Since you didn't give the model number or connection type (wired Ethernet or Wi-Fi), I'll start with the Ethernet setup, and I'm assuming you have not previously had the TV connected to the Internet.
First, disconnect power to the TV and the router. Power up the router first, and wait for it to establish its connection to the modem. Then connect the TV and turn it on, then test the connection. If that doesn't work, proceed to the next step below.
Review the Owner's Manual section on setting up the Internet connection. Check your router setup and make sure the TV is using the correct method for making connections to it, and that the router is not blocking the TV as an unauthorized device. By default, home routers are set up to use DHCP to automatically give IP addresses to anything connected, but many models permit setting them to block everything except devices specifically given permission. It is also possible to set up the router to use manually assigned IP addresses instead of DHCP; this would mean you have to give the TV an IP address in the same net as the router (the first three numbers in the set are the same, but the last must be between 0 and 255 and not the same as any other connected device. If the router locks out everything except specifically permitted devices, you will need to log into the router and add the TV's MAC address to the list of permitted devices (the MAC address should be on a label on the back of the TV).
If your TV uses Wi-Fi to make the Internet connection, first verify that you have adequate signal strength at the back of the TV (use a laptop computer or other device with a signal strength indicator if the TV itself does not display it in the Wi-Fi setup menu). Next, verify that the TV is using the same security protocol as the router, and that the password is correct. (Note: if you have a wireless router, it's always a good idea to make sure security is on and is not using the factory default password. This prevents freeloaders from stealing bandwidth and slowing down your connection, hacking your devices, or using your Internet connection for other ******* activity.)
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