Dell 1707FPc - No Backlight

Dell 1707FPc
57
No Backlight
Check C811=12V
Check ON/OFF signal
Check IC801 PIN2=5V+-0.25V
Check IC801 PIN10=5V
Check adapter
Check Interface board
NG
Check Q801,Q802,Q813,ZD801 circuit
NG
NG
Check IC801 PIN13 triangular wave
is normal
Check Q801,Q802,Q813,ZD801 circuit
Check R817,C810,IC801
Check Q805, Q806, PT801, PT802
NG
NG
OK
OK
OK
OK
OK