Dell E178WFPC Service Manual page 48

17" LCD Color Monitor
No Backlight
Check F801=12V
OK
Check ON/OFF signal
OK
Check IC801 PIN12=5V
OK
Check IC801 PIN1 have triangle wave
OK
Check ZD801 has the output of square wave at short time.
OK
Check the resonant wave of pin2 & pin5 for T801
OK
Check the output of T801
OK
Check connecter & lamp
NG
Check adapter and F801
NG
Check Interface board or main board
NG
Change on/off circuit
NG
NG
Check Q805/Q806
NG
Check Q801/Q811/D810/D811
NG
Change T801
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Dell E178WFPC
Change IC801