Lenovo L1900P Service Manual page 34

19" LCD Color Monitor
(2). No Picture
No picture
The button if
under control
OK
Measure U701 PIN2=3.3V
Measure Q703 V
OK
X401 oscillate
waveform is normal
OK
Check HS VS from
Replace U401
CN101 is normal
OK
Replace U401
NG
waveform is normal
=1.8V
collector
NG
Replace U701, Q702, Q703
NG
NG
X401 oscillate
OK
Check reset circuit of
U401 is normal
OK
Replace U401
Replace X401
Check Correspondent
component
34
Lenovo L1900P
NG
Replace X401
NG
Check Correspondent
component