I would separate this into two issues; the screen related ones and the audio issues.
For the screen issues (HB, FCAM, Sensors), something may have gone wrong during the repair or this may be caused by a bad replacement screen. I would install the original screen to see if the problem remains or goes away. If the problem is persistent, then I would check the condition of the connectors and inspect the surrounding area for signs of missing or partially dislodged components.
As for the other audio related issues, they could be caused by the Audio IC on the logic board. 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). 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. Once rebooted, the phone exhibits symptoms that were never present before.
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 out
- Siri doesn’t hear you / Caller can’t hear you
- Most other Audio related issues that aren’t solved by modular replacements
- Long boot times (3-5 minutes)
- iTunes detects the phone but stuck on the Apple Logo
Hopefully you can find the solution to your screen issues (bad screen or installation). If the audio related issues don’t get resolved then you may need to have your phone looked at by an experienced micro-solderer.
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