Acer G195HQ manual Power Board, No power

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3.Power Board

1)No power

Check CN902 PIN6, 7 = 5V

NG

Check AC line volt 110V or 220V

OK NG

Check the voltage of C907 (+)

OKNG

Check start voltage for the pin8 of U901

NG

OK

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

Check AC input

Check bridge rectified circuit and F902 circuit

Check R908 and Change U901

OKNG

Check U901 pin5 PWM wave

1)Check U901

2)Check D907/Q901 circuit

OKNG

Check U901

Check D902/ Q906/Q904/U902/ZD901/U903

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Contents Acer G195HQ Service Guide T89AM6D8MXAFH2 Service Guide Version and RevisionT89AM5D8MXAFN2 Disclaimer CopyrightTrademarks ConventionsPreface Special Notes on LCD Monitors PrecautionsTable of Contents Introduction Chart of G195HQScope DescriptionStandard Test Conditions Electrical Requirements of G195HQMeasurement systems TTL LCD Monitor General SpecificationEPA Energy Star G195HQ General Specifications LCD Panel Specification of G195HQOptical Specifications Factory Preset Timing of G195HQ Monitor Block Diagram T89AM6D8MXAFH2 Dual-Input Model Main Board DiagramDVI RGBMosfet Power Board DiagramON/OFF DIM Software Flow Chart Remark Main Board Layout Symbol Description715G2883 1 Installation Attaching / Removing the Base Screen Position AdjustmentUser Controls Volume Up / DownEColor Management OSD Adjusting the OSD settingsPage Page Using the Right Power Cord Disassembly Procedure Tool for disassembly is as followsPage Page Lvds Cable Page Panel Okng Main Board 1 No PowerNo Picture LED is orange OK NG Panel Power CircuitKey Board No power Power BoardNo Backlight Connector Information FRU Field Replaceable Unit List Chapter Exploded Diagram Model G195HQDescription TPV Part No Acer Part No `ty Picture Description TPV Part No Acer Part No Part ListKEPC9QKO Page DDC2SCL DDC2SDA Main BoardAO3401L TSUM5PFHL Lock type DSUBB+ LVB0M RXO0 CBPC9M5AFQN TSUM1PEL Power board Dbrt VIN AUTO1K Key board