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thermalmonitord watchdog · missing sensor
Missing sensor(s): tb0t — Battery sensor TB0T (SMC panic, battery temperature)
The phone restarts about every 3 minutes with userspace watchdog timeout: no successful checkins from thermalmonitord and Missing sensor(s): tb0t.Single source
Where to look: Battery · Battery connector / data line
Reported on iPhone 14 Pro Max together with TB0V; the sensor-array word 0 read 0x41 (battery data) on that board.
Bench checks
- Test with a known-good battery (a non-genuine battery shows a service message).
- Inspect the battery connector, especially after screen or battery work.
Sources
- iFixit Answers - iPhone 14 Pro Max SMC panic TB0T TB0V (accessed 2026-09-28)
- iFixit - iPhone SMC Panic Assert (accessed 2026-09-26)
Hinglish me
Missing sensor tb0t: Battery sensor TB0T (SMC panic, battery temperature).
Kahan dekhein: Battery · Battery connector / data line
Known-good battery laga ke test karo (non-genuine battery par service message aata hai).
Battery connector check karo, khaaskar screen ya battery ka kaam hone ke baad.