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DELL E173FP Service Manual
32
8.2.2 Power/Inverter Board
1.) No power
Check to CN102 Pin9 and
pin10 = 5V
Check Interface board
OK
NG
Check AC line volt 120V or 220V
NG
OK
Change F901 , check BD901,Q903,IC901
Check the voltage of C904(+)
Check bridge rectified circuit cFailure point
NG
OK
Check start voltage for the pin3 of IC901
Change IC901
NG
Repeating the start voltage
Check the auxiliary voltage is smaller than 20V
1) Check IC902, IC903
2) Check Q901,Q902…OVP circuit
NGOK
Check R919, D910,D911,D912,D913, ZD904