Power Board - HP LE1901w Service Manual

19" LCD Color Monitor

9.2.2 Power Board

1. No Power
Check AC line volt 110V or 220V
Check the voltage of C905(+)
Check start voltage for the pin3 of U901
Check the auxiliary voltage is between 5V-12V
Check Q901,Q902,U902,U903,ZD902
No power
NG
OK
NG
OK
NG
OK
NG
OK
Check AC line
Check F901, bridge rectified circuit
Check R904,R905,R906,U901
Check U901
42
HP LE1901w