New dock connector, battery, still not recognized or charging?

I've been through the gauntlet with this phone. I hate to throw away a 64gb device, but the %#*@ thing just isn't worth spending much more time and money on. Now that I'm done venting...

I've replaced the dock connector and the battery. No water damage, and the thing was in an otter box defender, looks to be in pristine condition.

It will charge when turned off. It will not enter dfu mode. It will not charge or acknowledge being plugged in either at the wall or at the computer (several computers, Chargers, and cables tried).

I've flowed several wifi chips, repaired lots of play station and Xbox motherboards, but can't seem to find the information necessary to even begin to diagnose this problem. Likely a power management IC? Faulty inductor in the charging path?

Appreciate any help t he local wizards can give.

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