Were you trying to repair specific problems or where you just taking them apart for fun (and practice) :>)?
If there was a specific problem, please let us know as that might give us a clue as to the root of your issue. You say the power is reaching the phone...are you using a USB Ammeter to determine this? This is fake charging and this could be caused by a damaged Tristar IC or by a missing or partially dislodged FL11 near the battery connector.
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You should also double check the Lightning connector, especially if you removed it completely. It may have been damaged in the process.