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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.
Page 1 of 61
LM-729 Service Manual Rev: A
Prepared: Shiwei
Date: Jul-30-03




Page 2 of 61
LM-729 Service Manual Rev: A


Revision History
Revision Date Page Items Modification

A Date:Jul-30-03 All First version release;




Page 3 of 61
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


Page 4 of 61
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




Page 5 of 61
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