Under the charging port cable, we strike daughterboard. Eureka!
The little foam foundation is the speaker box for that loudspeaker we spied in the midframe.
The daughterboard also houses a familiar classic: a coin-style vibration motor. Unfortunately, you'll need a soldering iron to replace it.
On the backside we find yet more spring contacts, a microphone, and the soft button LEDs. Like the motherboard, this daughter is a busy board.
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