1. Check to see if your Smart TV is plugged into a proper power source, and make sure the connection is secure.
2. Check for any loose wiring connections and make sure they are securely connected.
3. Reboot the TV to see if that resolves the issue. Unplug the power cord from the wall outlet and leave it unplugged for 1 to 2 minutes.
4. If the problem persists, you may need to perform a factory reset of your Smart TV.