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LM-729 Service Manual Rev: A
SERVICE MANUAL
17" LCD Monitor
LM-729
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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LM-729 Service Manual Rev: A
Prepared: Shiwei
Date: Jul-30-03
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LM-729 Service Manual Rev: A
Revision History
Revision Date Page Items Modification
A Date:Jul-30-03 All First version release;
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LM-729 Service Manual Rev: A
Table of Contents
Table of Contents ---------------------------------------------------------------------------------------------------3
1. MONITOR SPECIFICATIONS ---------------------------------------------------------------------------5
2. LCD MONITOR DESCRIPTION ---------------------------------------------------------------------------6
3. OPERATING INSTRUCTIONS ---------------------------------------------------------------------------7
3.1 GENERAL INSTRUCTIONS -------------------------------------------------------------------------7
3.2 CONTROL BUTTONS ------------------------------------------------------------------------------------7
3.3 ADJUSTING THE PICTURE--------------------------------------------------------------------------------7
4. Input/Output Specification - -------------------------------------------------------------------------------10
4.1 Input Signal Connector --------------------------------------------------------------------------------10
4.2 Factory Preset Display Modes -------------------------------------------------------------------------- 11
4.3 Power Supply Requirements ------------------------------------------------------------------------ 12
4.3.1 Input Requirements -------------------------------------------------------------------------------------12
4.3.2 Output Requirements ------------------------------ ------------------------------------------------12
4.4 PANEL SPECIFICATION -------------------------------------------------------------------------------14
4.4.1 Panel Feature ------------------------------------------------------------------------------------------14
4.4.2 Display Characteristics --------------------------------------------------------------------------------14
4.4.3 Optical Characteristics -------------------------------------------------------------------------------14
4.4.4 Parameter guide line for CCFL Inverter ------------------------------------------------------14
5. Block Diagram ------------------------------------------------------------- -----------------------------15
5.1 Monitor Exploded View ------------------------------------------------------------------------------------15
5.2 Software Flow Chart -------------------------------------------------------------------------------------16
5.3 Electrical Block Diagram ------------------------------------------------------------------------------18
5.3.1 Main Board -------------------------------------------------------------------------------------------------18
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LM-729 Service Manual Rev: A
5.3.2 Inverter/Power Board -------------------------------------------------------------------------------------19
6. Schematic -------------------------------------------------------------------------------------------------------21
6.1 Main Board -----------------------------------------------------------------------------------------------21
6.2 AUDIO Board -----------------------------------------------------------------------------------------25
6.3 Key Board ------------------------------------------------------- ---------------------------------------26
6.4 Inverter/Power Board -----------------------------------------------------------------------------------27
7. PCB Layout -------------------------------------------------------------------------------------------------29
7.1 Main Board -----------------------------------------------------------------------------------------------29
7.2 Inverter/Power Board -----------------------------------------------------------------------------------31
7.3 Keypad Board And Audio board-------------------------------------------------------------------------34
8. Maintainability --------------------------------------------------------------------------------------------------34
8.1 Equipments and Tools Requirements ----------------------------------------------------------------35
8.2 Trouble Shooting ---------------------------------------------------------------------------------------------33
8.2.1 Main Board --------------------------------------------------------------------------------------------------35
8.2.2 Power/Inverter Board -------------------------------------------------------------------------- ----------38
8.2.3 Key Pad Board ---------------------------------------------------------------------------------------------40
9. White-Balance, Luminance adjustment ----------------------------------------------------------------41
10. EDIT Content -------------------------------------------------------------------------------------------42
11. BOM List -------------------------------------- -----------------------------------------------------------------43
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LM-729 Service Manual Rev: A
1.MONITOR SPECIFICATIONS
Driving system TFT Color LCD
LCD Panel Size 43.2cm(17.0")
Pixel pitch 0.264mm( H )x 0.264mm( V )
Viewable angle 90