Specifications

22" LCD Color Monitor Dell E228WFP
45
9.2.2 Power/Inverter Board
No power
Check bridge rectified circuit and F901 circut
1) Check U901
2) Check U903, D902, R909…OVP circuit
Check CN902 pin3, 4 = 12V
Check the voltage of C905(+)
Check start voltage for the pin8 of U901
Check R933,R932,R904 and Change U901
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
NG
NG
NG
Check Q901, R914, T901, D903, R910,D907,
D904,U902, L903, L904, ZD902, ZD903
Check U901 pin6 PWM wave
Check U901
NG
OK
NG
OK
OK
OK
OK
Check AC line volt 110V or 220V
Check AC input