Specifications

22" LCD Color Monitor Dell E228WFP
46
No Backlight
Check CN902=12V
NG
OK
Check adapter and F902
Check ON/OFF signal
Check Interface board or main board
NG
OK
Check U801 PIN2=5V
NG
OK
Change on/off circuit
Check U801 PIN13 have triangle wave
NG
OK
Change U801
Check U801 PIN1/PIN15 PWM wave
NG
OK
Check Q805/Q811
Check Q802, Q809, Q812, Q813 Drain wave
NG
Check the output of T801, T802, T804, and T805
Check Q802, Q809, Q812, Q813
Check connecter & lamp
OK
NG
Change T801, T802, T804, and T805
OK