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iPhone 3G是第二代iPhone。型号A1241，有8或16 GB容量，和炫酷的黑色或洁白的白色塑料背面。修复比第一款iPhone更简单。需要螺丝刀、撬撬工具和吸尘工具。

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iPhone powers down after inactivity

Hey guys I have an iPhone 3G that when it's not plugged in it will turn off after about 15-30 seconds of not being used and being in sleep mode. When it's plugged in it doesn't have this problem at all. Also, you can use it for as long as the battery will last without it having this problem.

A little backstory on this device.

I got it off of eBay and the guy said it had some water damage (something to the effect that he had it with him hunting (bad idea) and it fell into a puddle). He replaced the LCD and it was working again. When I got it I had to replace the touch screen as well because that wasn't working. The battery also wouldn't hold a charge so I replaced that. Everything works on it now except the above problem. Oh also if I launch the camera it makes it restart (probably water damage issue).

Any thoughts on why it might be having this problem? Could it be the dock connector assembly maybe?

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My iPhone 3G has the same issue. I changed everything, except the mainboard. Did you fix your problem?

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I think you need to open and clean the phone with isopropyl alcohol and a soft brush. Pay attention to the connectors and area near camera/top of board, let it dry for a few hours. This may solve some issues .. It sounds like there is something shorting your camera- either dirt or corrosion. I'd then try restoring in iTunes ( back up first!) as the turning off problem maybe software related. If the phone is jailbroken I'd try deleting apps one by one to see if it's a corrupt program

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I had a similar issue the other day with a phone. It turned out to be the battery. Either not good or incompatible - often occurs on jailbroken phones. After fixing, the customer updated his firmware and ended up coming back with same issue for a different battery.

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