What is wrong with a Samsung LE40R7 LCD Tv screen?

When watching my tv in analogue or with almost all inputs the screen has a 2 inch horizontal fuzzy line the whole way accross, there are a few inputs that werent affected depending on what method they were connected but there was no always worked or not worked connection, just seemed to depend on item. It also works fine on built in freeview still. My Freeview recorder has the strip when using scart lead but worked fine on component input going through a av amp the into the tv by hdmi, other items through the av amp had the line though.
Thanks