We use a pair of tweezers to dig out the last bits behind the motherboard.

The missing piece: a small interconnect board for the power and volume buttons. We find the following chips:

IDT P9221 wireless power receiver

Lattice Semiconductor iCE40LM1K-CM36 iCE40 FPGA

Cirrus Logic CS35L35A audio amplifier

Texas Instruments LM3644 1.5 A camera flash LED driver

With the Mate's brains dissected, it's time to head towards the other end of the phone and check out its fancy footwork.