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Service Manual
11. Trouble Shooting
11.1 Main Board
(1). No Power
Press power key and look if
the picture is normal
Please reinsert and make sure the
AC of 100-240 is normal
Measure U404 PIN2= 3.3V
Measure Q410
No power
NG
OK
= 1.8V
Collector
OK
X401 oscillate waveforms
are normal
OK
Replace U401
NG
Reinsert or check the
Adapter/Inverter section
NG
Replace U404 or Q410
NG
Replace X401
58
ASUS VH222S&VH222D
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