Here are some tips for fixing the audio being out of sync with the video on a Smart TV:

1. Check to ensure that the correct TV input is selected.
2. Verify that the TV’s audio settings are correctly configured.
3. Check that the cables connecting the audio equipment to the TV are firmly plugged in.
4. If using an external audio system, ensure that the settings are properly configured to display audio and video in sync.
5. Reset the audio and video settings on the Smart TV, and if necessary, reset the TV to its factory settings.