I have a Samsung Galaxy S4 GT-I9505 which I have owned for around a week and a half. Just to clarify: I has never been dropped on a surface, floor or in water etc. I placed it in my coat pocket last night, took it out around two minutes later to find a small curved line of what look like dead pixels in the center at the top. From this line there are multi coloured vertical lines but only below, not above. If I touch certain parts of my phone the lines fade into grey but the pixels remain. I have tried an app for fixing dead pixels and one for a backlight problem but neither have fixed my problem. I have a magnetic case which some people have said it the problem because of it causing confusion with the magnets inside the phone. If anyone has any idea on how i can fix this without having to spend tonnes of money on a new screen it would be very helpful, and if you have experienced the same thing.