You can check the following things:
1. player audio settings
2. HDMI cable connection error
3. Incompatibility between your Blu-ray player and TV
4. Blu-ray discs damage or restriction.
You can check on this tutorial for more possible causes and solutions:
Why no sound from your player
You're probably missing a codec.
get VLC Media player (free on the web) and play the movie with that.
I'll almost guarantee that VLC will play the movie properly.
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