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Logic board heats up as soon as it's put in

Hi there. I bought an iPhone 3G 8g and at first it wouldn't turn on at all. I have since worked out that the battery was completely dead when I got it. Put it into another iphone3g 8g and charged it then put it back into original phone but before I even got to putting the screen back in the logic board was so hot I had to take it back out with tools. Just sitting the logic board into place no screws no conectors attached it gets very hot closest to connector 5 and 6. Does this mean all is lost?

Thanks

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Replace the battery with a new one. It should not have anything to do with what iPhone you charged it. Since it charges in one, but not the other phone, you may have a different problem all together. Since you are not sure, what works and what does not, start at a known good point. A new battery is not very expensive, but will provide you with that point. Do you know anything about the history of the phone? I would treat it like a liquid damaged phone first. Clean it according to this guide iPhoneの水濡れ･水没ダメージからの復旧方法 While you clean, do a visual inspection. Use a magnifying lens to look at the SMD (little electronic components on the board) and see if anything looks like it is out of place. As for the place where your phone heats up, not exactly sure since I can't see your phone, but it does not sound like the power management IC. That one is located on the right lower half of your board. Battery charger and USB IC is on the left upper half of the board. iPhone 3G Teardown step 19 will show you the component layout. Check your dock connector as well, look for bend, corroded pins and again for missing or burnt looking components. Once you have it cleaned, and installed a new battery, keep it disconnected from the rest of the phone for a couple of hours (overnight). Do not rush things by being overzealous. Anyhow, give it a try and let us know how it is going. Good Luck. BTW also try to use an Apple AC wall adapter to charge. Some of the "cheaper" aftermarket ones can really fry your battery and your board.

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Ok so put the battery back in and sat the logic board on top and waited for it to heat up. Takes about 20 secs it is def the USB battery charger part that gets hot. So hot that you can not hold onto it for longer than a second or two. I have tried it with another battery and same result. Btw thanks everyone for your help it is much appreciated

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Also forgot to mention the inside is clean as a whistle no sign of water damage. I have had one with water damage corrosion and this one is clean. There is another part that looks to be damaged at the bottom just trying to work out what the part is called

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Are you charging from a USB port? Have you checked your dock connector?

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Yes charging from a USB but even if I hold the logic board and battery together out side of the body of the phone and hold the connectors together it starts heating up. Had a spare dock connector and it made no difference.:(

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Also located the little part that looks to be damaged. It's the unlabeled one to the right of the green dot on the link you pointed me to. Do you know what the part is called

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Which battery did you charge into the other iPhone 3G ? The dead one ?

Batteries used to get quite hot when charging but as it is into the case you couldn't notify it. Did you try to turn it on ? Maybe your battery is really dead and is not charging anymore

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I had 2 iPhone 3G 8g so the transfer of batteries was just to see if the battery worked. Tested both batteries in the working phone and both were fine. Is it worth putting the whole thing back together without the battery and plugging it in or do you think it might be risky to plug it into the computer via USB will this damage the board more?

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I can't really say. Is it still heating now or was it just the battery after being charged ? Maybe you could reassemble it, put all the connectors back including the one of the lcd and home button and turn it on without closing it.

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This just happened to me today on a 3gs. I suspect it wasn't the battery, but the logic board.

I've had the logic board in the phone once before, testing to see if it worked. when it did not work right away, I took it out. Today, I thought maybe I rushed the assembly and maybe missed a connection, so I tried again. As I was replacing the screws, I started noticing the heat increasing very rapidly. I rushed to remove the screws and the logic board.

The logic board was a purchase, so I don't know the history accept "phone was dropped and does not turn on", but I do know the phone works, without overheating, with a completely different logic board. Still not sure if I did something wrong in the assembly, but it heated up so quickly, I was afraid to try again.

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the wrong battery is installed. check the old battery rating to the new one. the check with the manufacturer for the correct ratting. good luck.

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Jennie さん、ありがとうございました！
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