So i have a LG 65sj850t-ta TV. Its been a great TV for a few years but recently its started having issues streaming with pauses etc and can not pass an upload test on any of the speed test apps or websites.

I'm not entirely sure if its the Main card or not but at 100 odd dollars its sure cheaper then a 3000 dollar TV.

Has anyone changed out a main card before? Im a Crane Technician so i am not unfamiliar with this sort of work, just i have never worked on a television before.

(Picture is samsung tv infront of LG tv for trouble shooting)