It’s possible that your Smart TV may need troubleshooting from an audio source, cables or connections. The following is a list of steps you can take to help troubleshoot:

1. Check the TV menus for audio output settings to make sure the correct audio format and channels are set.
2. Try connecting the audio source to different audio jacks on your TV.
3. Ensure the sound destination is turned on and set to the desired level.
4. Check the volume and mute buttons on the TV and audio source.
5. Re-connect any audio cables that may be loose.
6. Check the display mode settings on your TV.
7. If running audio through an A/V receiver or digital sound system, check to make sure both devices are powered on and the necessary cables are connected.