Acer AL2051 Service Manual page 35

No picture (LED orange)
The button if under
control
Measure U703 PIN2=1.8V
U705 PIN2=3.3V
waveform is normal
Check HS/VS from
CN407 is normal
No picture
OK
OK
X402 oscillate
NG
OK
OK
Replace U401
NG
X401oscillate
waveform is normal
OK
Check reset circuit of
U402 is normal
OK
Replace U402
NG
Replace U703, U705
Replace X402
NG
Check Correspondent
component
35
NG
Replace X401
NG Check Correspondent
component