To troubleshoot internet connection on your Smart TV, consider the following steps:

1. Check the network cables are securely connected to the back of the router, TV, and wall socket with the correct media type.
2. Check that the router is on and you are connected to the same network that the TV is connected to.
3. Check if the router has a WPS button, and press it if the TV has a WPS button as well.
4. Check that the wireless connection is properly configured on the TV and that the wireless settings have not been changed inadvertently.
5. Check that the IP settings of the TV is set up correctly.
6. Reboot the router and the TV, and then try reconnecting.