The easiest way to fix i.
HDMI to Toslink Adapter $11
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Otherwise you will have to play around with TV settings, these are some of the culprits that differ between models. This can be quite frustrating to figure out if you haven't played around with various audio options before.
Under Preferences → Sound/Subtitles → Switch audio output based on media → Off
Menu → Sound → SRS TruSurround HD → Set to Off
Menu → Sound → 3D Audio → Set to Off
Menu → Sound → SPDIF Output → Audio Format → Set to PCM
Menu → Sound → SPDIF Output → Audio Delay → Set to 0
Menu → Sound → Speaker Settings → Auto Volume → Set to Off
You can also enter Debug mode and read what the TV is...