iPhone Air — sensor array 0x3800000: Charging port flex
On the iPhone Air, 0x3800000 means: Charging port flex (USB-C) / barometric pressure sensor.
What does this code mean?
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 (decimal value 58720256). With no response, it forces a restart, which repeats roughly every 3 minutes (≈180 s) as long as the sensor stays silent.
Which part to test first?
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.
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