Check the audio cable to make sure it is firmly connected to your Smart TV, and to the audio output of your stereo receiver.

Check the audio input settings on your Smart TV as it may need to be changed to match the type of audio connection you are using.

Check your stereo receiver to see if its settings need to be adjusted to match the audio output from your Smart TV.

Inspect your audio cables for any visible damage.

Ensure the volume settings are correctly adjusted and enabled on both the Smart TV and stereo receiver.

1. Check the audio cable connections.
2. Check audio input settings on Smart TV.
3. Check settings on stereo receiver.
4. Inspect audio cables for damage.
5. Adjust and enable volume settings.