Acer AL1722 Service Manual page 44

6.No Audio
Check power supply of U701 is 12V?
Check input signal of U701is ok?
Mute and volume setting is ok?
NG
OK
OK
OK
Replace U701
NG
Replace speaker
Reset mute and
volume
NG
Check connecting is ok?
NG
Check correspondent
component
44
NG
Reconnect