Chosen Solution
I got an iPhone 6 into my shop today. The phone has had a screen replacement (and the battery removed, and slightly pierced). 2 months later the phone only boots to the apple logo for a split-second, and the the backlight fails. I have noticed that if I hold the powerbutton pressed, the logo will show 5-6 seconds, and the the same. Could this be long screw damage? Have tried a new battery, and a new screen
We ended up fixing with a DFU more reset! (and a new battery, since it was pierced) Hope this helps!
I also have this problem does anybody have a fix?