Asus MW221C Service Manual page 36

22" LCD Color Monitor
(2). No Picture
X401 oscillate waveforms are normal
No picture
Measure U702 PIN2=3.3V
D701(-)=1.8V
OK
OK
Check if the sync signal from
computer is output and video cable
OK
Replace U401
NG
Replace U702, Q702 or
D701
NG
Replace X401
NG
Input the sync signal of
computer, or change
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ASUS MW221C