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Logic board drains new battery right away

Hi,

I have a couple ipod touch 5's that were completely dead - showed no signs of life. If anything at all - one of them would show it's charging when it is plugged in ( still does ). I replaced the battery with a brand new one ( i bought 10 since I had a few ipods ) and checked them all with a battery checker and voltage meter and all are good.

My issue is when I solder in the new batteries, nothing changes - they are still dead so obviously it's not the battery.

Anyone have any ideas to what it could be or ran into this issue before?

Any help is greatly appreciated.

Thank you,

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It's most likely a problem with the charge circuit in your device. On iPhones, this is referred to as the U2/Tristar IC. The problem with the iPods is there are no schematics in the wild, at least none that I am aware of so micro-soldering repairs are more difficult.

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Thanks for the help. I was thinking it was the charge circuit but was hoping someone had the schematics or knew what chip/chips it was.

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