I have a samsung plasma tv that was given to me . model number s50hw-yb01. The tv turns on fine, has audio, and for a few seconds after turning it on it works fine, but once the bar at the top that shows what input im on, the screen has yellow vertical lines across the whole tv. I opened the back to look for any loose cables and either I missed it, or that isnt it. any help would be greatly appreciated. I have pictures of it if anyone needs a visual.