AOC 931SW series - No picture (LED orange)

Service Manual AOC 931SW+
28
No picture (LED orange)
Check flow chart
for the no signal
No picture
Check signal wire
Check U404 Vout=3.3V;
Q409-out=1.8V
Replace signal wire
check X401 waveform
replaceU404,Q409,Q410,Q405
&around device
replace X401
Check CN101-RGB/HS/VS
Check U402 out
Check Correspondent
component
OK
NG
NG
NG
NG
OK
OK
OK
Replace U401
Updata soft data
OK
NG