0x100000 — SMC: silent sensor
SMC “BSC failure” panic: the system management controller (built into the SoC) periodically waits for a response from each mandatory sensor; here, the charging port flex sensor has stopped responding. With no response, it forces a restart, which repeats roughly every 3 minutes (≈180 s) as long as the sensor stays silent. Reproduced on iPhone 14 Plus by disconnecting the USB module (DFRWS 2025).
On iPhone 14 Plus, iPhone 14
Charging port flex (Lightning)
SMC “BSC failure” panic: the system management controller (built into the SoC) periodically waits for a response from each mandatory sensor; here, the charging port flex sensor has stopped responding. With no response, it forces a restart, which repeats roughly every 3 minutes (≈180 s) as long as the sensor stays silent. Reproduced on iPhone 14 Plus by disconnecting the USB module (DFRWS 2025).
First check
Check the seating and condition of the charging port flex (tears, corrosion, FPC connector pins), then test with a known-good genuine flex; if the panic persists, measure the connector pins on the logic board in diode mode.
On iPhone 14 Pro Max, iPhone 14 Pro
Power button flex
SMC “BSC failure” panic: the system management controller (built into the SoC) periodically waits for a response from each mandatory sensor; here, the power button flex sensor has stopped responding. With no response, it forces a restart, which repeats roughly every 3 minutes (≈180 s) as long as the sensor stays silent.
First check
Inspect the power button flex (pry marks near the connector, tears), test with a known-good flex, then diode mode on the connector.
On iPhone 15 Plus, iPhone 15
Front sensors flex (proximity)
SMC “BSC failure” panic: the system management controller (built into the SoC) periodically waits for a response from each mandatory sensor; here, the proximity sensor on the front flex has stopped responding. With no response, it forces a restart, which repeats roughly every 3 minutes (≈180 s) as long as the sensor stays silent.
First check
Inspect the front sensors flex (proximity / ambient light) and its connector, then connect a known-good flex to see if the restarts stop; diode mode on the connector if in doubt.
On iPhone 15 Pro Max, iPhone 15 Pro
Charging port flex (USB-C)
SMC “BSC failure” panic: the system management controller (built into the SoC) periodically waits for a response from each mandatory sensor; here, the charging port flex sensor has stopped responding. With no response, it forces a restart, which repeats roughly every 3 minutes (≈180 s) as long as the sensor stays silent. Value recorded in the lab by disconnecting only the USB module (DFRWS 2025).
First check
Check the seating and condition of the charging port flex (tears, corrosion, FPC connector pins), then test with a known-good genuine flex; if the panic persists, measure the connector pins on the logic board in diode mode.
On iPhone 16 Pro Max, iPhone 16 Pro
Charging port flex (USB-C)
SMC “BSC failure” panic: the system management controller (built into the SoC) periodically waits for a response from each mandatory sensor; an iFixit Answers reply links 0x100000 (1048576) to the charging port and extends it to the 16 and 17 series, with no confirmed case. With no response, it forces a restart, which repeats roughly every 3 minutes (≈180 s) as long as the sensor stays silent.
First check
Check the seating and condition of the charging port flex (tears, corrosion, FPC connector pins), then test with a known-good genuine flex; if the panic persists, measure the connector pins on the logic board in diode mode.
Sources
- iFixit – iPhone SMC Panic Assertion Failed (tableau « Sensor Reference ») ↗
- Song, Yang, Lee et al. – A study on the recovery of damaged iPhone hardware exhibiting panic full phenomena, DFRWS APAC 2025 / FSI: Digital Investigation 54 (2025) 301980 – Tableau 5 (débranchement de modules) ↗
- Repair Wiki – How To Fix an iPhone 14 That Randomly Restarts (copie Wayback Machine 2026-03-02) ↗