iPhone X — mic1: Charging port flex
Medium confidenceVerified sourceMissing sensor
On the iPhone X, mic1 means: Charging port flex (bottom microphone).
What does this code mean?
Watchdog panic: thermalmonitord no longer receives a response from the bottom microphone mic1, mounted on the charging port flex; with no response for ~3 minutes, iOS restarts the iPhone.
Which part to test first?
Test with a known-good genuine charging port flex; inspect the resistors around the connector; if the panic persists, test with a known-good frame.
The same code on other models
- iPhone 12 Pro MaxCharging port flex
- iPhone 12 ProCharging port flex
- iPhone 12 miniCharging port flex
- iPhone 12Charging port flex
- iPhone 11 Pro MaxCharging port flex
- iPhone 11 ProCharging port flex
- iPhone 11Charging port flex
- iPhone XS MaxCharging port flex
- iPhone XSCharging port flex
- iPhone XRCharging port flex
- iPhone SE (2nd generation)Charging port flex
- iPhone 8 PlusCharging port flex
- iPhone 8Charging port flex
- iPhone 7 PlusCharging port flex
- iPhone 7Charging port flex
Field cases
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Sources
- Repair Wiki – How To Fix an iPhone X That Randomly Restarts (Wayback Machine copy 2026-02-19) ↗
- iFixit – iPhone Kernel Panics (“Watchdog Timeout Thermalmonitord Missing Sensor” table) ↗
- iFixit Answers 711179 – Reboot every 3 minutes – Charging Port Flex? (iPhone X, mic1) ↗
- iFixit Answers 713316 – iPhone Rebooting every 3 minutes (Mic 1/Thermalsensor) (iPhone X) ↗