iPhone 14 Plus Panic Full - SMC BSC failure 0x500000

Device: iPhone 14 Plus (iPhone14,8 / Board Target d28)

SoC: A15 Bionic (8110 Rev 11)

iOS Version: 17.4.1 (21E236) / Darwin Kernel 23.4.0

Symptom: Device automatically restarts every 3 minutes in a continuous reboot loop.

Hi iFixit community,

I am troubleshooting an iPhone 14 Plus that triggers a panic-full reboot every 180 seconds. Below is the raw header and panic log extracted from the device:

JSON

{"bug_type":"210","timestamp":"2025-12-19 16:19:54.00 +0300","os_version":"iPhone OS 17.4.1 (21E236)","roots_installed":0,"incident_id":"C00608FF-EE45-4DA6-AE23-78756C421FD2"}
{
  "build" : "iPhone OS 17.4.1 (21E236)",
  "producto" : "iPhone14,8",
  "socId" : "8110",
  "socRevision" : "11",
  "incidente" : "C00608FF-EE45-4DA6-AE23-78756C421FD2",
  "crashReporterKey" : "5fba0fd7ae4562577b1c858df0f36b596b49d9dc",
  "kernel" : "Versión del kernel de Darwin 23.4.0: vie. mar. 8 23:31:19 PST 2024; root:xnu-10063.102.14~67/RELEASE_ARM64_T8110",
  "fecha" : "2025-12-19 16:19:54.81 +0300",
  "panicString" : "panic(cpu 2 caller 0xffffffff03adadde8): SMC PANIC - ASSERTION FAILED: target/d28/target.cpp:266: 0, SMC BSC failure, spreadsheet ver(*10) 40\nS.sensor array 0 - 4 is 0x0, 0x500000, 0x0, 0x0, 0x0 \nF.sensor array 0 is 0x0\n\n - Misc(2) OUTBOX1 not ready\nASSERTION FAILED: target/d28/target.cpp:266: 0, SMC BSC failure, spreadsheet ver(*10) 40\nS.sensor array 0 - 4 is 0x0, 0x500000, 0x0, 0x0, 0x0 \nel array del sensor F.sensor 0 es 0x0\n\nRTKit: RTKit-2419.102.1.release - Cliente: AppleSMCFirmware-4283.102.1.d28.REL\n!UUID: e1e60d6f-ffea-3505-b762-230396fe6490\nTiempo: 0x00000003c6e25e67\n\n"
}

Technical Analysis:

• Hardware Identification: Model identifier iPhone14,8 and target d28 both confirm this is an iPhone 14 Plus.
• Sensor Array Error Code: S.sensor array explicitly flags value 0x500000 (which corresponds to 5242880 in decimal).
• Bus Failure: On the iPhone 14 Plus architecture, 0x500000 is the combined bitmask representing the Dock Flex / Charging Port thermal sensor array (0x100000) combined with the Wireless Charging / Back Glass sensor line (0x400000).
• SMC Assert: The System Management Controller fails communication over the BSC (Bus Status Controller) due to missing SMBus/I2C thermal readings from TAOP/TAOJ.

Local shops suggested a battery replacement, but the panic log contains no battery gauge failures (TG0B, TG0V, or Gas Gauge).

Questions for the community:

1. Has anyone resolved this exact 0x500000 / SMC BSC failure on an iPhone 14 Plus strictly by replacing the Dock Charging Port Flex Cable with an OEM pulled part?
2. Does a missing/damaged Wireless Charging Coil flex connector trigger this entire 0x500000 bitmask on its own, or is the Dock Flex always the primary culprit?
3. If a new OEM Dock Flex does not resolve the panic, which diode readings / filter components near connector J6400 should be checked?

Thank you!