My friend's iPhone 4S Sprint model was recently repaired, and everything worked except the back camera. The phone will...

I gave it a go, and I managed to fix my screen flickering. I ended wrapping the entire LCD controller with copper foil tape. If you’re careful and have the right tools, you wont damage a thing. I documented the process over on the MacRumors Forum: https://forums.macrumors.com/threads/mac...-pro-retina-mid-2012-screen-flicker-fix.2265830/