Dell 1907FPc Service Manual page 58

No Backlight
Check IC801 PIN10=5V
Check IC801 PIN13 triangular wave
is normal
Check Q805, Q806, PT801, PT802
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Check C811=12V
OK
Check ON/OFF signal
OK
Check IC801 PIN2=5V+-0.25V
OK
OK
OK
NG
Check adapter
NG
Check Interface board
NG
Check Q801,Q802,Q813,ZD801 circuit
NG
Check Q801,Q802,Q813,ZD801 circuit
NG
Check R817,C810,IC801
58
Dell 1907FPc