AOC TV3766W Schematic

37’’ LCD TV AOC TV3766W

Service

Service

Service

31.5-48.36 KHz

TABLE OF CONTENTS

Horizontal Frequency

Description Page Description Page

Table Of Contents.......…….............................…........1

Revision List……………………………………………....2

Important Safety Notice.......................................……......3

1. General Specification..............................………........4

2. Operating Instructions…………………….……….......5

2.1. The Use Of Remote Control…….………….…….......5

2.2. Front Panel Control Knobs……………….………....6

2.3. To Use The Menu…...…………………….……….......7

2.4. How To Connect…….…………………….……….....13

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

3.1.Input Signal Connector…………....……………….....16

7. PCB Layout …………..……………….....….......30

7.1. Main Board…………..………….………........30

7.2. Power Board…………..………….……….......33

7.3. Audio Board………………………………….....36

7.4.Tuner Board………………………..……….......37

7.5.Key Board…………………….…………........38

7.6.IR Board…………...……………….……….......38

8 Block Diagram…………………………………..39

9. Schematic……………………………………...40

9.1 Main Board………………………………........40

9.2. Power Board…………….……….…….……...51

3.2.Factory Preset Display Modes……………………….17

4. White-Balance, Luminance Adjustment......................18

5. Mechanical Instructions…………………….................22

6. Repair Flow Chart ……………………….…….…….....25

9.3. Tuner Board……………………….……........52

9.4. Audio Board…………………………….......56

10. Exploded View..……………............................57

11. BOM List……………….…………….………….59

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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37’’ LCD TV AOC TV3766W

Revision List

Version Release Date Revision History TPV Model

A00 Apr.-06-2006 Initial Release E376ATNCD1MRNP

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37’’ LCD TV AOC TV3766W

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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37’’ LCD TV AOC TV3766W

1. General Specification

Items Specification

Panel Type

Driver Element A-SI TFT active matrix

Aspect Ratio 16: 9

Resolution (Native) 1366 x 768 WXGA

Pixel Number 0.6 (H) x 0.6 (V) mm

Active Display Area H x V 819.6 (H) x 460.8 (V) mm

37” CMO T370XW01 V1
panel

LCD Panel

Frequency Range Horizontal: 31.5-48.36 KHz, Vertical: 60-75 Hz

TV System PAL B/G,D/K,I, NTSC M

Audio Output Audio Output: L / R Headphone Mini-jack for stereo (3.5ø)

OSD language
(default)

Table Stand Included

Wall Mount VESA 100 x 100 mm

Power

Pixel Pitch 0. 4365mm(H) x 0.4365mm(V)

Contrast Ratio 700:1 (type)

Brightness 450 nits (Typical)

Response Time 8ms

View Angle (CR≥10) H: 170/V: 170 (CR>10)

Display colors 16.7M colors (8-bits colors)

Lamp Type/Life 60000 hr (at 4.5mA)

Color Temperature Cool / Warm

English, Simplified Chinese

Power Supply AC100V~240V, 47-60 Hz ±3Hz

Normal: <220 W

Power Consumption

Operating Tem. + 0 °C ~ + 40 °C

Standby: < 7W
Suspend: < 7W
Power Off < 5W

Environment

Storage Tem.

Operating humidity 10% ~ 85%

Storage humidity 5% ~ 85%

4

-25°C to 60°C

37’’ LCD TV AOC TV3766W

2. Operations Instructions

2.1 The Use Of Remote Control

POWER

Press to turn on/off the TV.

Video/S-Video

Select your input source to
VIDEO or S-VIDEO.

COMP/T-LINE

Select your input source to
Component or HDMI(T-LINE).

VGA

Select your input source to
VGA.
(This type couldn’t support
DVI function.)

TV

Select your input source to
TV.

0~9/100 Digit buttons

To select a TV channel.

SLEEP

With this key you can set a
time period after which the TV
should switch itself to
standby. Press the key
repeatedly to select the
number of minutes. The
counter runs from
15,30,45,60,90,120 minutes.

PIP

Press to Open or Close
PIP&PAP.

VOL

Press + or - to adjust the

volume.

CH

Press + or - to change TV
channels number.

MENU

Press to open or exit main
menu

NICAM

When NICAM menu
activated,press the key
repeatedly to select
MONO/DUAL1/DUAL2
/DUAL 1+2/STEREO.

OK

Press the button to
confirm selection.

< > button

use this button to
confirm selection or
adjust the desired
parameter;
otherwise, to
increase/decrease
the volume.

DISPLAY

(1) Display Channel number

when use RF input.

(2) Display input source

when use other input
except TV RF input.

MUTE

Temporarily interrupt the
sound or restore it.

PRE-CH

To display the previously
selected TV channel.

WIDE

Includes 6 modes: Press
repeatedly to select
4:3 /14:9 / 16:9 ZOOM
16:9 ZOOM UP /

CINERAMA/ALL

SCREEN.

EFFECT

You can choice your prefer
mode of
NEWS/MOVIE/MUSIC/
BBE ViVA/CUSTOM/
STEREO.

SWAP

Press this key can select PIP
main source and sub source
exchange.

SOURCE

Press this button to display
selected source, press

∧∨button to select.
∧∨ button

When in menu mode, use this
button to select to the
up/down; otherwise, to
change TV channels.

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37’’ LCD TV AOC TV3766W

2.2 Front Panel Control Knobs

: Press this button to turn on the TV or allow the TV to enter standby mode. It is located on the lower right

corner of the TV.

If the TV is in standby mode, the indicator at the front will illuminate amber.

MENU : Press this button to display or exit the OSD menu.. .
CH(▲

VOL.(+-) : When the OSD menu appears, press these two buttons to confirm the selected item; when no OSD

SOURCE : Press this button to display selected source, press ▲

) : When the OSD menu appears, press these two buttons to elect the item you want to execute; when no

OSD menu appears, use to change channels in TV mode.

menu appears, use to adjust the volume.

button to select.

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37’’ LCD TV AOC TV3766W

2.3 OSD Operations

To use the menus

Press the Menu button to display or exit the Main Menu.

1.

2. Use the Up or Down buttons to select the function to be adjusted. The function where the cursor is located is the

selected one.

3. Use the Left or Right buttons to enter into the submenu, or to enable or adjust the selected function. The

function where the cursor is located is the one that can be adjusted.

4. Press the Menu button to exit the menu.

Adjust menu screen in TV/A V mode

(Note: In different modes, the functions that can be adjusted are different. A grey menu indicates that the

function cannot be adjusted.)

Press the MENU button to enter into the OSD MAIN MENU. Items adjustable include : VIDEO SETTING, SOUND SETTING, PIP
SETTING, OPTIONS SETTING, CHANNEL SETTING
VIDEO SETTING:

1. PICTURE: User can select PERSONAL、VIVID、STANDARD、MILD, if selected except PERSONAL item,
Contrast、brightness、Saturation、Sharpness、NR、Backlight can’t adjust .

2.CONTRAST: Adjust black and white level ,suitable contrast can make picture more lightly . adjustment range is

from 0 to 100.

3.BRIGHTNESS : Adjust background brightness , user can collocation it with contrast adjustment range is from 0 to

100.

4.SA TURATION: Adjust color saturation , range is from 0 to 100.

5. SHARPNESS: adjustment picture sharpness , range is from 0 to 100 .

6.TINT: When the TV uses the NTSC system, you can adjust to the TINT you prefer. The adjustment range is from

-50 to +50

7.NR: :

8.BACKLIGHT: The adjustment range of Black Level is from 0 to 10.

When the signal is poor, you can turn on the noise reduction function.

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37’’ LCD TV AOC TV3766W

You can adjust contrast、brightness、Saturation、Sharpness to your prefer level .

SOUND SETTING

1.VOLUME : The Volume adjustment range is from 0 to 100

You can adjust the Volume of the picture to the level you prefer.

2.EFFECT：You can choice your prefer mode of CUSTOM、STEREO、NEWS、MOVIE、 MUSIC、BBE ViVA; Default

is CUSTOM mode.

3.120Hz、500Hz、1500Hz、5KHz；10KHZ: Choice the prefer frequency to increase or decrease

PIP SETTING

DUAL MODE : Can select OFF、PIP、PAP status .

1.

2. POSITION: change small picture position.

3. SOURCE: choose video source from TV/AV1/AV2/S-video.

4. SOUND SELECT: choose sound source from MAIN/SUB.

OPTIONS SETTING:

1.MENU LANGUAGE: This indicates the different languages available for the OSD menu, including Simplified

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37’’ LCD TV AOC TV3766W

Chinese, English and traditional Chinese. The default is Traditional Chinese .

2.MENU TIMEOUT: OSD stay timer .

3.MENU BACKGROUND: User can select Opaque or transparency with Menu background.

4.SLEEP TIMER: Use this button to set a time period after which the TV will enter into stand by mode. The time

period can be 0>15>30>45 > 60 > 90 > 120 minutes.

The timer will begin to count down from the selected number of minutes after the OSD menu disappears.

Note: To check the remaining time, press the SLEEP button. To cancel the sleep timing, press the SLEEP button

repeatedly until 0 appears. If you turn off the TV after you set the sleep timing, the setting will be cleared. You will

need to set it again.

5. BLUE SCREEN : When there is no signal input in TV, AV, S-Video and HDTV modes, the screen will become blue.

If set to On, the screen will become blue. If set to Off, the screen will display a snowy picture when in TV signal

mode and become black in other signal modes. The default is On.

5. RESET : Used to resume the TV’s default settings.

CHANNEL SETTING

1. COLOR SYSTEM: Auto select TV broadcast system , AUTO/NTSC/PAL.

Note: when user finish auto search , user can change system .

2. SOUND SYSTEM: Select the sound system for a TV broadcast system.BG system shall be selected for most

areas of Indonesia.

3. AUTO SEARCH: Used to scan all the TV channels and save to memory.

The TV’s total number of channels is 125 (1-125). If you use the remote control to select a number out of the range

of 1-125, it will automatically skip to the channel number you previously watched.

4. MANUAL SEARCH: Used to scan the TV channels one at a time. When you scan a channel and press MENU,

the last channel will be automatically saved.

5.FINE TUNE: Fine-tunes the frequency of a channel to obtain better image quality.

6. CHANNEL SWAP : Swap current channel with others.

7. CHANNEL SKIP : If set to “On”, this channel will be shielded. When you press the Channel Up/Down buttons,

you cannot enter this channel. But when you press the digit buttons, you can enter it. To regain full access this

channel, set this item to Off.

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37’’ LCD TV AOC TV3766W

Adjust menu screen in VGA mode:

The TV has a VGA analog interface, which can be switched using the VGA button on the remote control.

Press the MENU button to enter into the OSD Main Menu. Adjustable items include: VIDEO SETTING 、SOUND

SETTING 、OPTIONS SETTING、VGA SETTING .

VIDEO SETTING

1. PICTURE: Can’t adjust in VGA mode .

2.CONTRAST: Adjust black and white level ,suitable contrast can make picture more lightly. adjustment range is

from 0 to 100.

3.BRIGHTNESS : Adjust background brightness, user can collocation it with contrast adjustment range is from 0

to 100.

4.SA TURATION: Can’t adjust in VGA mode.

5. SHARPNESS : Can’t adjust in VGA mode.

6.TINT: Can’t adjust in VGA mode.

7.NR: Can’t adjust in VGA mode.

8.BACKLIGHT: Can’t adjust in VGA mode.

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37’’ LCD TV AOC TV3766W

OPTIONS SETTING:

1.MENU LANGUAGE: This indicates the different languages available for the OSD menu, including Simplified

Chinese, English and traditional Chinese. The default is English.

2.MENU TIMEOUT:OSD stay timer.

3.MENU BACKGROUND: User can select Opaque or transparency with Menu background.

4.SLEEP TIMER: Can’t adjust in VGA mode.

5. BLUE SCREEN : Can’t adjust in VGA mode.

6.RESET : Used to resume the TV’s default settings.

VGA SETTING

1. H.POSITION: change horizontal position on screen .

2. V.POSITION : change vertical position on screen.

3. CLOCK: change picture horizontal width.

4. FOCUS : Adjust ADC(Analog Digital Converter) focus.

5. AUTO ADJUST: To make optimal video image.

6. COLOR TEMP.: Select video color temperature mode, total 3 mode: Warm、Cool、Personal.

7. PERSONAL: When “color temp” is under “Personal” , Can edit RGB value.

8. RESET :Recall to default.

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37’’ LCD TV AOC TV3766W

Tips

Screen Protection

To avoid permanent damage to the screen, do not use anything abrasive to scratch the display.
Unplug the appliance before you clean the screen. Use a clean, soft cloth to wipe the screen and the enclosure to
remove the dust from the TV. If you want the screen to be cleaner, you can use a clean, wet cloth to wipe. A cleanser
especially designed for LCD screens is recommended. Do not use liquid or spray cleaner.

Warning for Mobile Phones

Since the electromagnetic wave of mobile phones may cause the picture and the sound to become distorted, please
keep away from the TV when using a mobile phone.

Waste Disposal Instructions

We pay great attention to environmental protection. This appliance contains reusable materials.
After you discard the appliance, professional companies can dismantle the discarded appliance to extract any
recyclable materials and minimize the amount of material that has to be disposed of.
Be sure to dispose of the old appliance according to the local regulations.

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37’’ LCD TV AOC TV3766W

2.4 How To Connect

2.4.1 Power Connection

Plug one end of the power cord to the “AC POWER IN” jack in the rear of the TV, and the other end to the 220V

power socket.

If you have not turned off the power and leave TV in standby mode, the TV will continue to consume a residual

amount of power.

When unused for long periods of time, it is best to turn off the power switch on the side of the TV and unplug the

power cord from the socket.

(Figure 1)

2.4.2 Signal source interface presentation from rear view :

You can connect numerous items of source equipment to your TV. The figure below shows you how to connect

these.

Place the TV on a table with the LCD screen facing down to facilitate easy connection with the external equipment.

Please take precautionary measures to avoid damaging the LCD screen.

(Figure 2)

1. VGA Signal Input : Display PC host video signal.

2. PC AUDIO Input: Receive sound signal from PC host.

(Figure 3)

2.4.3 How to connect to the PC host.

VGA interface – Connect the one terminal of VGA signal cable to the VGA interface at the rear of the TV ,The other

terminal connect to PC host.

as in Figure.

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37’’ LCD TV AOC TV3766W

2.4.4 HDMI input

HDMI is the leading new standard for Digital video and audio interconnection. To the HDMI

connector you can connect HDMI devices such as a Set Top Box or compatible DVD-R or

DVD player with HDMI export. So you can display high-definition pictures on this TV in the

digital form.

How to use HDMI:

1. Connect the HDMI cable to the “HDMI” port of this TV, and the other port to the device’s

interface with HDMI export. (as top-left figure).

2. Select the HDMI button in the Remote control

(see bottom-left figure)

3. The HDMI connectors allow the following TV and monitor display mod:

SDTV 720x480i 60Hz/720 x576i 50Hz

EDTV 720x480p 60Hz/ 720x576p 50Hz

HDTV 1920x1080i 50/60Hz

1280x720p 50/60Hz

VGA 640x480 60Hz

Notes:

1.Your TV supports HDCP(High-bandwidth Digital Content Protection).This Is a system for protecting DVD content.

It provides a secure digital link between a video source (DVD,PC,etc.) and your TV. Content is encrypted at the

source device to prevent unauthorized copies from being made.

2.Digital devices from different manufacturers have the possibility of differing output standards which may cause

difficulties for the television to properly display.

3.In case no signal is detected from your HDMI device, turn off the HDMI device and then on again.

4.To get an optimal viewing ,it is advised to turn your DVD player to one of the following TV display

standards:1280x720p 50hz

2.4.5 Connect the audio cable

Connect the PC audio cable supplied with the TV to the TV’s PC Audio Input as in Figure 1.

Note: If no signal is present on the VGA , the TV will enter into standby mode automatically after 1 minute.

1. Analog (Antenna) Input: Connect the antenna or CATV cable to this 75Ω coaxial cable input .

Note: When no TV signal input, TV set will enter standby status automatically within 10minutes.

2. Audio/Video (AV) Input :

Audio 1 Input: Connect the audio signal source (PC, DVD player, Laser Disc player, videocassette recorder or

camcorder) to the Audio Input ports (left and right).

Video 1 Input: Connect the video signal source (PC, DVD player, Laser Disc player, videocassette recorder or

camcorder) to the Video 1 Input interface.

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37’’ LCD TV AOC TV3766W

Audio 2 Input: Connect the audio signal source (PC, DVD player, Laser Disc player, videocassette recorder or

camcorder) to the Audio Input ports (left and right).

Video 2 Input: Connect the video signal source (PC, DVD player, Laser Disc player, videocassette recorder or

camcorder) to the Video 2 Input interface.

3. S-Video Input:

Connect the S-Video cable to DVD player, Laser Disc player, videocassette recorder or camcorder (Note: For

S-Video, Audio and Video 2 are shared).

4.

Component signal Y, Pb/Cb, Pr /Cr Input or HDTV Input:

Connect the component signal source of audio and video (DVD player, Laser Disc player, videocassette recorder

or camcorder) to the Component Input port.

2.4.5 Connect signal cables:

1.User three component signal cables to Connect the high definition signal Y、Pb、Pr or the component signal Y、
Cb、Cr the DVD player outputs to the high definition signal Y、Pb、Pr input of the TV.

2. Use the audio cable to connect the audio output of the DVD player to the TV’s Component Input.

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37’’ LCD TV AOC TV3766W

3. Input/Output Specification

3.1 Input Signal connector

This procedure gives you instructions for installing and using the LCD TV display.
Lay the display on the desired operation and plug the power cord into a convenient AC outlet. Three-wire power cord
must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical
conduct ground. If the AC outlet in your location does not have provisions for the grounded type plug, the installer
should attach the proper adapter to ensure a safe ground potential.

Connect the 15-pin D-SUB color display shielded signal cable to your signal system device and lock both screws on
the connector to ensure firm grounding. The connector information is as follow:

1

6

11 15

5

10

15 - Pin Color Display Signal Cable

Pin No. Description

1 Red Video

2 Green Video

3 Blue Video

4 Not Used

5 GROUND

6 Red Video Ground

7 Green Video Ground

8 Blue Video Ground

9 Mandatory +5V Supply for PC Bypass

10 Sync. Ground

11 Not Used

12 Serial Data for DDC

13 Horizontal Sync.

14 Vertical Sync.

15 Data Clock for DDC

Apply power to the display by turning the power switch to the "ON" position and allow about ten seconds for Panel
warm-up. The Power-On indicator lights "Green" when the display is on.

With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness and
contrast to the most pleasing display, or press auto-adjust to get the best picture-quality.

This TV (with PC function) has power saving function following the VESA DPMS. Be sure to connect the signal
cable to the PC.

If your TV requires service, it must be returned with the power cord.

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37’’ LCD TV AOC TV3766W

3.2 Factory Preset Display Modes:

Vertical

Dots × Lines

720 × 400 70.1 31.5 NEG POS YES YES YES NO
640 × 480

800 x 600

1024 x 768 60.0 48.36 NEG NEG YES YES YES NO
1360 x 768 60.0 47.36 POS NEG YES YES NO YES

Frequency

(Hz)

59.9 31.5 NEG NEG YES YES YES NO

75.0 37.5 NEG NEG YES YES YES NO

60.0 37.9 POS POS YES YES YES NO

75.0 46.87 POS POS YES YES YES NO

Horizontal

Frequency

(kHz)

Sync Polarity Presence Screen Mode

Horizontal Vertical Horizontal Vertical

Normal

(4:3)

FULL
(16:9)

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37’’ LCD TV AOC TV3766W

4. White Balance, Luminance Adjustment

Instrument List:

Chroma 2225、VG848、Chroma 7120

Adjustment Process:

① Instrument Orientation

Connect LCD-TV、Chroma 2225 and VG848, and set Timing137、Pattern1 on Chroma2225. Chroma7120’s lens

must aim at the center of Pattern1 showed on the LCD-TV’s screen. The distance of Chroma7120’s lens and the

center of screen is 20cm±1cm.

② ENTER FACTORY

After orientation OK, set Pattern104(black picture) on Chroma225.Press 1-9-9-9 on remote to enter the menu

on top left of the screen(refer to fig.1,this menu will show slowly), then from UP key(△) option to enter the menu

(refer to fig.2).

Fig.1

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37’’ LCD TV AOC TV3766W

Fig.2

Fig.3

③ PC Mode White Balance Adjustment

Begin to adjust the W/B (White Balance) you should select the Color Temp(Warm and Cold) and enter the son

menu from father menu “Scaler” refer to Fig.2 and Fig.3.

Set channel color temperature value and brightness on Chroma7120.Set 303 319 350(warm Temp) on CH3 and

278 289 350(cold Temp) on CH4.Press MODE key on Chroma7120 to switch xyY mode.

Use black sleeve on Chroma7120’s lens to ensure no external ray. Set Pattern104 on Chroma2225.Adjust

SCALAR RB、GB、BB value to make sure the brightness is the lowest, then set Pattern105 on Chroma2225 and

adjust RG、GG、BG value to make the value displaying on Chroma7120 is about 100.Press “Save” to save. Switch

to CH4, select cold Temp and then adjust it according to above method. Press “Save” to save.

④ AV MODE W/B ADJUSTMENT

Begin to adjust AV/COMPONENT YPbPr(480I/576I)/COMPONENT T-scaler(480P/720P/1080I) /HDMI W/B,

their Color Temp modes refer to Fig.4/5/6/7

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37’’ LCD TV AOC TV3766W

Fig.4

Fig.5

Fig.6

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37’’ LCD TV AOC TV3766W

Fig.7

1.OFFSET(26%) W/B ADJUSTMENT(This is only for AV/TV)：Change the input signal to 26% white level

performance .Set the CHROMA7120 to 288 301 30 and MODE_RGB ,then adjust the TV’s RB、GB、BB to make

CHROMA7120 display to 100.

2.W/B ADJUSTMENT (100%): Change the input signal to 100% white level performance. Set the

CHROMA7120 to 288 301 415 and MODE_RGB , then adjust the TV’s RG、GG、BG to make CHROMA7120 display

to 100.

3.Save the adjustment. Then change the input signal to 26% white level performance. Set the CHROMA7120 to

MODE_RGB and CH3, check whether the color temperature was in SPEC (color spec is x±15;y±15;Y±15). In this

time, most of the TV is in SPEC, while the others should be adjusted twice or more to make its color temperature in

SPEC.

4.CHECK CUT OFF: Change the input signal to 0% white level performance. Firstly, press the “brightness” from

50% to 0% and make sure the Y is not changed. Secondly, change the input signal to 32 GRAYS performance and

make sure the grays is not connected at any position.( as the 5% level is between the first gray and the second gray.

5%=（1/32）*1.6。)

1.The white color temperature in PC Mode should be app.7200K(CIE1931: x=0.303, y=0.319，Y>350),

10300K(CIE1931 : x= 0.278, y= 0.289, Y>350 ).

2.The white color temperature in AV/TV Mode should be app. 8700K(CIE1931:x=0.288±15, Y=0.301±15,

Y>370). In this Mode,we should check the black balance,which level is 26% of the white level(1.0Vpp).

3. The white color temperature in HDTV/HDMI Mode should be app. 8700K(CIE1931:x=0.288±15, Y=0.301±15,

Y>370)

Those three channels should be factory preset and not be possible to be modified.

The measurement position is the center of the display(5) at brightness set to center and

Contrast set to max. . The tolerance of the color coordinates should be less than ± 0.015

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37’’ LCD TV AOC TV3766W

5. Mechanical Instructions

Step Figure Description

Lay the

Preparation

LCD-TV on a
flat, soft and

clean surface.

Remove

the back

cover

Remove the
fourteen
screws to
remove the
back cover.

Remove
the shield
and stand

Remove the
17 screws to
remove the
shield and
stand

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37’’ LCD TV AOC TV3766W

Remove
the shield

Remove
the main
board &
power
board

Remove the
10 screws to
remove the
shield.

Remove the
12 screws and
8 interfaces.

Remove
the key pad

Remove the
main frame

Remove the
two screws to
remove the
key pad.

Remove the
16 screws to
remove the
main frame.

23

37’’ LCD TV AOC TV3766W

Remove the

Remove
the bezel

10 screws to
remove the
bezel.

The panel

24

37’’ LCD TV AOC TV3766W

6. Repair Flow Chart

6.1 Can not start (LED indicator yellow)

No LED Indicate Check power cord and board

OK

Check key board

OK

Check 5V_SB

OK

Check 3.3V_SB

OK

Check PWR_ON Signal

OK

Check main board power supply

NG

NG

NG

Check U702

Repair the keyboard

Check power board power supply

Check Q704, Q705, Q706, Q709

Check U402, U401

Check I2C communication

25

37’’ LCD TV AOC TV3766W

6.2 No Display (LED indicator green)

Check signal source

OK

Check LVDS cable

OK

NG

Reset the source

NG

Replace or reset LVDS cable

Check inverter board 24V power supply

OK

Check main board power supply

OK

Check U302

OK

Check I2C communication

OK

Check panel

NG

NG

NG

Replace U302

Check power board power

Replace panel

26

37’’ LCD TV AOC TV3766W

6.3 Abnormal Display

Check the source

OK

NG

Reset source

Check signal filter circuit

OK

OK

Check U301

OK

Check U302

OK

NG

RF signal Check TV system setup

AV signal

PC signal

HDMI, DVI signal

NG

NG

Replace the filter capacitance or inductance

OK

Check TU100

Check U104

Check U102

Check U411

Replace U301

Replace U302

NG

NG

NG

NG

Replace TU100

Replace U104

Replace U102

Replace U411

Check U501

OK

Check panel

NG

NG

Replace U501

Replace panel

27