mic2 — Missing sensor

Watchdog panic: thermalmonitord no longer receives readings from the “mic2” sensor (secondary rear microphone), carried by the power button / flash flex; with no news from it for ~3 minutes, iOS restarts the iPhone, in a loop as long as the sensor stays missing.

On iPhone SE (2nd generation), iPhone 12 Pro Max, iPhone 12 Pro, iPhone 12 mini, iPhone 12, iPhone 11 Pro Max, iPhone 11 Pro, iPhone 11, iPhone XS Max, iPhone XS, iPhone XR

Power button flex (secondary microphone, flash side)

High confidenceVerified sourceMissing sensor

First check

Inspect the power button flex (pry marks near the connector, tears), test with a known-good flex, then diode mode on the connector.

iPhone SE (2nd generation) ›iPhone 12 Pro Max ›iPhone 12 Pro ›iPhone 12 mini ›iPhone 12 ›iPhone 11 Pro Max ›iPhone 11 Pro ›iPhone 11 ›iPhone XS Max ›iPhone XS ›iPhone XR ›

Sources