Asus MW221C - 8.2 Troubleshooting; 8.2.1 Troubleshooting: Main Board

22" LCD Color Monitor ASUS MW221C
35
8.2 Trouble Shooting
8.2.1 Main Board
No power
Press power key and look
if the picture is normal
Please reinsert and make sure
the AC of 100-240 is normal
Reinsert or check the
Adapter/Inverter
section
X401 oscillate waveforms
are normal
Check CN701 or replace
U702，Q702 or D701
Replace U401
Replace X401
OK
OK
OK
NG
NG
NG
NG
Measure U702 PIN2=3.3V
D701 (-)=1.8V