Component: Power Management IC (big power IC) – 343S00511
Function: Controls charging current, voltage distribution to CPU, and power protection mechanisms
Compatibility: iPhone 13 Pro & 13 Pro Max
Use Cases:
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No power-on despite battery with charge
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Very slow or no charging, “Accessory not supported” messages
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Random shutdowns or overheating during charging
Quality: OEM-grade or premium aftermarket part, must be replaced via board-level micro-soldering