Acer X233H Service Manual page 31

2. No Picture (LED is orange)
No picture
The button if under
control
OK
Measure U703 Pin2=3.3V,
OK
X401 oscillate
waveform is normal
OK
Check HS/VS from
CN101 is normal
OK
Replace U401
NG
X401 oscillate
waveform is normal
Check reset circuit of
U401 is normal
Replace U401
NG
Check U703, C706 and C707
NG
Replace X401
NG
Check Correspondent
component
31
NG
Replace X401
OK
NG
OK
Check Correspondent
component