Acer AL1722 Service Manual page 41

3. Panel Power Circuit
Check Correspondent
component.
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Measure Q204 base
is high level?
NG
OK
Check Q204 and Q203 are
broken or CN503 solder?
NG
OK
Replace PANEL
Y601 oscillate waveform
is normal
OK
Replace U601
Replace U401
41
NG
Replace Y601
NG