AOC 1619Swa Service Manual page 34

15.6" LCD Color Monitor
No picture (LED orange)
The button if under control
Measure C423 (+) =1.8V
U404 PIN2=3.3V
X401 oscillate waveform is normal
OK
Measures U402, U403 are normal
OK
Check HS/VS from CN101 is normal
OK
Replace U401
No picture
NG
OK
OK
NG
NG
Replace the key button
NG
Check CN404 or replace Q409,
Q410, and U404
Replace X401
Replace U402, U403
NG
Check Correspondent component
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AOC 1619Swa