AOC L19WB81, L22WB81, L26WB81, L32WB81 Schematic

18.5″&22″&26″&32″LCD TV AOC L19&22&26&32WB81

Service

Description

Table of Contents........……...................................…........1

Important Safety Notice.......................................……......2

Revision List………………………………………………....3

1. General Specifications...............................………........4

2. Operating Instructions…………………….……...….......6

Table of Contents

Page Description Page

6.1 Main Board………………..……………...…..…......31

6.2 Power Board…..…………..………….…..…….......34

6.3 Key Board………………………..……..……….......48

6.4 IR Board…………………………..……….…….......48

7.Adjustment................................................................49

2.1 The Use of Remote Control…….…………...…….......6

2.2 To Use the Menus...……………………….……….......7

2.3 How to Connect……..…………………….………......12

2.4 Front Panel Control Knobs……………….………......13

3.Input/Output Specification…………....................…....14

8.Block Diagram.……..................................................50

9.Schematic Diagram………..……..……….………......51

9.1 Main Board…………….…………………....….........51

9.2 Power Board………..…....…………...……….........66

9.3 Key Board……………….………….…………..........76

4.Mechanical Instructions…………………….................17

5.Repair Flow Chart ……………………….…….…….....26

6.PCB Layout ………………..………………....….........31

SAFETY NOTICE

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

9.4 IR Board…………..………………….………...........77

10.Exploded View…………………….………….….......79

11.BOM List……………….…………….……………......86

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

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.)

Revision List

Version Release Date Revision Instructions Customer Model AOC Model

L19WB81 E199M2NBW8G12N

A00 Oct.27,2009 Initial Release

A01 Nov.17,2009 Add new model

A02 Sep.2,2010 Add new power board

Add new model (power pcb:

A03 Nov.11,2009

715G3631P02000003S and 715G3418P01000003M)

L22WB81 E229G2NBW8G12N

L32WB81 E329G2NBW8G12N

E269G2NBW8G12N

L26WB81

E269A2NBW8G12N

L32WB81 E329A2NBW8G12N

L26WB81 E269A2NBW8G1NN

1. General Specifications

* This model complies with the specifications listed below. * Designs and specifications are subject to change without notice. * These models may not be compatible with features and/or specifications that may be added in the future.

2. Operating Instructions

2.1 The Use of Remote Control

POWER

Press to turn ON/OFF (standby) the TV.

SOURCE

Press repeatedly to choose the various input sources.

Number buttons

Press to enter TV channel number to select channel.

EPG

Press to display the Electronic Programme Guide.

PRE CH

Press to display the previous channel.

HDMI

Press to choose HDMI source mode.

YPbPr

Press to choose YPbPr source mode.

VIDEO

Press to choose AV source mode.

Press to choose PC source mode.

VOL+ / VOL

Press + or - to adjust the volume.

/ CH

Press channels.

Switch the sound ON/OFF.

ZOOM

Select the display aspect from Auto, Normal (4:3), Wide (16:9), subtitle, full screen, or 14:9 mode.

DUAL

Press to select from mono, stereo, Dual I, or Dual II.

AUDIO ADJ

Press to choose from Personal, Music, or Speech.

VIDEO ADJ

Press to choose the Smart Picture mode from Personal, Standard, Vivid, Movie, or Eco.

SLEEP

Press to set the preset time to switch the TV to standby mode automatically.

or to browse through the TV

MUTE

MENU/EXIT

Press to open or close menu.

▲, ▼, ◄, ►, OK

Press to adjust or confirm the various function items on the menu.

INFO

Press to display or close the information screen.

Colour buttons

In TV mode: Follow the directions in the OSD screen. In Text mode: Text control buttons.

TELETEXT

Press to display or close the Teletext.

MIX

Display the Teletext with TV.

SIZE

Press to change the font size: Full screen, Top half and Bottom half.

SUBPAGE

Display the sub page (when available).

INDEX

Press to return to page 100 or the index page.

SUBTITLE

In TV mode: It works only for turning on the subtitle and change to the next page marked as subtitle. In Text mode: Select the next page marked as a subtitle page and request it as the display page.

HOLD

Press to stop the scrolling of pages. The text decoder stops receiving data.

REVEAL

Reveal hidden information such as answers to a quiz.

FAV

Display the Favourite Channel List.

CH-LIST

Display the Channel List.

AD (Audio Description)

Select the audio description track.

FREEZE

Press to freeze the TV picture.

2.2 To Use the Menus

1. Press the MENU/EXIT button to display or close the main menu

2. Use the Navigation Ring to move around to select, adjust or confirm an item in the OSD (On Screen Display) menu. Press the MENU/EXIT button to enter the main OSD. Adjust the items including Picture, Sound, TV, Features, and Parental. However, some function items in the menus may only be enabled in the particular source modes.

Picture Menu

The Picture menu in most source modes shows as below. It provides several video adjustment items for user fine tuning the video display.

1. Smart Picture: To set the best picture appearance to a predefined picture setting from Standard, Vivid, Movie, Eco, or Personal.

2. Brightness: To brighten the dark parts of the picture.

3. Contrast: To sharpen the picture quality.

4. Colour: To add or reduce colour.

5. Tint: To adjust the picture tint.

6. Sharpness: To improve detail.

7. Colour Temperature: To choose between Normal (neutral), Warm (redder), and Cool (bluer).

8. Advanced Control: [Noise Reduction] - To filter out and reduces the image noise and improve picture quality. Select the effect degrees from Off, Low, Medium, High, or Auto.

[Flash Tone] - To adjust the skin colour to be more natural. [Back Light] - To make the background colour brighter or darker. [DCR] - Dynamic Contrast Ratio (DCR) auto adjusts the brightness of the screen to show more depths in the darker

areas. [HDMI Mode] - (HDMI only) User can select Auto/graphic/Video mode. Description as following:

• Auto: Automatic to get device information, device will indicate sending timing is video timing or graphic timing (PC timing).

• Graphic: Force video timing shows as graphic timing, for example: 720p shows 1280x720@60Hz; 1080i shows 1920x1080@60Hz. This mode optimizes for PC input.

• Video: Force graphic timing shows as video timing, for example: 1280x720@60Hz shows 720p; 1920x1080@60Hz shows 1080i. This mode optimizes for DVD player, camcorder, and other video appliances inputs.

Sound Menu

The Sound menu provides audio adjustment for user to modify the audio setting.

1. Sound Mode: To set the TV to a predefined sound setting from Personal, Music, or Speech.

2. Balance: To adjust the balance between left and right channels.

3. Virtual Surround: To add greater depth and dimension to the TV sound.

4. Digital Audio Out: To select the Digital Audio Out from Off or PCM.

5. SPDIF Delay: SPDIF Delay function will affect SCART/Line out audio also delay at that time. The NorDig HD IRD shall support the possibility to adjust the audio delay on the SPDIF output (if available) up to 250 ms and it should be adjustable in 10ms steps, as the IRD may have several different user set-ups, resulting in different a/v delays; e.g. the IRD may be connected to several types of external audioamplifiers and the STB may be connected to several types of external screens.

6. AVL: Choose On or Off to adjust volume to be consistent across programmes and channels automatically. The following functions are only available for digital channels with audio signals.

7. Type: This function enables you to choose the type of the additional narration during the TV watching from Normal, Hard of Hearing, or Audio Description. Hard of Hearing: This function provides narration to deaf and hard of hearing viewers.

8. Audio description: When the Type is set to “Audio Description”, you can adjust the volume of the audio description.

TV Menu

1. Country: To select the relevant country. This is the country you are in, or the country whose channels you want to receive if you live near its borders.

2. Audio Carrier (ATV only): Select Stereo, Dual 1, Dual 2, or Mono for ATV channel.

3. 1st and 2nd Audio: Use this function when two or more audio languages are broadcast. This is the language to be used for digital channels if it is available.

4. Channels: Enter the channels submenu, and choose from Channel Scan, Update Scan, Single RF Scan, Analog Manual Scan, Channel Skip, Channel Sort, Channel Edit, Decoder, and Analog CH Fine Tune. [Channel scan] - Channel Scan will retune the television automatically. It is recommended to run the Channel Scan periodically to ensure that all new services are added.

[Update scan] - Search the new channels automatically that are not in the channel list. [Single RF Scan (Digital Only)] - Enter the Single RF Scan in the Channels [Analog Manual Scan] - The television can be tuned-in manually using Analog Manual Scan. Use the number keys

to enter the Start Frequency to scan up or scan down. [Channel skip] - To prevent certain programs from being viewed by pressing CH + / - buttons on the remote control, the program position can be skipped. Tip: The skipped program may not be found by pressing CH + / - buttons but can be access by pressing number buttons directly.

Tip: The skipped program may not be found by pressing CH Λ / V but can be accessed by pressing number

buttons directly. [Channel sort] - Change the order of the Channel List. [Channel Edit] - Enter the Channel Edit in the channels submenu to edit the channel number and channel name by

using the number buttons 0~9. Note: The following RC number-mapping table will not be shown on the TV screen.

[Decoder (Analog only)] – Channel Decode support the Canal+ (paid television channel); however, the channel also broadcast some un-encrypted programs. These programs without encryption can be viewed free of charge. [Analog CH Fine Tune] - Select Analog CH Fine Tune in the Channels submenu to adjust the frequency.

Features Menu

The Features menu in TV mode shows as below. 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. Menu Language: To select the on-screen display menu language.

2. Picture Format: To select the available display format from Auto, Normal, Native (HDMI only), Zoom 1, Zoom2, or Wide.

3. Time:

[Time Zone] - To select the time zone you are in. [Time] - To set the time and date or select auto synchronization. Tip: Before you want to set the time and date by

your own, please make sure Auto synchronization is Off. [Sleep Timer] - To set the TV to turn itself off within a certain time.

4. Subtitle: [Analog Subtitle] - To display the transmitted subtitle on the screen. Either this text can be permanently displayed (assuming that the service is available in the broadcast) or only when mute is active. [Digital Subtitle] - Use the Digital Subtitle function when two or more subtitle languages are broadcasted. If subtitle data in a selected language is not broadcasted, the default language subtitle will be displayed. [Subtitle Type] - To choose the subtitle type from normal or hearing impaired.

5. Teletext Language:

[Digital Teletext Language] - To select the teletext language. [Decode Page Language] - To set the teletext language to the regional location.

6. Comon Interface: This menu appears with your CI supplier information.

7. HDMI Scan Info (HDMI only):

[Automatic] - Set to underscan or overscan automatically when the video signal is detected. [Underscan] - When the video signal is detected, all active pixels and lines are displayed with or without border. [Overscan] - When the video signal is detected, some active pixels and lines at the edges are not displayed.

8. Reset Default: To reset all TV settings to the original factory values.

Parental Menu

Enable you to control special functions for the TV channels.

1. Channel Block: To block certain TV channels.

2. Parental Guidance: To control access programs based on their age ratings. All settings apply to digital channels. Note: This function operates according to information from the broadcasting station. Therefore if the signal has no information, this function does not operate.

3. Input Block: To disable the specific external input signals.

4. Set Password: To set or change your password. Please follow the instructions to set it. All number combinations from 0000 to 9999 are valid. Tip: Remember that 5351 is the default Change Password code. If your access code has been changed or you have forgotten the code, you can always get in by inputting the default code.

5. Clear All: To clear all the settings in the parental submenu.

WARNING: Switch off your TV before any module is inserted into the Common Interface slot.

1. Correctly insert the CA Module and then the Smart Card into the CI slot located at the side of the TV.

2. Turn on the TV and press MENU and select the TV submenu. “Common interface” will be displayed if the CA module is detected. Wait for few moments until the card is activated.

2.3 How to Connect

18.5/22

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

Note: 18.5”/22” model only has one HDMI port.

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

3. AV 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.

4. COMPONENT (Y/Pb/Pr with Audio L/R) – Connect the primary source for component video devices such as a

DVD Player or set top box here.

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

6. SPDIF (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 theatre system.

7. SCART – Connect the video recorder or decoder to the television. Full SCART transmits RGB, CVBS video in/out,

and audio in/ out; half SCART transmits S-Video, CVBS video in/out, and audio in/out.

Note 1: 18.5”/22” model only has one HDMI port. Note 2: SCART1/2 has monitor out. (CVBS/YPbPr/ATV/DTV)

8. COMMON INTERFACE (CI) – Conditional Access Module (CAM) use only. Please contact your service provider

for details.

9. Earphone Output – Connect to the headphones. When the headphone is inserted to the plug, all the speakers

will be muted.

10.SERVICE – Technician service use only.

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 YPbPr button to select “YPbPr” if you have connected a video recorder to Component 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 Programme number.

4. CH ▼ CH ▼: Press to select the next lower Programme number.

5. MENU Menu key: Press to open or exit the OSD (on-screen display) menu.

6. INPUT Input key: Press to select the input source.

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

7. POWER

the power on status, LED had changed to the Green colour and stopped flashing.)

3. Input/Output Specification

3.1 Signal Connectors

VGA

Pin No. Description Pin No. Description

1 Red 9 +5V (Supply From PC) 2 Green 10 Sync GND 3 Blue 11 GND 4 GND 12 Bi-Directional Data(SDA) 5 Self Test 13 H. Sync 6 Red Ground 14 V. Syn c 7 Green Ground 15 Data Clock(SCL) 8 Blue Ground

HDMI

Pin No. Description Pin No. Description

1 TMDS Data2+ 11 TMDS Clock Shield

Full Scart

Pin No. Description Pin No. Description

2 TMDS Data2 shield 12 TMDS Clock3 TDMS Data2- 13 CEC 4 TMDS Data1+ 14 Reserved (N.C. on device)

5 TMDS Data1 shield 15 SCL 6 TMDS Data1- 16 SDA

7 TMDS Data0+ 17 DDC/CEC Ground 8 TMDS Data0 shield 18 +5V Power 9 TMDS Data0- 19 Hot Plug Detect

10 TMDS Clock+

1 Audio Output Right 12 N.C. 2 Audio Input Right 13 GND(Red) 3 Audio Output Left 14 GND(Blanking) 4 GND(Audio) 15 Red Input 5 GND(Blue) 16 RGB Switching Control 6 Audio Input Left 17 GND(Video Input & Output) 7 Blue Input 18 GND(RGB Switching Control) 8 Switch Signal Input (Fast Blanking) 19 Video Output(Composite)

9 GND(Green) 20 Video Input(Composite) 10 N.C. 11 Green Input

Common Ground

3.2 Video/Audio Signal

● TV RF input system - Aerial or cable should support PAL/SECAM/DVB-T

● TV RF input level - 10mV (80dBuV) typical, 30dBuV ~ 100dBuV receiving capability, terminated with input

impedance of 75Ω.

● CVBS input - 1000mVpp (including 300 mV sync level), terminated with input impedance of 75Ω.

● S-Video input - Y: 1000mVpp (include sync), C: 300mVpp terminated with Input Impedance of 75Ω.

● Component video input - Y: 1000mVpp (include sync), PbPr: 700mVpp terminated With Input impedance of 75Ω.

Support 480i/p, 576i/p, 720p, 1080i at 50Hz or 60Hz refresh rate.

● Audio input - Sensitivity 500mV (rms). For rated power, the amplifier should be able to handle input signal up to 2.0V, input impedance >10KΩ.

● SCART input / output - Full SCART, includes RGB in, CVBS (audio L/R) in/ (TV out). Half SCART includes S-Video in, CVBS (audio L/R) in/ (TV out).

● HDMI (High Definition Multimedia Interface)- Support 480i /480p, 576i/576p, 720p, 1080i format with HDCP

Digital interface with 4 channels TMDS signal

● CI Slot - PCMCIA card 5V input.

● PC VGA input - 700 mV input level, TTL level sync, RGB in, 75Ω impedance.

● PC Audio input - 500 mVrms input level, impedance > 10 kΩ.

● Headphone output - 4mW (Typ.) at 32Ω, impedance between 8 - 600Ω.

● SPDIF output - Level: +/- 0.5V Square Wave. SPDIF output sync SCART audio out. (For 18.5”&22”)

Level: 0.5V+/- 0.1V at 75, Square Wave. SPDIF output sync SCART audio out. (For 26”&32”)

● Amplifier output - 3 W+/-10% (For 18.5”&22”)

5 W+/-10% (For 26”&32”)

● Speaker - 8Ω

3.3 Video Input Format

Physical Inputs Format

PAL from RF 720 x 576 @50i

SECAM from RF 720 x 576 @50i

Side, SCART (CVBS,RGB and Y/C)

Component

720 x 576 @50i 720 x 480 @60i

720 x 480 @60i

720 x 480 @60p

720 x 576 @50i

720 x 576 @50p

1280 x 720 @60p

1280 x 720 @50p

1920 x 1080 @60i

1920 x 1080 @50i

HDMI

640 x 480 P 59.94/60Hz

720 x 480 P 59.94/60Hz

720 x 576 P 50Hz

1280 x 720 P 50Hz

1280 x 720 P 59.94/60Hz

1920 x 1080 I 59.94/60Hz

1920 x 1080 I 50Hz

720(1440) x 480 I 59.94/60Hz

720(1440) x 576 I 50Hz

640 x 480 @60Hz

800 x 600 @60Hz

1024 x 768 @60Hz

1360 x 768 @60Hz

720 x 400 @ 70Hz

4. Mechanical Instructions

L19WB81&L22WB81

1. Unscrew the 3 screws in red to remove STAND as Fig 1.

Fig 1

2. Unscrew the 7 screws in red to remove the REAR COVER and I/O as Fig 2.

Fig 2

3. Disconnect the 8 wires in green as Fig 3.

L19WB81

L22WB81

Fig 3

4. Unscrew the 15 screws to remove MAIN BOARD, POWER BOARD, KEY BOARD and BKT as Fig 4.

L19WB81

Fig 4

L22WB81

5. Unscrew the 2 screws to remove SIDE BKT as Fig 5.

Fig 4

Fig 5

6. Unscrew the 4 screws to remove MAIN FRAME as Fig 6.

L19WB81

Fig 6

L22WB81

7. The PANEL.

L19WB81

Fig 6

L22WB81

L26WB81

1. Unscrew the 3 screws in red to remove STAND as Fig 1.

Fig 1

2. Unscrew the 11 screws in red to remove REAR COVER and I/O COVER as Fig 2.

Fig 2

3. Disconnect all the WIRES and CONNECTORS in green as Fig 3.

Fig 3

4. Unscrew the 15 screws in red to remove MAIN/POWER BOARD and SHIELD-IO as Fig 4.

Fig 4

5. Unscrew the 12 screws in red to remove BKT-BASE-SUPPORT and PCB-HOLDER TOP&BOTTOM as Fig 5.

Fig 5

L32WB81

1. Unscrew the 4 screws in red to remove STAND as Fig 1.

Fig 1

Unscrew the 9 screws in red to remove REAR COVER and I/O as Fig 2.

Disconnect the 9 WIRES in green as Fig 3.

Fig 2

Fig 3

4. Unscrew the 15 screws in red to remove REAR COVER and I/O as Fig 4.

Fig 4

5. Unscrew the 2 screws in red to remove I/O BKT as Fig 5.

Fig 5

6. Unscrew the 12 screws in red to remove BKT as Fig 6.

Fig 6

7. The panel

5. Repair Flow Chart

No Picture (LED Orange)

Check main board standby power supply

Check key board/IR board

Check 16V (for 19”&22”); 24V (for 26”&32”) power supply

No picture

Check U400

Check I2C bus

Change key board/IR board

Check the power supply circuit

Check CN100

Change U400

Check I2C communication

Abnormal Display

No Sound

Check the source

Check signal filter circuit

Check LVDS cable

Check input

Check panel

Reset source

Replace the filter or resistance

RF signal

Replace LVDS cable

Replace panel

Check TV system setup

Check Tuner

Replace Tuner

Check the source

Check if mute

Check input signal

Check U400

Check U600

Check speaker

Reset source

TV SIF

Check TU501

Change U400

Change U600

Change speaker

Check TV

system

Change TU501

Reset TV system

No Power (No LED Indicator)

L19WB81&L22WB81

L26WB81&L32WB81

Check power cord and board interface

Check F901, BD901, C905

Check IC901, Q901, IC902, IC903

Check IC801, Q805, Q806

Check PT801, PT802

Plug in power cord and interface

Replace F901, BD901, C905

Replace IC901, Q901, IC902, IC903

Replace IC801, Q805, Q806

Replace PT801, PT802

Check power cord and board interface

Check F901, BD901, C905

Check F901, BD901, C910

Check IC901, IC902, IC950, IC951

Check IC801

Check T801

Replace IC801

Replace T801

Plug in power cord and interface

Replace F901, BD901, C910

Replace IC901, IC902, IC950, IC951

No Display (LED Indicator Green)

L19WB81&L22WB81

Check the source

Check LVDS cable

Check IC901, Q901

Check IC902, IC903

Check T901

Check U400

Check panel

L26WB81&L32WB81

Check the source

Reset source

Reset LVDS cable

Replace IC901 or Q901

Replace IC902 or IC903

Replace T901

Replace main board

Replace panel

Reset source

Check LVDS cable

Check IC901, IC902

Check IC950, IC951

Check T801

Check U400

Check panel

Reset LVDS cable

Replace IC901 or IC902

Replace IC950 or IC951

Replace T801

Replace main board

Replace panel

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

Replace Button Switch

Replace Key Pad Board

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