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19" LCD Color Monitor I-INC AH191D
Service
Service
Service
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Horizontal Frequency
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31-80 kHz
TABLE OF CONTENTS
Description
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Page Description Page
Table Of Contents.........................................................1 6. Schematic..........................................................23
Revision List.................................................................2 6.1 Main Board..........................................................23
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Important Safety Notice............................................3 6.2 Power Board.......................................................28
1. Monitor Specification..................................................4 6.3 Key Board ...................................................30
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2.LCD Monitor Description........................................5 6.4 Audio Board.........................................................31
3. Operation Instruction...............................................7 7. PCB Layout.....................................................32
3.1 General Instructions...................................................7 7.1. Main Board.................................................32
3.2 Control Button...................................................7 7.2 Power Board..........................................34
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3.3 Adjusting the Picture..........................................9 7.3 Audio Board.................................................36
4. Input/Output Specification.......................................14 7.4 Keypad Board......................................................36
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4.1 Input Signal Connector.........................................14 8. Maintainability........................................................37
4.2 Factory Preset Display Modes..................................15 8.1. Equipments and Tools Requirement.....................37
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4.3 Panel Specification...............................................16 8.2. Trouble Shooting................................................38
5.Block Diagram...................................................19 9. White-Balance, Luminance adjustment...................44
5.1Software Flow Chart....................................19 10.Monitor Exploded View......................................45
5.2 Electrical Block Diagram.....................................21 11. BOM List...............................................................46
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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19" LCD Color Monitor I-INC AH191D
Revision List
Revision Date Revision History TPV Model
A00 Nov-02-2006 Initial release T96HM6DTWEHZAE
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19" LCD Color Monitor I-INC AH191D
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
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jeopardized by the service method selected.
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Hereafter throughout this manual, AOC Company will be referred to as AOC.
WARNING
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Use of substitute replacement parts, which do not have the same, specified safety characteristics may create shock, fire,
or other hazards. wj
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.
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FOR PRODUCTS CONTAINING LASER:
DANGER-Invisible laser radiation when open AVOID DIRECT EXPOSURE TO BEAM.
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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.
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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.
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Take care during handling the LCD module with backlight unit
-Must mount the module using mounting holes arranged in four corners.
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-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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19" LCD Color Monitor I-INC AH191D
1. Monitor Specifications
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19" LCD Color Monitor I-INC AH191D
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.
Monitor Block Diagram
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CCFL Drive. Flat Panel and
CCFL backlight
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RS232 Connector
Power board Main board
(Include: adapter, inverter) For white balance
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adjustment in factory
mode
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Audio board Key board
Video signal, DDC
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AC-IN
100V-240V HOST Computer
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19" LCD Color Monitor I-INC AH191D
Dimensions
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19" LCD Color Monitor I-INC AH191D
3. Operating Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The control buttons are located in the front of the monitor.
By changing these settings, the picture can be adjusted to your personal preferences.
- The power cord should be connected.
- Connect the video cable from the monitor to the video card.
- Press the power button to turn on the monitor, the power indicator will light up.
3.2 Control Buttons
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19" LCD Color Monitor I-INC AH191D
FRONT PANEL CONTROL