I replaced my screen (at my own risk) but as i was reassembling the bottom right corner wouldn’t go down without pressure, now vibrate and sound dont work out the speakers also the home button, sound works through headphones and bluetooth speakers (except alarms) just no message alerts through sound whatsoever, i’ve researched all the methods and no luck, any help?
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Your description is a little confusing but this sounds like an Audio IC issue.
This can happen seemingly out of nowhere and usually follows a reboot of an affected device, like when you shut it down to repair it. Sometimes the removal of the screen gives the logic board that last “flex” that puts it over the edge. Once rebooted, the phone exhibits symptoms that were never present before.
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:
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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Thanks you that was very descriptive, the earpiece still works and i can make phone calls, its just the base speakers and the home button, i’ve rebooted and itunes looped the phone into recovery mode so i exited and now im just stuck, i was hoping it’d be an easy fix
Unfortunately, no. There are some temporary fixes, like applying pressure to the logic board but those just make the root cause worse long-term. If you want a permanent solution, then a microsoldering repair is the way to go.
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