Dell 1907FPc Service Manual page 57

9.2.2 Inverter/Power Board
No Power
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No power
Check AC line volt 110V or 220V
OK
Check the voltage of C903(+)
OK
Check start voltage for the pin3 of IC901
OK
Check the auxiliary voltage is between 10V-17V
OK
Check D920, D921, ZD920 Circuit
NG
Check AC line
NG
Check F901, bridge rectified circuit
NG
Check R903, R04, R905
IC921,IC902
NG
Check T901, D901
57
Dell 1907FPc