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iPhone 4 keeps restarting and not charging

Hi - i've got an iphone 4 that i recently disassembled to replace the power button. This went fine and everything worked except i noticed after a couple of days that the proximity sensor wasn't working. I disassembled again to put a bit of sharpie on the uv filter (as suggested on the forums), and reassembled. I tested the proximity sensor and this now worked. I now have a problem where the phone keeps restarting after ~2 minutes and the battery won't charge. I have tried a replacement battery and the issue continues. I've tried Restoring the phone software (does not restart while restoring) however the problem continues once the phone tries to set itself up. I must've damaged something on the logic board when reassembling - can anyone advise what part needs changing?

Thanks

Answer this question I have this problem too

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Start by checking the components around your battery connector as well as the connector itself.

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Just as an update, after doing some continuity testing, one of the links between the battery connector and the relevant motherboard capictor was broken. I've seen a few posts about soldering a jumper wire in but thats beyond my skills... selling on Ebay for parts instead.

Thanks for your help

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