Check the volume control.
Press MUTING or VOL + button to cancel muting.
Set [Speakers] to [TV Speakers] in the [Sound] setting. If it is set to [Audio
System], TV speakers do not output sound regardless of the TV’s volume
control.
When using HDMI input with Super Audio CD or DVD-Audio, DIGITAL
AUDIO OUT (OPTICAL) may not provide an audio signal.

Audio noise.

Make sure that the antenna is connected using a 75-ohm coaxial cable.
Keep the antenna cable away from other connecting cables.
To avoid TV interference, make sure to use an undamaged antenna cable.

No audio or low audio with home theater system.

Set [Speakers] to [Audio System] in the [Sound] setting.
Set [Audio Out] to [Fixed] in the [Sound] setting.

Distorted sound.

Check the antenna/cable connection.
Keep the antenna/cable away from other connecting cables.

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