Sound dropout can originate from multiple sources, including your TV, your device/media player, or the content you’re viewing. You’ll first want to rule out your TV as the culprit by power cycling the system.
Turn off your TV and unplug the power cord from the electrical outlet.
Press and hold down the power button on the TV for 30 seconds. (This depletes any residual electrical charge within the TV.)
Reconnect the power cord and turn on the TV.
Note: Consult with your TV’s manual for more specific troubleshooting instructions.