HP L1506 Service Manual page 34

15" LCD Color Monitor
9.2.2 Power Board
1. No Power
Check AC line volt 100V or 240V
Check the voltage of C905(+)
Check start voltage for the pin3 of IC901
The auxiliary voltage (pin 7) is between 5V-12V jumping
1) Check IC901,T901
2) Check D904, D905, ZD903
3) Check IC902, IC903
Check D904 D905 ZD903...
No power
OK
OK
OK
OK
Repeating the start voltage
NG
OK
NG
Check AC line
NG
Check F901, BD901
NG
Check ZD901,R907, IC901
NG (Stable)
Check D901, D903
Check IC902,IC903
Check Q904...OLP circuit
34
HP L1506- L1506s