HP LP2475w Service Manual page 42

24" LCD Color Monitor
9.2.2 Power/Inverter Board
1. No Power
Measure CN904 PIN 2/3/4 = 5V
Disconnect the cable connecting
main board and PWPC board,
check if the 12V and 5V voltage in
PWPC board is normal?
Check the voltage for the PIN 7 of
IC902 is between 16V
Check the OUTPUT of IC902
OK
Check Q902,
Q906, T902,
D906, D905,
D907,
PIN 11/12 = 12V
NG
OK
NG
Check B+ voltage
Check the main board. (Refer to the
OK
Main board trouble shooting)
Attention:
1. Be sure the grounding is OK.
2. Cut off the power when soldering.
CheckF901, NR901, DB901,
NG
OK
Replace IC902
42
Check C914 (+) = 300V
NG
D901, Q901
Check Q902, IC902
HP LP2475w