Dell E173FP service manual Power/Inverter Board 1. No power, Ng Ok, Ok Ng

8.2.2Power/Inverter Board 1.) No power

Check to CN102 Pin9 and

pin10 = 5V

NG OK

Check AC line volt 120V or 220V

DELL E173FP Service Manual

Check Interface board

NG

OK

Check the voltage of C904(+)

NG

OK

Change F901 , check BD901,Q903,IC901

Check bridge rectified circuit cFailure point

Check start voltage for the pin3 of IC901

NG

Change IC901

Repeating the start voltage

Check the auxiliary voltage is smaller than 20V

OK NG

1)Check IC902, IC903

2)Check Q901,Q902…OVP circuit

Check R919, D910,D911,D912,D913, ZD904

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