Trouble Shooting - Asus MW221 Service Manual

22" LCD Color Monitor

8.2 Trouble Shooting

8.2.1 Main Board
Please reinsert and make sure
the AC of 100-240 is normal
No power
Press power key and look
if the picture is normal
NG
OK
Measure U702 PIN2=3.3V
D701(-)=1.8V
OK
X401 oscillate waveforms
are normal
OK
Replace U401
Reinsert or check the
NG
Adapter/Inverter
section
NG
Check CN701 or replace
U702，Q702 or D701
NG
Replace X401
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ASUS MW221