Dell E157FPc Service Manual page 45

15" LCD Color Monitor
9.2.2 Inverter/Power Board
No Power
Check to CN701 Pin2=12V
Check AC line volt 110V or 220V
Check the voltage of C904(+)
Check start voltage for the pin8 of IC901
Check the auxiliary voltage is between 10V-16V
Check D921, D922
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
Check Interface board
Check AC line
Check F901, bridge rectified circuit
Check R903, R904, IC901
1) Check IC902, IC903
2) Check Q902, Q903 OVP circuit
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Dell E157FPc