Diagnose TrueDepth as a chain of power, telemetry, optical projection, IR capture, security state and calibration rather than replacing the first module named by a symptom.
Each stage can fail independently. A Face ID message is a symptom; the repair decision should come from the first stage that cannot be confirmed.
Use the exact iPhone generation because component layout, pairing behavior and rail names can change.
Each route keeps multiple domains open until measurement or isolation narrows the fault.
The uploaded source treats several TrueDepth components as universally paired. V2 changes this to model/iOS-dependent service behavior and requires exact-generation confirmation.
Preserve the original assembly/data when possible. Before replacement or transfer work, confirm model-specific service/calibration requirements and whether the fault is optical, electrical or security-related.
A damaged upper flex can affect proximity, ambient-light sensing, flood illumination and bus behavior. Do not assume the entire flex must be replaced from one token or boot symptom.
Power, MIPI CSI-2, connector alignment and calibration/security state can all matter. Front RGB camera operation does not prove the IR channel is healthy.
“TrueDepth camera issue” can reflect hardware, pairing/calibration, replacement history, or communication failure. Record repair history and software message before soldering.
Values are preserved as uploaded-source references, not universal Apple factory specifications.
| Module | Rail / Signal | Source Voltage | Source GR | Resistance | Bus / State | What abnormal supports |
|---|
A normal line reading only proves that checkpoint within the tested state.
V2 deliberately removes several one-to-one conclusions from the uploaded V1.
Keep projection power, optical alignment, obstruction, IR capture, calibration and software/security state open until tested.
If behavior changes with a flex disconnected, that implicates the flex/load/bus interaction but does not prove every component on that flex is defective.
A line may still have intermittent, high-speed, connector or state-dependent faults despite a normal static measurement.
Measure with loads connected/disconnected and identify the device or trace causing the clamp before removing sensors or protection parts.
Matched diode readings do not prove high-speed CSI-2 data is valid; scope/functional evidence is preferred when available.
Do not publish a single universal claim for X through 16. Record exact model, iOS/service state and replacement history.
Preserve symptom, repair history, security state, measurements and isolation results.
