Dell E176FPc - Inverter;Power Board Issues

Dell E176FPc
45
9.2.2 Inverter/Power Board
No Power
Check to CN701 Pin2=12V
Check Interface board
Check AC line volt 110V or 220V
OK
NG
OK
Check AC line
Check the voltage of C904(+)
Check F901, bridge rectified circuit
Check start voltage for the pin8 of IC901
Check R903, R904, IC901
Check the auxiliary voltage is between 10V-16V
1) Check IC902, IC903
2) Check Q902, Q903 OVP circuit
NG
OK
Check D921, D922
OK
OK
NG
NG
NG