AOC LM729 Service manual.pdf

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LM-729 Service Manual Rev: A8. Maintainability8.1 Equipments and Tools Requirement1.) Voltmeter.2.) Oscilloscope.1.) Pattern Generator.2.) DDC Tool with a IBM Compatible Computer.3.) Alignment Tool.4.) LCD Color Analyzer.5.) Service Manual.6.) User Manual.
LM-729 Service Manual Rev: A8.2 Trouble Shooting8.2.1 Main Board1.NO SCREEN APPEARMeasured CN11 pin5 = 12 V?Measured CN11 pin 9/10= 5V?Measured U8 pin 2= 3.3V?Measured U9 pin 2= 2.5V?Yes, all DC level existDisconnected the Signal cable( Loose theSignal cable ),Is the screen show “Cable NotConnected” ?Check Correspondent component.Is there any shortage or cold solder?Yes. there have OSD showConnected the Signal cable again,Check LED status.Led GreenLed OrangeNo, nothing is showConnected the Signal cable again,Check LED status.Check Power switch is in Power-onstatus , and check if Power switch hadbeen stuck ?Led orangeReplace U6Flash RomLed GreenOK, Keyboard no stuckCheck the Wire-Harness from CN2OK,Wire tight enoughMeasured RGB (R15,R17,R24) H,V Input atU4 pin 176,177 ,was there have signal ?Check digital signal from CN1NGCheck Correspondentcomponent short/open( Protection Diode )Check Panel-Power Circuit BlockOK,Panel Power OKOK,input NormalCheck U4 Data-output BlockMeasured Crystal X1(14.318MHz)OK, U4 data OKOK,clockReplace Power board and CheckInverter control relative circuitReplace U203 (GM5126/2126)Re-do White balance adjustOKNote: 1. if Replace “MAIN-BOARD” , Please re-do “DDC-content” programmed & “WHITE-Balance”.2. if Replace “Power Board” only, Please re-do “ WHITE-Balance”
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Page 9 and 10: LM-729 Service ManualRev: AOSD Tabl
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Page 13 and 14: LM-729 Service Manual4.3 Power Supp
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Page 17 and 18: LM-729 Service Manual5.2 Software F
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AOC LM729 Service manual.pdf

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