Horizontal lines across the screen and not responding to touch.

Hi,

I have an iPhone 5C however one day it just started to having white lines horizontally across the screen and no longer responds to touch very well if at all. I know it's not the LCD as I have tried fitting another and it has the same issue and it's not due to being fitted incorrectly as the lines are horizontal and not vertical. The speaker also starts making a weird noise in time with the lines moving. Has anybody had this problem before and knows how to solve?

Thanks