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thermalmonitord watchdog · missing sensor
Missing sensor(s): mic-temp-sens1 — Microphone temperature sensor 1 (i2c3 bus)
The phone restarts about every 3 minutes with userspace watchdog timeout: no successful checkins from thermalmonitord and Missing sensor(s): mic-temp-sens1.Single source
Where to look: Devices on i2c3: dock/charge port, home button, display connectors
Single field case (7 Plus): i2c3 SCL stuck low; bus is shared, so disconnect those flexes one at a time.
Bench checks
Isolate with known-good parts / a known-good housing.
Sources
- iFixit Answers - iPhone 7 Plus i2c3 SCL stuck low, mic-temp-sens1 (accessed 2026-09-26)
Hinglish me
Missing sensor mic-temp-sens1: Microphone temperature sensor 1 (i2c3 bus).
Kahan dekhein: i2c3 par devices: dock/charge port, home button, display connectors