Dell E178FPC - Page 53

17" LCD Color Monitor Dell E178FPC
53
No Backlight
Check CN902 Pin 3, 4=12V
NG
OK
Check adapter and F902
Check ON/OFF signal
Check Interface board or main board
NG
OK
Check IC801 PIN2=5V
NG
OK
Change on/off circuit
Check IC801 PIN13 have triangle wave
NG
OK
Change IC801, C810
Check IC801 PIN1/PIN15 PWM wave
NG
OK
Check Q805/Q806，IC801
Check the output of PT801, PT802
Check connecter & lamp
OK
NG
Change PT801, PT802, and
feedback circuit