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Device loudspeaker not working on calls, but works for everything else

Good Day,

I have an iPhone 7 where it’s in full working order aside from the loudspeaker feature on a call. When tapping speaker, it magnifies the volume of the ear speaker, but no volume comes out of the loudspeaker. The loud speaker will work fine on youtube, siri etc. I have also noticed the loudspeaker doesn’t working in sound and haptics.

I have tried restoring and updating in dfu mode connected to itunes to no success. We buy and sell phones, and im beginning to see this issue more frequently on the 7/7 plus model. I have tried a new genuine loud speaker, and charging port from a working phone and it didn’t help.

Many thanks.

K.M

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The iPhone 7 series of devices have proven to be very unreliable, suffering from flex-based issues similar to the iPhone 6 Plus (Touch Disease). On the iPhone 7, the fault line runs along the top of the SIM card reader and affects the Baseband CPU and Audio IC. Any short copper traces running perpendicular to the fault line while connecting to micro-BGA pads, is subject to failing.

On the Audio IC, this particularly affects the C12 pad/trace although there are 4 pads/traces along the fault line. Of those four, the C12 pad (I2S_AP_TO_CODEC_MCLK) is the most critical as it is a communication protocol line between the CPU and the Audio IC. ''''

Here are the typical symptoms, as collated by the repair community:

  1. Voice Memos app / Loudspeaker on call - greyed out
  2. Siri doesn’t hear you / Caller can’t hear you
  3. Most other Audio related issues that aren’t solved by modular replacements
  4. Long boot times (3-5 minutes)
  5. iTunes detects the phone but stuck on the Apple Logo

This is a repairable problem but it requires a micro-soldering repair. Although it can be a routine repair for an experienced tech, it can go sideways very quickly as the Audio IC is directly opposite the underfilled Baseband CPU.

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