iPhone XS Max — mic2: Power button flex

High confidenceVerified sourceMissing sensor

On the iPhone XS Max, mic2 means: Power button flex (secondary microphone, flash side).

What does this code mean?

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.

Which part to test first?

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

The same code on other models

Field cases

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Sources