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AOC LM725
SERVICE MANUAL
17" LCD MONITOR
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LM725
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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 RE LIABILITY FOR CHANGES,
ERRORS OR OMISSIONS.
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AOC LM725
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 Front Panel Control.......................................................................................................... 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
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4.3 Power Supply Requirements............................................................................................. 11
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4.4 Panel Specification.......................................................................................................... 11
4.4.1 Panel Feature........................................................................................................... 11
4.4.2 Display Characteristics................................................................................................ 11
4.4.3 Optical Characteristics................................................................................................ 12
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4.4.4 Electrical Characteristics............................................................................................. 13
5. Block Diagram................................................................................................................... 14
5.1 Monitor Explored View...................................................................................................... 14
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5.2 Software Flow Chart......................................................................................................... 15
5.3 Electrical Block Diagram................................................................................................... 17
5.3.1 Main Board.............................................................................................................. 17
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5.3.2 Inverter/Power Board................................................................................................. 18
6. Schematic......................................................................................................................... 19
6.1 Main Board.................................................................................................................... 19
6.2 Power Board.................................................................................................................. 24
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6.3 Audio Board................................................................................................................... 26
7. PCB Layout....................................................................................................................... 27
7.1 Main Board.................................................................................................................... 27
7.2 Power Board.................................................................................................................. 28
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7.3 Audio Board................................................................................................................... 29
7.4 Keypad Board................................................................................................................ 29
8. Maintainability................................................................................................................... 30
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8.1 Equipments and Tools Requirement.................................................................................... 30
8.2 Trouble Shooting............................................................................................................. 31
8.2.1 Main Board............................................................................................................... 31
8.2.2 Power /Inverter/Board................................................................................................ 34
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 LM725
Revision List
Version Date Revision History TPV Model Name
A00 Mar-09-06 Initial Revision T782KSQHMCPGA
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AOC LM725
1. Monitor Specifications
Items Description
Driving system TFT Color LCD
Type LTM170EU-L21
Size 43.2cm (17.0")
LCD Panel
Pixel pitch 0.264mm (H) x 0.264mm (V)
Viewable angle 150(H) 135(V) (CR 10)
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Response time (type) 8 ms
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Sync. Type H/V TTL
15Pin Analog
Input Signal
Input 24Pin Digital
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H-Frequency 30kHz