Sharp LC-32SV40U Service Manual page 43

Does not the sound of the audio signal input to VGA go out?
MAIN UNIT:
Is the audio signal properly sent to pin (3) and pin (2) of
CN1102?
YES
Is the audio signal properly sent to pin (67)
(AIN1_R) and pin (69) (AIN1_L) of IC
U2102?
YES
Refer to "No sound output in all modes".
No sound from external input devices (2)
NO
NO
42
Check the connection to CN1102 and the external input device.
Check the line between CN1102 and IC U2102.