How long have you bought the TV? Use your phone and try to connect to the wifi at the tv location. Check if you can see the wifi network SSID name. Where is the router box located in the house? If it is far then try bringing the TV closer to the router box and try to connect. If this is an old TV then your main board and wifi board in the tv could be defective.
Do you have wireless internet?do you know all your passwords for your modem?
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