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AOC LM928
SERVICE MANUAL
19" LCD Monitor
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THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT
HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE
ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR
CHANGES, ERRORS OR OMISSIONS.
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AOC LM928
Table of Content
Revision List......................................................................................................................... 3
1. Monitor Description........................................................................................................... 4
2. LCD Monitor Description..................................................................................................... 5
3. Operating Instructions........................................................................................................ 6
3.1 General Instructions......................................................................................................... 6
3.2 Control Buttons............................................................................................................... 6
3.3 Adjusting the Picture........................................................................................................ 7
4. Input/Output Specification................................................................................................... 9
4.1 Input Signal Connector..................................................................................................... 9
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4.2 Factory Preset Display Modes............................................................................................ 10
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4.3 Power Supply Requirements............................................................................................. 11
4.4 Panel Specification.......................................................................................................... 11
4.4.1 Display Characteristics................................................................................................ 11
4.4.2 Optical Characteristics................................................................................................ 12
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4.4.3 Parameter Guide Line For CCFL Inverter........................................................................ 13
5. Block Diagram................................................................................................................... 14
5.1 Monitor Exploded View..................................................................................................... 14
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5.2 Software Flow Chart......................................................................................................... 15
5.3 Electrical Block Diagram................................................................................................... 17
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5.3.1 Main Board............................................................................................................... 17
5.3.2 Inverter/Power Board.................................................................................................. 18
6. Schematic......................................................................................................................... 19
6.1 Main Board.................................................................................................................... 19
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6.2 Adapter Board................................................................................................................ 25
6.3 Inverter Board................................................................................................................ 26
7. PCB Layout...................................................................................................................... 28
7.1 Main Board.................................................................................................................... 28
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7.2 Adapter Board................................................................................................................ 29
7.3 Inverter Board............................................................................................................... 30
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7.4 Key Board................................................................................................................... 30
8. Maintainability................................................................................................................... 31
8.1 Equipments and Tools Requirement.................................................................................... 31
8.2 Trouble Shooting............................................................................................................. 32
8.2.1 Main Board............................................................................................................... 32
8.2.2 Inverter/Power Board.................................................................................................. 35
8.2.3 Keypad Board........................................................................................................... 36
9. White-Balance, Luminance adjustment............................................................................... 37
10. EDID Content................................................................................................................... 38
11. BOM List........................................................................................................................ 39
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AOC LM928
REVISION LIST
Revision Date Revision History TPV Model
A00 Nov-25-05 First Version Release T980KA2HLLMKN
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AOC LM928
1. MONITOR SPECIFICATIONS
Driving system TFT Color LCD
Size 48.0cm(19.0")
LCD Panel Pixel pitch 0.294mm( H )x 0.294mm( V )
Viewable angle 140