What is the model number of your TV, and is it HD or UHD?
If it’s 720p or 1080p (HD) then I am sorry to say that you are out of luck.
As it seems that Plex has now dropped support for non-UHD (4K) smart tv’s.
See my forum post for more details: https://forums.plex.tv/t/lg-28tn515s-plex-is-not-reachable
