I have a Sony KDFE50A10 50 inch HDTV

Hi,if its a an LCD RPTV it sounds like a light engine problem.Basically your tv uses 3 LCD chips that create the image .Each chip is like a tiny screen that blend together to get the colors and picture right.They are green,red and blue.When they start to fail you will start to get color discoloration or vertical lines.You will need to replace the light engine.God bless you!