AOC 931SW series - White screen

Service Manual AOC 931SW+
29
White screen
Check connector
Replace Panel
White screen
Measure Q404-base
is low level?
Check Q405=5V
Or CN403
solder?
Check around
device
Check X401 waveform
Check U402
Check flow chart
For the white screen
Replace X401
Check around
device
Updata soft
Replace U402/U401
NG
NG
NG
NG
OK
OK
OK
OK