No picture and vertical lines going through screen

HI. My name is Neal. My tv was working perfectly up until a few weeks ago. Lines of red and blue came through tv vertically when I was watching something but you could still see picture. Then it was intermittent. It would be fine then gone again. But when I switched on the other day I heard a short whoosh sound like something blew. Now it's just red vertical lines in centre and left of screen. When you connect device picture goes blue but red lines remain. I followed a few you tube videos and removed boards,checked cabling and ground connections. Found a couple of loose screws on earthing points. Tightened but still remained same. Has one of the boards gone ?? I would appreciate any help. Thank you.