HP L1506 Service Manual page 31

15" LCD Color Monitor
No picture (LED orange)
The button if under
control
Measure U701 PIN2=3.3V
U704 PIN2=1.8V
X401 oscillate
waveform is normal
Check HS/VS from
CN402 is normal
No picture
OK
OK
NG
OK
OK
Replace U401
NG
X401 oscillate
waveform is normal
OK
Check reset circuit of
U401 is normal
OK
Replace U401
NG
Replace U701, U704
Replace X401
NG
Check Correspondent
component
31
HP L1506
NG
Replace X401
Check Correspondent
NG
component