Follow these steps to troubleshoot your Smart TV:

1. Check if the TV is firmly connected to the wall outlet.
2. Inspect power cables for signs of wear or damage.
3. Switch off the TV for a few minutes and then switch it back on.
4. Unplug all connected cables from the TV and plug them back in again.
5. Check for any loose connections.
6. Re-set the Smart TV to its factory settings.