Phone boot loops after screen replacement except after DFU restore

So I got an iPhone 7 in the mail that had a completely destroyed screen. Powered it on and briefly saw some text on the LCD where it wasn’t destroyed, so the phone obviously is useable it just needed a new screen. The item description said that there was also no working microphone so I think that the bottom flex cable with the lighting port under the speaker must be replaced as well. I replace the screen and upon doing so I power on the device to only be stalled by the Apple logo. Disappointed, I DFU the phone and was able to successfully get into the phone as normal.

The only problem though, is that when I power it off and power it back on, I get stuck on the Apple logo boot loop! I’m completely amazed that I’d end up having to keep this phone powered on as much as possible, which is stupid; I shouldn’t have to do this, but it’s necessary so I don’t have to reset the device AGAIN which takes about 30 minutes.

I narrowed it down to a couple of options: Will I need to check my front camera flex cable module for the proximity sensor to make sure it’s correctly in place? I read briefly that the on board audio chip would also cause bootloop, might also be why microphone and speaker doesn’t work.

I guess I’m in for a micro soldering job?