Chosen Solution
I can’t hear my phone calls unless I put it on speaker
I know this is an old question but if audio related problems are not resolved by software or modular repairs, then read on… 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: Voice Memos app / Loudspeaker on call - greyed outSiri doesn’t hear you / Caller can’t hear youMost other Audio related issues that aren’t solved by modular replacementsLong boot times (3-5 minutes)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. An unqualified tech can apply too much heat and cause massive problems. So do your due diligence.
Hello Mahin, There are multiple ways to fix this issue. First, have you tried restarting your iPhone? Don’t just power it off, but hold the power button and lower volume rocker until the screen turns black and shows an apple logo. If this doesn’t work, make sure your iPhone is up to date on the most recent update. Lastly, if neither of those work, it most likely is just broken and needs to be fixed. You can either fix it yourself by replacing the ear speaker or taking it into a repair shop and having them do it. Just a FYI, if you do attempt to repair it yourself and break your phone, I am not liable. Hope this helps!
Check my “Audio issues (headphones/ear speaker) on iPhone 7 and iPhone 7 Plus.” post.
