AOC i2252VW, Service Manual

Page: 39 / 65

Service Manual AOCi2252VW
39
No picture (LED orange)
Whitescreen
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 U403/U402
Check flow chart
For the white screen
Replace X401
Check around
device
Updata soft
Replace U402/U403/U401
NG
NG
NG
NG
OK
OK
OK
OK
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/U403 out
Check Correspondent
component
OK
NG
NG
NG
NG
OK
OK
OK
Replace U401
Updata soft data
OK
NG