AOC e2040S User manual

20" LCD Color Monitor AOC e2040S
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Service
Service
Service
HorizontalFrequency
30-83 kHz
TABLEOFCONTENTS
Description Page 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.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
Table Of Contents.......…….................……...........…........1
Revision List.…........................………................……......2
1. Monitor Specification.................................………........3
2.LCD Monitor Description…………………………….......4
3. Operation Instruction…………...................…...........5
3.1 General Instructions.....................................…...........5
3.2 Control Button……………………………..……...........5
3.3 Adjusting the Picture...........................…............5
4. Input/Output Specification............……………............8
4.1 Input Signal Connector............…..……................8
4.2 Factory Preset Display Modes.........................9
5 Panel Specification.....…………………........................10
5.1 Display Characteristics………………………………10
5.2 Optical Characteristics………………………………..10
5.3 Parameter guide line for CCFL Inverter……………..10
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Block
Diagram
1
1
Table Of Contents.......…….................……...........…........1
Revision List.…........................………................……......2
1. Monitor Specification.................................………........4
2. LCD Monitor Description…………………………….......5
3. Operation Instruction…………...................…...........7
3.1 General Instructions.....................................….........7
3.2 Control Button……………………………..…….........7
3.3 Adjusting the Picture...........................…...........7
4. Input/Output Specification............……………............13
4.1 Input Signal Connector............…..……................13
4.2 Factory Preset Display Modes...........................14
4.3 Panel Specification.....……………….......................15
5. Block Diagram…….…................………….........24
5.1 Software Flow Chart…….…..........………….........24
5.2 Electrical Block Diagram………...………...…......26
6. Schematic……………………………………………. 28
6.1 Main Board…………..............................................28
6.2 Power Board....……………....................................33
7. PCB Layout..…………............................................35
7.1 Main Board……………......................................35
7.2 Power Board….....................................................36
7.3 Key Board……………….....................................38
8. Maintainability………...............................................39
8.1. Equipments and Tools Requirement.....................39
8.2. Trouble Shooting…………....................................40
9. FOS Testing………………………………………44
10. Firmware and DDC Instruction……………….….56
11. White-Balance, Luminance adjustment.................64
12. Monitor Exploded View……..……………............65
13. BOM List....……....................................................66

20" LCD Color Monitor AOC e2040S
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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.)

20" LCD Color Monitor AOC e2040S
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Revision List
Version Date Revision History Remark
A00 Sep.-28-2010 Initial release
TAAGNRNEWWA1NNE
TAAGNT2CWWA12NE

20"LCDColorMonitor AOCe2040S
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1. Monitor Specification

20" LCD Color Monitor AOC e2040S
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2. LCD Monitor Description
The LCD monitor will contain a main board, an adapter board, a converter 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
Converter board
Flat Panel and
LED backlight
Main Board RS232 Connector
For white balance
adjustment in factory
mode
LED Drive.
Video signal, DDC
HOST Computer
Key Board
Adapter

20" LCD Color Monitor AOC e2040S
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View and Dimension

20" LCD Color Monitor AOC e2040S
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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 to do auto configure
(Only for the models with dual or more inputs).
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.

20" LCD Color Monitor AOC e2040S
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Luminance

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Image Setup

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Color Temperature

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20" LCD Color Monitor AOC e2040S
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Color Boost

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Picture Boost

20" LCD Color Monitor AOC e2040S
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OSD Setup

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Extra

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Reset

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Exit
LED Indicator

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4. Input/Output Specification
4.1 Input Signal Connector
D-SUB connector

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4.2 Factory Preset Display Modes