AOC e2250Swn Schematic

21.5" LCD Monitor AOC e2250Swn

Service

Horizontal Frequency

30 - 83kHz

Table of Contents

Description Page Description Page

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.

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

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

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

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

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

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

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

3.2.Control Buttons and Connections...............................6

3.3.OSD Setting…..........................................................8

4.Input/Output pecification...............…..…………….......24

4.1.Input Signal Connector...............………..................24

4.2.Pres e t Displa y Modes …… ..........................25

4.3.Panel Specification…………..………………………..26

5.Block Diagram….........................................................28

5.1.Main Board…..….............................................28

5.2.Power Board…………..…………………………......29

6.Schematic…………..….........................................30

6.1.Main Board..…….…...........................................30

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

7.PCB Layout..………..............................................36

7.1.Main Board………..…........................................36

7.2.Power Board….…..............................................38

7.3.Key Board………..…..........................................39

8.Maintainability………............................................40

8.1.Equipments and Tools Requirement…...............40

8.2.Trouble Shooting…..………...............................41

9.White-Balance,Luminance Adjustment…............45

10.Monitor Exploded View……................................47

11.BOM List…………..……………………….............48

CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

Revision List

Version

Release Date

Revision History

TPV Model Name

A00

Dec.-28-2011

Initial release

TIBMRV2BDFA2NNE

TIBKRV2BDFA1NNE

A01

Feb.-20-2013

Add new models

TIA4RV2YAGACNNE

TIB1RV2QAGA1NNE

TIB2RV2BAGA1NNE

TIB2RV2BDFA1NNE

TIB2RV2YAGA1NNE

TIBKRV2BAGA7NNE

TIBKRV2QAGA12NE

TIC1RV2BAGA1NNE

TIC1RV2BAGA3NNE

TIC1RV2BAGA7NNE

TIC1RV2YAGA1NNE

TICARV2BAGA1NNE

TICARV2BAGA2NNE

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 may 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 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 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.)

1.Monitor Specifications

2.LCD Monitor Description

The LCD monitor will contain a main board, a power board and a key board which house the flat panel control logic, brightness control logic and DDC. The power part will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage.

AC-IN

100V-240V

Monitor Block Diagram

Flat Panel and LED backlight

Main Board

RS232 Connector For white balance adjustment in factory

LED Drive.

Video signal, DDC

HOST Computer

Key Board

Power board

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 (See Figure ). By changing these settings, the picture can be adjusted to your personal preferences. * The power cord should be connected. * Press the power button to turn on the monitor. The power indicator will light up.

3.2 Control Buttons and Connections

Power

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

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 disable to adjust. )

Auto / Exit When the OSD is closed,. Press Auto button continuously to do auto configure (Only for the models with dual or

more inputs).

1. Power

2. Analog (DB-15 VGA cable)

To protect equipment, always turn off the PC and LCD monitor before connecting. 1 Connect the power cable to the AC port on the back of the monitor. 2 Connect one end of the 15-pin D-Sub cable to the back of the monitor and connect the other end to the computer's D-Sub port. 3 Turn on your monitor and computer. If your monitor displays an image, installation is complete. If it does not display an image, please refer Troubleshooting.

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 it . press - or + to navigate through the sub-menu functions. Once the desired function is highlighted, press MENU-button to activate it.

3) 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 power button to turn the monitor on. To un-lock the OSD - press and hold the MENU button while the monitor is off and then press power button to turn the monitor on. 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.