Asus VK222U Service Manual page 38

22" LCD Color Monitor
(2). No Picture
X401 oscillate waveforms are normal
No picture
Measure U701 PIN2=1.8V
Measure U702 PIN2=3.3V
OK
OK
Check if the sync signal from
computer is output and video cable
OK
Replace U401
NG
Replace U701 or U702
NG
Replace X401
NG
Input the sync signal of
computer, or change
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ASUS VK222U/S