Hanns.G HSD HG191D Service Manual page 39

19" LCD Color Monitor
8.2.2 Power Board
1. No Power
Check to CN902 Pin1, 2 =12V and Pin3, 4 = 5 V
Check AC line volt 120V or 220V
Check the voltage of C905 (+)
Check start voltage for the Pin6 of IC901
Check the auxiliary voltage is smaller than 20V
OK
Check D908, D909, ZD903...
No power
NG
OK
NG
OK
NG
OK
NG
OK
NG
Check Interface board
Change F901, Check BD901, Q903, IC901
Check bridge retified circuit
Change IC901
Check IC902,IC903
Check Q903...OLP circuit
39
HSD HG191D