AOC E2051SDN Schematic

20" LCD Color Monitor AOC E2051SDN

Service

Horizontal Frequency

30-83 KHz

Table of Contents

Description Page Description Page

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

Revision List.…........................................…………........2

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

1.Monitor Specification..............................………..........4

5.Block Diagram…….........………….................24

6.Schematic……………........................................25

6.1.Main Board………...........................................25

6.2.Key Board...…….......................................... ...31

2.LCD Monitor Description……………………………......5

3.Operation Instruction…………...............……..............6

3.1.General Instructions...........................…........... ........6

3.2.Hot Keys…………….…..............……...............6

3.3.OSD Setting…………….…...........................…......7

4.Input/Output Specification............……………............19

4.1.Input Signal Connector............………….................19

4.2.Factory Preset Display Modes…….........................20

4.3.Panel Specification.....………...…………................21

7.PCB Layout..………….......................................32

7.1.Main Board………...........................................32

7.2.Key Board…………….....................................34

8.Maintainability……….........................................35

8.1.Equipments and Tools Requirement...............35

8.2.Trouble Shooting………….............................36

9.White-Balance, Luminance Adjustment.............40

10.Monitor Exploded View………..…….…............42

11.BOM List…………………………………...........44

SAFETY NOTICE ANY PERSON ATTEMPTING TO SERV ICE 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

Revision List

Version Release Date Revision History L&T Model Name

TABJT42EB7RMHNF.LF

A00 Jun-5-2012 Initial Release

TABJT42AB7PMHNF.LF

A01 JUL-08-2012 Increase new models

A02 AUG-03-2012 Increase new model TACJT42LB7GHHNF.LF

TACJT42EB7RMHNF.LF TACJT42CB7SPHNF.LF

Important Safety Notice

Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The servi ce procedures recommended by AOC and described in this service manual are effective methods of performin g 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 CAUTIO NS 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 mu st 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, specifie d safet y charact erist ics may create sho ck, 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 radiation 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 ground ed 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.)

1. Monitor Specifications

2. LCD Monitor Description

The LCD MONITOR will contain a main board and a key board which house the flat panel control logic, brightness control logic and DDC.

Monitor Block Diagram

LED Drive.

Flat Panel and LED backlight

Main Board

Key Board

Adapter

D-SUB

Signal

DVI

Signal

AC-IN

100V~24

3. Operating Instructions

3.1 General Instructions

Press the power button to turn the monitor on or off. The other control knobs are located at front panel of the monitor. By changing these settings, the picture can be adjusted to your personal preferences.

3.2 Hotkeys

Power

Press the Power button to turn on/off the monitor.

Menu/Enter

Press to display the OSD or confirm the selection

Eco (DCR)/-

Press the Eco key continuously to select the Eco mode of brightness and DCR on when there is no OSD. (Eco mode hot key may not be available in all models).

4:3 or Wide/+

When there is no OSD, press > continuously to change 4:3 or wide image ratio. (If the product screen size is 4:3 or input signal resolution is wide format, the hot key is disabled to adjust.)

Source/Auto / Exit

Auto / Exit

When the OSD is closed, press Auto/Source/Exit button continuously about 2 second to do auto configur e (only for the models with dual or more inputs). When the OSD is closed, press Auto/Source/Exit button will be Source hot key function (Only for the models with dual or more inputs).

3.3 OSD Setting

Basic and simple instruction on the control keys.

1) Press the MENU-button to activate the OSD window.

2) Press < or > to navigate through the functions. Once the desired function is highlighted, press the MENU-button to activate sub-menu . Once the desired function is highlighted, press it.

Press or to change the settings of the selected function. Press AUTO to exit. If you want to

adjust any other function, repeat steps 2-3.

4) OSD Lock Function: To lock the OSD, press and hold the MENU button while the monitor is off and then press the monitor is off and then press

Notes:

1) If the product has only one signal input, the item of "Input Select" is disable to adjust.

2) If the product screen size is 4:3 or input signal resolution is wide format, the item of "Image Ratio" is disable to adjust.

3) One of DCR, Color Boost, and Picture Boost functions is active, the other two function is turned off accordingly.

power button to turn the monitor on. To un-lock the OSD - press and hold the MENU button while

power button to turn the monitor on.

MENU-button to activate

Luminance

Press

(Menu) to display menu

Press or to select (Luminance), an d press to enter

Press or to select submenu, and press to enter.

Press or to adjust

Press to exit.

Image Setup

Press (Menu) to display menu

Press or to select (Image Setup) , and press to enter.

Press or to select submenu, and press to enter.

Press or to adjust.

Press to exit.

Color Setup

Clock 0-100 Adjust picture Clock to reduce Vertical-Line noise. Phase 0-100 Adjust Picture Phase to reduce Horizontal-Line noise Sharpness 0-100 Adjust picture sharpness H.Position 0-100 Adjust the horizontal position of the picture. V.Position 0-100 Adjust the vertical position of the picture.

Press (Menu) to display menu.

Press or to select (Color Setup), and press to enter.

Press or to select submenu, and press to enter.

Press

or to adjust.

Press to exit.

Warm Recall Warm Color Temperature from EEPROM. Normal Recall Normal Color Temperature from EEPROM. Cool Recall Cool Color Temperature from EEPROM.

Color setup.

DCB Mode

DCB Demo on or off Disable or Enable Demo

Picture Boost

sRGB Recall SRGB Color Temperature from EEPROM.

Red Red Gain from Digital-register

User

Green Green Gain Digital-register. Blue Blue Gain from Digital-register

Full

on or off Disable or Enable Full Enhance Mode

Enhance Nature Skin on or off Disable or Enable Nature Skin Mode Green Field on or off Disable or Enable Green Field Mode Sky-blue on or off Disable or Enable Sky-blue Mode AutoDetect on or off Disable or Enable AutoDetect Mode

Press (Menu) to display menu.

Press or to select (Picture Boost), and press to enter.

Press or to select submenu, and press to enter.

Press or to adjust.

Press to exit.

Frame Size 14-100 Adjust Frame Size Brightness 0-100 Adjust Frame Brightness Contras 0-100 Adjust Frame Contrast H. position 0-100 Adjust Frame horizontal Position V.position 0-100 Adjust Frame vertical Position Bright Frame on or off Disable or Enable Bright Frame

OSD Setup

Press (Menu) to display menu.

Press or to select (OSD Setup), and press to enter.

Press or to select submenu, and press to enter.

Press or to adjust.

Press to exit.

H.Position 0-100 Adjust the horizontal position of OSD V.Position 0-100 Adjust the vertical position of OSD Timeout 5-120 Adjust the OSD Timeout Transparence 0-100 Adjust the transparence of OSD Language Select the OSD language

Extra

Press (Menu) to display menu.

Press or to select (Extra), and press to enter.

Press or to select submenu, and press to enter.

Press or to adjust.

Press

to exit.

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