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AOC LM923
SERVICE MANUAL
19" LCD MONITOR
LM923
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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.
Page 1 of 55
AOC LM923
Table of Content
Revision List......................................................................................................................... 3
1. Monitor Specifications........................................................................................................ 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
4.2 Factory Preset Display Modes............................................................................................ 10
4.3 Power Supply Requirements............................................................................................. 10
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4.4 Panel Specification.......................................................................................................... 11
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4.4.1Display Characteristics............................................................................................. 11
4.4.2Optical Characteristics................................................................................................ 11
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4.4.3 Parameter Guide Line For CCFL Inverter........................................................................ 12
5. Block Diagram................................................................................................................... 13
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5.1 Monitor Exploded View..................................................................................................... 13
5.2 Software Flow Chart......................................................................................................... 14
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5.3 Electrical Block Diagram................................................................................................... 16
5.3.1 Main Board............................................................................................................... 16
5.3.2 Inverter/Power Board.................................................................................................. 17
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6. Schematic......................................................................................................................... 18
6.1 Main Board.................................................................................................................... 18
6.2 Audio Board.................................................................................................................. 24
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6.3 Power Board.................................................................................................................. 25
7. PCB Layout...................................................................................................................... 28
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7.1 Main Board.................................................................................................................... 28
7.2 Audio Board................................................................................................................... 29
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7.3 Power Board.................................................................................................................. 30
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 Power /Inverter/Board................................................................................................. 35
8.2.3 Keypad Board........................................................................................................... 37
9. White-Balance, Luminance adjustment............................................................................... 38
10. EDID Content................................................................................................................... 39
11. BOM List........................................................................................................................ 40
Page 2 of 55
AOC LM923
REVISION LIST
Revision Date Revision History TPV Model
A00 Nov-28-05 First Version Release T980KAXHLFMRA
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Page 3 of 55
AOC LM923
1.MONITOR SPECIFICATIONS
ITEMS SPECIFICATIONS
Driving system TFT LCD
Size 48.0cm(19.0")
Type M190EN02
LCD Panel
Pixel pitch 0.294mm( H )x 0.294mm( V )
Viewable angle 170