1. Make sure that all wires are firmly connected between the Smart TV and the Home Theater System side speakers.
2. Check if the audio settings on the Smart TV are correctly set up, and they match those on the Home Theater System side speakers.
3. Test the connection between the TV and the Home Theater side speakers using a different audio source.
4. Look for available firmware/software updates for the Smart TV and the Home Theater System side speakers.
5. Change the audio source on the Smart TV, and retest the connection.
6. Consider contacting the manufacturer’s customer support team to determine the root cause of the issue.