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I was given an iphone 4 to fix. I've replaced screens before, but this guy tried to do it himself but he couldn't do it. When I got the phone, the flash lit up. It wasn't a full "flash" like you get from some flashlight applications, it was just dimmly lit.

I took apart the phone. Successfully put it back together, and the little light from the flash was still there. Even when the phone is powered off, it stays on. I can go into the camera app now, and if I take a picture, it FLASHES, but then it stays dimmly lit. Any ideas at all? Hardware problem? Is there anyway to reset this?

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This is definitely a hardware problem. It comes from the flash not being properly connected or the connectors on the board being damaged. Normally reseating the connection fixes the issue. He was probably a little heavy handed when he put the phone back together or the board has suffered ESD damage.

As well as this being annoying, it will drain the battery.

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