Have you tried taking off the screen protector? I realise they can be expensive but you never know. If you still see yellow lines, I'm no expert but perhaps it's a dodgy graphics card thing. I had the dreeded green screen and had to open my iPad to adjust it. Am wondering if you are having similar problems to the green screen.
@azonie
So there was nothing to do with the screen protector itself?
or ..it could be a bad display..![]()