AOC E940, E943 Schematic

18.5" LCD Color Monitor AOC e940Swa

Service

Horizontal Frequency

30-80 kHz

TABLE OF CONTENTS

Description Page Description Page

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

Description

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

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

1. Monitor Specification.................................………........3

2. LCD Monitor Description…………………………….......6

2.LCD Monitor Description…………………………….......4

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

3. Operation Instruction…………...................…...........5

3.1 General Instructions.....................................…...........7

3.1 General Instructions.....................................…...........5

3.2 Control Button……………………………..……...........7

3.2 Control Button……………………………..……...........5

3.3 Adjusting the Picture...........................…............7

3.3 Adjusting the Picture...........................…............5

4. Input/Output Specification............……………............11

4. Input/Output Specification............……………............8

4.1 Input Signal Connector............…..……................11

4.1 Input Signal Connector............…..……................8

4.2 Factory Preset Display Modes...........................12

4.2 Factory Preset Display Modes.........................9

5 Panel Specification.....…………………........................13

5 Panel Specification.....…………………........................10

5.1 Display Characteristics………………………………13

5.1 Display Characteristics………………………………10

5.2 Optical Characteristics……………………………….14

5.2 Optical Characteristics………………………………..10

5.3 Electrical Characteristics……………….…………..15

5.3 Parameter guide line for CCFL Inverter……………..10

6. Block Diagram…….…................………….........17

Page

6.1 Software Flow Chart…….…..........………….........17

6.2 Electrical Block Diagram………...………...…......19

7. Schematic……………………………………………. 21

7.1 Main Board…………..............................................21

7.2 Power Board....……………....................................26

8. PCB Layout..…………............................................27

8.1 Main Board……………......................................27

8.2 Power Board….....................................................28

8.3 Key Board……………….....................................29

9. Maintainability………...............................................30

9.1. Equipments and Tools Requirement.....................30

9.2. Trouble Shooting…………....................................31

10. White-Balance, Luminance adjustment.................36

11. Monitor Exploded View……..……………............38

12. BOM List....……....................................................39

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

18.5" LCD Color Monitor AOC e940Swa

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.)

18.5" LCD Color Monitor AOC e940Swa

Revision List

Version Date Revision History Remark

A00 May.-20-2010 Initial release T89ANRNQWWA26NE

18.5" LCD Color Monitor AOC e940Swa

1. Monitor Specification

18.5" LCD Color Monitor AOC e940Swa

2. LCD Monitor Description

The LCD MONITOR will contain a main board, a power board, an audio board and a key board which house the flat

panel control logic, brightness control logic and DDC.

The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips

each voltage.

PWPC board (Include: adapter, inverter)

AC-IN 100V-240V

Monitor Block Diagram

CCFL Driver

Key board

Flat Panel and CCFL backlight

Main Board

RS232 Connector For white balance adjustment in factory mode

Video signal DDC

HOST Computer

18.5" LCD Color Monitor AOC e940Swa

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 Control Buttons

4:3 or wide image ratio hot key：

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 configure hot key： When there is no OSD, press Auto/Source button continuously about 2 second to do auto configure (Only for the

models with dual or more inputs). Volume adjustment hot key： When there is no OSD,press Volume(►) to active volume djustment bar,press ◄ or ► to adjust volume(Only for the

models with speakers)

3.3 Adjusting the Picture

OSD Setting

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 MENU-button to activate it.

3) Press ◄ or ► to change the settings of the selected function. Press ◄ or ► to select another function in sub-menu . 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.