0x300000 — 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, two sensors are missing: charging port (0x100000) and proximity (0x200000). With no response, it forces a restart, which repeats roughly every 3 minutes (≈180 s) as long as the sensor stays silent.
On iPhone 14 Plus, iPhone 14
Charging port flex + proximity sensor
SMC “BSC failure” panic: the system management controller (built into the SoC) periodically waits for a response from each mandatory sensor; here, two sensors are missing: charging port (0x100000) and proximity (0x200000). 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/test both flexes (charging port and front sensors) with known-good parts.
On iPhone 15 Pro Max, iPhone 15 Pro
Charging port flex (USB-C) — possibly together with the front sensors flex
SMC “BSC failure” panic: the system management controller (built into the SoC) periodically waits for a response from each mandatory sensor; iFixit, Repair Wiki and iPad Rehab attribute this value to the charging port; in the lab, DFRWS gets it by disconnecting the charging port AND the proximity sensor (0x100000 + 0x200000). 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.
On iPhone 16 Pro Max, iPhone 16 Pro
Charging port flex (USB-C) / barometric pressure sensor
SMC “BSC failure” panic: the system management controller (built into the SoC) periodically waits for a response from each mandatory sensor; here, the sensor in the charging port assembly has stopped responding (value shown in decimal: 3145728). 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.