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Flipping the digitizer on its back reveals the most significant change thus far from the lookalike iPad Air: the addition of Touch ID, and its associated hardware.

NXP 8461A1—also visible as a 5x4 ball grid array hiding under the speaker in this sweet X-ray image.

Probably a NXP Semiconductor NVT8461A1 (WLCSP20) secure microcontroller.

Thumbs up for fingerprint reading. Thumbs down for a harder repair, since the sensor is uniquely paired to its logic board at the factory.

At least this lovely button is still a button (unlike the solid-state un-button that debuted on 7-series iPhones). Peep that switch under the Lightning port traces.

Likely hall sensors

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