Power Board - HP VP17 Service Manual

17" LCD Color Monitor
Panel Power Circuit
Check CN301 PIN 1-2 should have
response from 0V to 5V When we
switch the power switch from on to off
Replace panel

9.2.2 Power Board

1. No Power
Check AC line volt 110V or 220V
OK
Check the voltage of C907(+)
OK
Check start voltage for the pin3 of IC901
OK
Check the auxiliary voltage is between 10V-16V
Check IC901,T901,D900,D901,Q901,D903,
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OK
No power
NG
NG
NG
Check the PPWR panel power relative circuit, Q301, Q302
In normal operation, when LED =green,
NG
Should =5 V,
If PPWR no-response when the power switch
Turn on and turn off, replace the U401- TSUM56AWHL-LF
Check AC line
Check F901, bridge rectified circuit
Check R904,R932,R933,IC901
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HP VP17