Asus VW224U - Trouble Shooting; Main Board Troubleshooting

Service Manual ASUS VW224U&VW224S
73
11. Trouble Shooting
11.1 Main Board
(1). No Power
No power
Press power key and look if
the picture is normal
Please reinsert and make
sure the AC of 100-240 is
Reinsert or check the
Adapter/Inverter section
X401 oscillate waveforms
are normal
Replace U701 or U702
Replace U401
Replace X401
OK
OK
OK
NG
NG
NG
NG
Measure U701 PIN2=1.8V
Measure U702 PIN2=3.3V