Trouble Shooting - HP LP2475w Service Manual

24" LCD Color Monitor

9.2 Trouble Shooting

No power
Press power key and look if
the picture is normal
The AC of 100-240 is normal Please
reinsert and make sure
Measure U406 PIN 5/6 = 1.8 V
Oscillate waveforms are normal?
Replace U104, U401
No power
NG
OK
U407 PIN 2 = 2.5 V
U403 PIN 2 = 3.3 V
NG
OK
X401 and X101
NG
Replace X401,
OK
Reinsert or check the
power section
Measure CN402 PIN2/3/4 = 5 V
PIN11/12 =12 V
OK
Replace U406, Q407, U403
X101
38
NG
Check power section
HP LP2475w