Acer AL1951 Service Manual page 34

3. Panel Power Circuit
Check Correspondent
component.
Measure Q703 base
is high level?
NG
OK
Check Q703 and Q704 are
broken or CN503 solder?
NG
OK
Replace PANEL
X402 oscillate waveform
is normal
OK
Replace U402
Replace U401
34
NG
Replace X402
NG