The iPhone 7 Plus has a known weakness in its audio IC. When a customer reports no sound during calls, the repair path ranges from a $5 ear speaker to a $200 microsoldering job. Knowing which one it is before quoting protects both your margin and your reputation.
First, separate the symptoms
| Test | Result | Meaning |
|---|---|---|
| Play music on loud speaker | Works | Loud speaker and main audio path OK |
| Record a voice memo | Works | Bottom mic and charging port flex OK |
| Hold phone to ear on a call | No sound | Ear speaker or front flex |
| Caller cannot hear customer | Mic path issue | Charging port flex or audio IC |
Ear speaker vs audio IC
If loud speaker and voice memo both work, the ear speaker assembly is the prime suspect. Replace the ear speaker + proximity flex first. If the symptom persists after a known-good replacement, the audio IC on the logic board is likely the cause — this is the classic "loop disease" audio IC fault on the iPhone 7 family.
Board-level audio IC symptoms
- Voice memos record but sound slow or distorted
- Callers report garbled voice
- Phone takes longer than usual to boot
- Bluetooth audio works, but built-in mics and speakers do not
These patterns point to the audio IC and require microsoldering. Refer the job to a board-level specialist rather than replacing more parts.
FAQ
Can I test the ear speaker without opening the phone? Not reliably. A software speaker test app can help, but physical inspection is definitive.
Is audio IC failure common on all iPhone 7 models? Yes, both 7 and 7 Plus are affected. It is one of the most common board-level faults on those models.