Here are some steps you can take to troubleshoot audio issues on your Smart TV:

1. Check for loose plugs or cables.
2. Make sure your TV speakers are turned on.
3. Verify the audio setting in your TV menu.
4. Restart the TV and check if the audio works.
5. Check if your soundbar or external speaker is functioning properly.
6. Make sure your TV is not muted.
7. Check the audio format selection.
8. Look for an app or system update on your Smart TV.