iPad Mini 2 white lines on screen

My iPad was given to me last summer of 2014. Today, its been 3 years and still alive. No dents, or even a crack. But then last month when I woke up, the screen of my iPad just had some vertical white lines all over the screen! I don't know what to do. It just doesn't go away. When I use it in full brightness then make the iPad so hot, I lock it and open it up and the white lines are gone but when the iPad cools down and I would put down the brightness, the white lines would flash back again. What do I do now? Is it an LCD issue? I just recently bought a replacement LCD from iFixit and its on its way. I wish that would solve the problem.

I dont think the backlight is the problem. My mini isnt dark or has some dark areas on the screen. My screen also does burn in whenever I watch a steady image. So I think the lcd really is the problem right?

Did I make the right choice? Any suggestions? A reply would definitely help me a lot.

Thanks