Not much to go on there....
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All of my tvs are connecting to the internet except my livingroom tv. Why
What is the make/model of the TV that won't connect? Have you checked its WiFi settings and are there any error messages? Does the TV have a WiFi connection but no Internet or no WiFi at all? How does the distance your living room TV is from the WiFi modem/router compare to the other TV's?
Dis it ever work or is this a new setup ? Are you associating it with your home network's current WiFi broadcast name (SSID) and your WiFi network's current password / network security key ?