This one is tough because you have two strong possiblities that are unrelated to each other.
Water damage vs common audio ic fault.
We know that iPhone 7/7+ have a board level epidemic where flexion during normal use will tug or pull at the C12 pad under the audio ic causing a poor connection. This manifests in the following ways:
iPhone 7/7+ audio ic fault presentation:
1.) Greyed out voice memos
2.) Caller can't hear you on calls
3.) Siri can't hear you
4.) Various other audio/speaker/microphone-related problems
5.) Long boot time (3-5 minutes)
6.) Long boot loop (3-5 minutes) and fails update/restore with error 4013
7.) Never progresses during boot past Apple logo but is detected as normal by iTunes
All of these symptoms are proven to be associated with the audio ic c12 problem.
A lot of these symptoms are on your list of problems, however audio ic flexion fault is completely unrelated to water damage, and it is unusual for water to penetrate the audio ic area in the iPhone 7.
For water damage only, what is common is "parts problems" bad microphones, cameras, etc, as well as problems where water goes in the iPhone 7, which is:
iPhone 7 water damage hot spots:
Most common--that water never hits the board at all.
After that: Very top of phone, power/vol flex connector
And: Very bottom of phone, backlight/image area.
So what to do?
You need to do what I call "Rule #1" which is put the logic board in a known good housing and see if these problems are parts problems or not. Rule #1 is "You don't have a board problem until you KNOW you don't have a parts problem" Cross that off your list and then the next step is crisp visual exam under a microscope to see if this is likely water damage or audio ic fault.
Good luck!
Jessa of iPad Rehab
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Also should add that the volume sliders don’t even work on the phone. It’s like the speaker isn’t just not working, but the phone doesn’t recognize that there’s one there. The speaker icon in a phone call is untouchable and in the music app, the volume slider is nonexistent. The volume buttons don’t do anything and in the control center, the volume slider is inactive.
da Trevor Smith
Thanks for the response Ben. The camera ribbon cable seems to be ok although I will look to replace it to see if there’s any change. Do you know where the audio chip is on the logic board so I can maybe take a look at the damage of the chip or of the surrounding area?
da Trevor Smith