Lenovo L172 Service Manual page 30

17" LCD Color Monitor
(2) No picture
No picture
Measure U701 PIN2=3.3V,
U702 PIN2=1.8V?
OK
X401 oscillate waveforms are
normal
OK
Check if the sync signal from
computer is output and video cable
is connected normally
OK
Replace U401
NG
Replace U701, U702
NG
Replace X401
Input the sync signal of
NG
computer, or change
the cable
30
Lenovo L172