Chosen Solution
I’ve got an iPhone 6 with a weird issue: after a (little) shock, the LCD turns grey. After rebooting it works just fine again. See the video. How can this happen and how can I fix it? Thanks in advance! https://www.youtube.com/watch?v=CDUZwTLc…
That looks like a damaged/defective screen. Try a known-good replacement screen to see if that solves the problem.
