Navigate to Settings > Support > Self Diagnosis, and then select Start Sound Test. If the test reveals a problem, navigate to Settings > Sound > Expert Settings, and then select Reset Sound. Note: If you are still experiencing an issue after resetting the sound, visit our Support Center to request service.
Why does my TV suddenly have no sound?
Check the audio settings on your TV and connected devices. Turn off and unplug your TV and connected devices. Inspect the TV cables and ports, then check the ones on your devices as well. Swap out the media device for another one, or change the TV's speaker output to the internal speakers to see if it fixes the sound.11 May 2021