MH TECH PROFESSIONAL GUIDE
iPhone Fault Ampere Sequence
Professional DC Power Supply current reading reference for iPhone motherboard diagnostics.
Identify boot stages, short circuits, NAND faults, PMIC issues, and boot loops using ampere sequence analysis.
0.000A Reading
Indicates no boot condition. Possible VDD_MAIN short, PMIC enable issue, or battery communication fault.
0.020A Stuck
Commonly related to Tristar, PMIC initialization, CPU enable sequence, or charging IC problems.
0.480A Stuck
Usually caused by NAND communication failure or corrupted data loading sequence during boot.
0.700A Reboot
Indicates boot loop, sensor panic, thermal panic, Face ID line issue, or peripheral communication failure.
Fault Ampere Sequence Table
| Amp Reading | Status / Possible Fault |
|---|---|
| 0.000A | No boot, PMIC enable issue, battery line fault |
| 0.010A - 0.050A | Tristar, charging IC, battery communication issue |
| 0.060A - 0.090A | CPU initialization failure, NAND issue |
| 0.100A - 0.150A | Boot starts but stops, PMIC/RAM communication fault |
| 0.160A - 0.250A | Recovery / DFU mode stuck |
| 0.300A - 0.500A | Partial boot, display disconnected possible |
| 0.600A - 0.900A | Normal full boot stage |
| 1.000A+ | Heavy short circuit or overheating component |
| 0A → High → 0A | Boot loop, NAND/CPU/sensor issue |
Normal Boot Sequence
0.000A
↓
0.020A
↓
0.080A
↓
0.150A
↓
0.300A
↓
0.700A+
Basic Fault Flow
0A
├── Short? → VDD_MAIN
└── No Short
├── 0.02A → PMIC / Tristar
├── 0.08A → CPU Init
├── 0.15A → NAND / RAM
├── 0.48A → Data Load Fail
└── 0.7A Reboot → Peripheral Panic