Here are some steps you can take to troubleshoot a Smart TV that is not receiving a Wi-Fi signal:

1. Check to make sure the router is powered on and that all cables are connected securely.
2. Check to see if the router settings are correct for the Smart TV.
3. Restart the Wi-Fi signal from the router.
4. Reset the Smart TV.
5. Make sure the Smart TV is within range of the router.
6. Check if you can access the internet from other devices connected to the Wi-Fi.