Key Technical Specifications
- Part Number: 610A3B / 1610A3B
- Designation: Tristar / U2 USB Logic IC
- Pins / Package: 36-Pin BGA (Ball Grid Array)
- Compatibility: Primarily iPhone 7 / 7 Plus, but also backwards-compatible with certain older iPad models
Common Failure Symptoms
When this specific chip degrades or shorts out (frequently caused by low-quality third-party charging cables or car adapters), the phone will display distinct power anomalies:
- Fake Charging: The battery lightning bolt icon appears, but the actual percentage never rises.
- No USB Detection: The device fails to sync with iTunes or respond entirely when connected to a computer.
- Rapid Battery Drain: The motherboard experiences a parasitic draw, discharging a fully healthy battery within hours even when idle.
- Dead Phone (No Boot): The device remains completely unresponsive and draws zero or erratic current on a USB power meter.
Replacement & Repair Details
Replacing this component requires professional micro-soldering tools due to its fragile BGA structure. Technicians must use a hot-air rework station to desolder the faulty chip from the motherboard, clean the residual pads, and solder down a fresh pre-balled replacement IC.
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