Acer H235H manual Power Board, No power

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5.Power Board

1)No power

Check CN902 PIN3, 4 = 5V

NG

Check AC line volt 110V or 220V

OKNG

Check the voltage of C905 (+)

OKNG

Check start voltage for the pin3 of IC901

NG

OK

Check the auxiliary voltage is bigger than 11V and smaller than 25V

Check AC input

Check bridge rectified circuit and F901 circuit

Check R904, R905 and Change IC901

OKNG

Check IC901 pin8 PWM wave

1)Check IC901

2)Check R909/D901/C908/C907circuit

OKNG

Check D906/D907/D908/IC903/Q903/ZD902

Check IC901

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Contents Acer H235H Service Guide Service Guide Version and Revision Copyright DisclaimerTrademarks ConventionsPreface Precautions Special Notes on LCD MonitorsTable Of Contents Chart of H235H IntroductionScope DescriptionStandard Test Conditions Electrical Requirements of H235HMeasurement systems LCD Monitor General Specification 55.2 41.4 General Specifications LCD Panel Specification of H235HElectrical Characteristics Optical Specifications Page Factory Preset Timing of H235H Monitor Block Diagram Main Board Diagram Power Board Diagram Software Flow Chart Remark Main Board Layout Symbol Description Installation Screen Position Adjustment Attaching the BaseFront panel controls Page How to Adjust a Setting Page Using the Right Power Cord Tool for disassembly is as follows Disassembly ProcedurePage Page Page Lvds cable Remove the five screws remarked in red Page Panel No Power No Picture LED is orange Panel Power Circuit OK NGKey Board Power Board No powerNo Backlight Connector Information Pin color display signal cable Exploded Diagram Model H235H FRU Field Replaceable Unit List ChapterDescription TPV Part No Acer Part no `ty Part List Picture Description TPV Part No Acer Part noCBPCRA6ABQ4 Main Board TO252RED TSUMO58GDJ-LF-1 Lvds Wafer Connect Hdmisel Output IC with Heat-sink90G6119-1 Power board KBP208GXxxx