Chosen Solution
Possibly unrelated, but after changing the front panel on my iPhone 6, the camera flash (not the camera itself) turned on for a split-second the first time I tried it, then went back off, almost as if it “burnt out.” Nothing I’ve tried has remedied it (restores, letting it sit without battery connected for a week). I know it’s an LED so the flash itself probably hasn’t burnt out, but is it possible I could have damaged a filter or something along the way that could cause this? If so, where should I be looking for evidence? Thanks
Have you tested it with a new camera attachment? If not you should. The whole piece needs to be replaced for one single part to work properly.