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thermalmonitord watchdog · missing sensor
Missing sensor(s): tg1b — Battery sensor TG1B
The phone restarts about every 3 minutes with userspace watchdog timeout: no successful checkins from thermalmonitord and Missing sensor(s): tg1b.Community source
Where to look: Battery
Seen with TG0B on iPhone XR: battery thermal sensors; if it persists with a known-good battery, the charger IC side (board).
Bench checks
- Test with a known-good battery; inspect the battery connector.
Sources
- iFixit Answers - iPhone XR Missing sensor(s) TG0B TG1B: battery thermal sensors (accessed 2026-10-02)
- iFixit Answers - iPhone X missing mic1 = charge port assembly (accessed 2026-09-26)
Hinglish me
Missing sensor tg1b: Battery sensor TG1B.
Kahan dekhein: Battery
Known-good battery se test karo; battery connector dekho.