Chosen Solution
So about 2 months after I replaced the iPhone 6 plus LCD this happened!
http://oi66.tinypic.com/5v92j5.jpg It is static. The touch seems to respond as I can blindly hold the power button and slide to turn off but the image doesn’t change! Anyone encountered this before please help!
I actually saw this for the first time today on a 6+, may not be the same issue though as this one would be fine but freak out periodically go all staticy then screen would go blank, I worked out that somehow the phone had overfilled the memory by 2.5Gb (don’t ask me how or why that was just what iTunes told me) and I noticed that it had downloaded the latest update so I installed it (freed up about 3Gb) and it seemed to come right, hasn’t freaked out yet (after about 3 hours of testing)