AOC 2230FH - Troubleshooting: No Picture

22" LCD Color Monitor AOC 2230FH
39
No Picture
No picture
Check the signal cable
Change the signal cable
Measure U103 PIN2=3.3V
U104 PIN2=1.8V
Replace U401
Measure X401 oscillate
waveform is normal
Replace U103, U104
OK
OK
OK
OK
NG
NG
Check HS/VS from CN402
is normal
Replace X401
Check Correspondent
com
p
onent
NG
NG