Dell E228WFPc - Page 48

22" LCD Color Monitor Dell E228WFPc
48
9.2.2 Power/Inverter Board
No power
Check bridge rectified circuit and F901 circut
1) Check IC901
2) Check IC902, C914…OVP circuit
Check CN902 pin6,7 = 5V
Check the voltage of C907(+)
Check start voltage for the pin8 of U901
Check R905
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
NG
NG
NG
Check R912,D910,D900,T901,D920,Q902,
ZD920
Check IC901 pin5 PWM wave
Check IC901
NG
OK
NG
OK
OK
OK
OK
Check AC line volt 110V or 220V
Check AC input