Common Symptoms of a Failing 338S00105 IC
This chip is infamous for causing “Loop Disease” on the iPhone 7 series, a structural defect where a critical pad beneath the chip disconnects from the motherboard due to minor chassis bending. Common indicators include:
- Grayed-out Voice Memos: The record button cannot be tapped.
- Grayed-out Speakerphone: The speaker icon turns gray and is unselectable during phone calls.
- Extremely Long Boot Times: The phone hangs on the Apple logo for up to several minutes before booting up.
- Microphone Disabling: Siri cannot hear you, and voice recording in third-party apps does not function.
- No Sound: Complete loss of audio output through headphones or built-in speakers.
Technical & Repair Specifications
- Pin Count: 40-pin BGA (Ball Grid Array) chipset.
- Function: Encodes and decodes digital audio data into analog sound and vice versa.
- Standard Fix: The permanent solution is micro-soldering, which involves desoldering the chip from the board, installing a micro-wire jumper to reinforce the fractured pad connection line (usually the C12 pad line), and resoldering (reballing) the IC back into place.
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