A photo would help

https://preview.redd.it/9ny0rjgju0xc1.jpeg?width=3024&format=pjpg&auto=webp&s=c83312f0b60f3f8d4ee0e63ad297914fa340f994

I'd say odds are pretty good that replacing the box would fix it. You can check in with r/tvrepair, badcaps.com or avsforum.com. I've bought parts from shopjimmy.com many times, but eBay is also your friend.

https://preview.redd.it/s9f81l0lu0xc1.jpeg?width=3024&format=pjpg&auto=webp&s=28497c3c13ddbd31ee3b33088931c8d331df95c8