Acer AT3720A Service Manual page 70

15. AV1/S-video no sound
O
AV1/S-Video/R-L
Cable plug in?
Mute turn-off
Volume =30
AV1/S-Video Source
can Display?
AV1/S-Video Sound
Normal?
64
Check Video and R-L
cable or Replacement
Video or R-L Cable
Check Video and R-L
cable or Replacement
Video or R-L Cable
Replacement IO /B
AV1/S-Video Sound
Normal?
END
Replace
L1
M/B
Chapter 4