AOC 519Sw - 8.2 Trouble Shooting

15" LCD Color Monitor AOC 519Sw
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8.2 Trouble Shooting
8.2.1 Main Board
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 normal
Measure CN201 PIN3, 4=5V,
U201 PIN2=3.3V
Reinsert or check the
Adapter/Inverter section
X401 oscillate waveforms are
normal
Check CN201 or U201
Replace U501
Replace X401
OK
OK
OK
NG
NG
NG
NG
OK
Measures U401, U403 are
normal
NG
Replace U401, U403