Acer AL1922 Service Manual page 44

3. Panel Power Circuit
Check Correspondent
component.
Measure Q402 base
is high level?
OK NG
Check Q402 and Q401 are
broken or CN401 solder?
NG
OK
Replace PANEL
Measure U701 PIN2=1.8V
U702 PIN2=3.3V
OK
X401 oscillate waveforms
are normal
NG
OK
Replace U401
43
NG
Replace U701, U702
Replace X401