Asus VB191D Service Manual page 35

19" LCD Color Monitor
(2). No Picture
X401 oscillate waveforms are normal
No picture
Measure U701 PIN2=3.3V
Measure U702 PIN2=1.8V
OK
OK
Check if the sync signal from
computer is output and video cable
OK
Replace U401
NG
Replace D701, U701 or U702
NG
Replace X401
NG
Input the sync signal of
computer, or change
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ASUS VB191D