Dell 1907FPc Service Manual page 56

9.2.2 Inverter/Power Board
No Power
Check AC line volt 110V or 220V
Check the voltage of C903(+)
Check start voltage for the pin3 of IC901
Check the auxiliary voltage is between 10V-17V
Check D920, D921, ZD920 Circuit
No power
NG
OK
OK NG
NG
OK
NG
OK
Check AC line
Check F901, bridge rectified circuit
Check R903, R04, R905
IC921,IC902
Check T901, D901
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Dell 1907FPc