Fix it maybe, if you are OK with buying parts for it, you may need a new system board, possibly a new screen. Usually unless you already know what you may need and know how to replace the parts it's not worth it vs just buying a used working set.
I agree. By the time you buy parts. I even saw a 50 inch smart tv at Walmart recently with roku built in for about 220. So depending what parts cost, you might consider replacing.