Dell E1909Wc - Page 48

19" LCD Color Monitor Dell E1909Wc
48
9.2.2 Power/Inverter Board
No power
Check bridge rectified circuit and F901 circut
1) Check IC901
2
)
Check IC901 over current
p
rotect circuit
Check CN902 pin4，5= 12V
Check the voltage of C905(+)
Check start voltage for the pin8 of IC901
Check R904,R932,R933 and Change IC901
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
NG
NG
NG
Check D900, T901, D906, D905,
Q902,Q921,IC903,IC904, L904, ZD902, ZD921
Check IC901 pin5 PWM wave
Check IC901,Q901,D903
NG
OK
NG
OK
OK
OK
OK
Check AC line volt 110V or 220V
Check AC input