Optima L903AD+ Service Manual page 40

19" LCD Color Monitor
No picture (LED orange)
No picture
The button if
under control
OK
Measure D701(-)=1.8V
U702 PIN2=3.3V
NG
OK
X401 oscillate
waveform is normal
NG
OK
Check HS/VS from
CN405 is normal
Replace U401
NG
OK
Replace U401
Check U701, D701,
D702, Q702
Replace X401
Check Correspondent
component
40
Optima L903AD+