A board, LCD, connections. But you need a service manual and the usual gear to avoid the old swap boards and hope method. I'd shop another TV if OOW (out of warranty.) Sorry but I see no TV techs here and my view as an electronics designer is no service manual means we are guessing.
More at https://www.shopjimmy.com/tv-repair-tips
My Vizio tv is showing vertical lines (yellow) all across the screen. I replaced the t con board but nothing happened. Any suggestions?