

Replace IC901，Q903，Q904

Replace T931, T971

Replace D950, D951，ZD931

Check L931，L932

42″ LCD TV AOC L42W665

ace U

903，U

906，U

907，U908，U

909，U

2. Can not start (LED indicator yellow)

Check key board

Check the standby voltage of main board

Check U401

Check U404

Check I

Check the POWER_ON SIGNAL

C communication

Replace U401

Repair the key board

Replace U404

Check the components of I

Replace Q906，Q907，Q913

Repl

C communication

42’’ LCD TV AOC L42W665

3. Abnormal display

Check the source

Reset source

Check signal filter circuit

TV signal

NTSC, AV,

Component, PC signal

HDMI signal

Replace the filter or inductance

Check TV system setup

Check TU701

Check U701

Check U108

Check U414, U415, U914

Check U107

Replace U701

Replace U108

Replace TU701

Replace U107

Replace U414, U415, U914

Check U401

Replace U401

42’’ LCD TV AOC L42W665

4. No sound

Check the source

Reset source

Check signal filter circuit

Check Earphone jack

Check U401

Check U600

SIF signal Check TV system setu

V, Co mponent, PC signal

Replace the filter or inductance

Replace the Earphone jack

Check TU701

Check U701

Replace U401

Replace U600

Check U103

Check U101

Replace TU701

Replace U701

Replace U103

Replace U101

Check U1, U2, U3

Check speaker

Check U1, U2, U3

Replace speaker

42’’ LCD TV AOC L42W665

5. Key Board

OSD is unstable or not working

Is Key Pad Board connecting normally?

Is Button Switch normally?

Is Key Pad Board Normally?

Check Main Board

Connect Key Pad Board

Replace Button Switch

Replace Key Pad Board

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