Idle high → press low
Source reference: approximately 1.8 V idle and 0 V when pressed. Confirm flex switch, connector, pull-up and PMU-side line separately.
IPHONE SENSORS / BUTTONS / HAPTICS FORENSICS
Trigger the input.
Trigger the input.
Then prove the sensor path.
Separate always-on power, sensor buses, physical keys, Taptic Engine drive, motion sensors, proximity/ALS, barometer and watchdog telemetry before replacing a flex, sensor IC or haptic driver.
PERIPHERAL SENSOR EVIDENCE CHAIN
POWER
LDO
BUS
TRIGGER
SENSOR
WATCHDOG
A dead button, frozen orientation or 180-second restart is a symptom family. The correct repair follows the first electrical, bus or telemetry stage that cannot be confirmed.
01 — SENSOR & BUTTON ACTIVATION HIGHWAY
Trace seven stages from always-on power to watchdog state
Select the subsystem first because buttons, haptics, motion and environmental sensors use different rails and buses.
02 — SYMPTOM-TO-PROOF ENGINE
Buttons, haptics, motion, proximity and watchdog faults
Each case keeps the flex, connector, rail, bus and IC domains open until bench evidence narrows them.
SELECTED FAILURE
Observed evidence
Competing domains
Proof required
03 — PHYSICAL KEY / HAPTIC MATRIX
Separate mechanical switch, logic line and feedback
Button input and haptic confirmation are separate electrical paths.
04 — SENSOR WATCHDOG / PANIC TOKEN MAP
Token → exact model → physical domain → confirmation
Do not map a token directly to one flex or IC across every iPhone generation.
| Token / Symptom | Source Domain | Possible Physical Domain | Required Confirmation | Do Not Assume |
|---|---|---|---|---|
| prs0 | Pressure / barometer telemetry | Barometer, flex/connector, I²C line, board trace | Exact model mapping + full panic + I²C/power test | Do not automatically replace the charging/dock flex |
| Proximity fails during call | Prox / ALS / optical path | Optical window, flex, 3V rail, I²C, sensor alignment | Functional test + rail + bus + known-good assembly | Do not assume sensor IC is bad |
| Auto-rotate frozen | IMU / motion | IMU power, SPI/I²C, sensor, AP-side bus, software state | Known-good software state + power + bus evidence | Do not jump directly to IMU BGA reball |
| 180s restart | Watchdog / missing telemetry | Depends on token and model | Full panic log + exact model + functional isolation | Do not treat “3-minute reboot” as one universal flex fault |
05 — SENSOR / BUTTON REFERENCE DATABASE
Voltage + GR + resistance + signal type
Values are retained as uploaded-source references. Exact-model schematic/boardview and known-good measurements take priority.
| Subsystem | Rail / Signal | Source Voltage | Source GR | Resistance | Signal / State | What abnormal supports |
|---|
06 — LIVE SENSOR-LINE EVALUATOR
Combine static measurement with functional state
A passing line reading does not prove active bus traffic, sensor calibration or mechanical input integrity.
07 — SOURCE RULES CORRECTED
Do not turn a sensor clue into automatic IC rework
V2 deliberately removes several one-to-one conclusions from the uploaded V1.
PMIC is not “100% proven”
It only proves the board can boot through that path. The original key/flex/connector line is still the primary branch, but PMU-side issues are not mathematically excluded.
Not automatically torn BGA pads
An open can be filter/series part, trace, pad, connector or IC-side. Locate the actual discontinuity first.
Not automatically boost coil / driver IC
Start with known-good engine, connector, boost rail, differential output and command state.
Not automatically ear flex
Optical obstruction, alignment, display glass, rail, I²C and sensor/flex faults can produce the same call symptom.
Model-specific mapping required
`prs0`, `mic1` and other tokens are domain clues; physical placement and repair route can vary by generation.
Does not prove active sensor integrity
SPI/I²C timing, interrupt behavior, calibration, intermittent solder and mechanical faults can pass static GR/voltage tests.
08 — SENSOR / BUTTON CASE DOSSIER
Record trigger, telemetry and isolation evidence
Preserve exact model, panic token, button waveform, flex substitution and sensor behavior.