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Repair information and guides for the CDMA version of the fourth generation iPhone. Model: A1349 / 8, 16, or 32 GB storage capacity

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Why is my iPhone warms up but not turning on?

Hi, my son dropped my iphone in toilet couple months ago. I got a new one, but I wasn't able to retrieve all my pictures and video, even some documents that were stored on that iphone. After carefully reviewing all the visor an guides I decide to repair iphone myself. I got a new battery and cleaned logic board, watch the YouTube videos and repeated all the steps. So far after putting it together iphone is still not turning on, but I feel the back of it getting warm. It's was doing same thing before I start repairing it. Is it completely broken or still have a hope?!

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When you took the phone apart, did you see any signs of corrosion anywhere in particular? Where on the back does your phone heat up specifically?

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@oldturkey03 I saw sighs of corrosion on each of the connectors, and camera connector. I soaked logic board overnight in isopropanol 91% and cleaned with tooth brush and also the parts that ididn't took out I wiped and brushed untill white corrosion was gone. It is hard to describe what part of the iPhone heats up the most. I am scared now to put it back on changer, I am hoping at least save this new battery for my new iphone, if it is not fried yet.

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Sounds like you did all the right things in cleaning it. Definitely cleaned it properly:-) Sometimes on water damaged phones it is the camera that causes overheating, as well as a shorted PMIC. Try to unhook the camera and see what happens.

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So should I just leave it with charger on and let it to warm up???i thought this way it's damaging something in the phone or burning battery.

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There is warm and then there is hot :-) Have you checked your dock connector, make sure there is no corrosion on that. Do you have access to a multimeter or anything that can measure continuity? If you have a multimeter, check the voltage on your battery contacts and see what you get when your phone is plugged in. this could give us a bit more of a clue what is going on with your phone. If you leave it plugged in, do so for just a bit, not for hours.

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I have the best success rate fixing water damage on Iphones compared to any other phone and would say to use this guide and try fixing it again, Repairing iPhone Liquid Damage, the guide is for an I3 but use the same methods on your 4, also I would say try a sonic cleaner to take it one step farther, try taking the logic board to a phone shop that has a sonic cleaner or take it to a jewelry store that does sonic cleaning, with the logic board out of your phone it shouldn't cost much to get it cleaned, if these steps don't fix it then you would be looking at changing hardware on the board, good luck, If this Answer is helpful please remember to return and mark it Accepted.

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Well I used isopropanol 91%, and saw the white sighs of corrosion disappear after I scrabbled it. I just want to be able restore the year of my life from the iPhone and my work.

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Well I've been having the same problem and I was experiment with my 4s all night. I'm now at a point where the phone oscillates between this overheating issue, and a flickering yellowish display.

I solved the overheating issue after fully disassembling the phone. When you remove the circuit board you will notice a spring contact which is meant to bond the board to phone's body. In my case I found it be compressed therefore there would be no contact. You just need to pull the contact beyond its normal position to ensure contact when the board is replaced. When reassembled correctly the phone should turn on fine.

As for my flickering yellow display issue. I'm willing to take the fault there. While going over what I've done it noticed my mistakes of scratching and slightly bend the digitizer connector leads. I'm still trying...

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