After a better examination it seems this metal contact mentioned only makes contact with the top of the rear housing of the phone. I would assume it's a part of the grounding or power system, because this contact ties in with other areas of the back housing that other contacts on the daughter board make to the back housing.
I am wondering if it ties in with the power button somehow (the contact resides right beside the power button).
I have come to this conclusion because the phone's charge led lights up and stays solid orange while charging like it is supposed to, and I have checked my battery with a voltage meter and it works but no matter what way I try to power the phone up (power button only, power + up volume, power + down volume, power + up and down volume) the phone never turns on.
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