HP 2009M Service Manual page 35

20" LCD Color Monitor
9.2.2 Power Board
1. No Power
Check AC line volt 110V or 220V
OK
Check the voltage of C905(+)
OK
Check start voltage for the pin8of IC901
OK
Check the auxiliary voltage is bigger than 10V and smaller
than 20V
Check IC901 pin5 PWM wave
OK
Check Q901,D900,D906,D908,Q903,U903,D907,ZD902
No power
NG
NG
NG
NG
OK
NG
Check AC line
Check F901, bridge rectified circuit
Check R904, R905,IC901
Check IC901,D901,C908
Check IC901
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HP 2009M&2009F