so I replaced both the battery and the lightning cable in mine, and once I completed the reassembly process completely, the phone still will not charge or boot up.

It did not boot up or charge before hand, so I thought it was either the battery or the lightning port. the battery got pretty beat up during disassembly, so I ordered a new one along with a new port. the port failed a test with another battery.

I have gone back multiple times to make sure the cables are connected correctly and everything, so does anyone have any idea as to what the issue is or could be?