Default Replaced screen/digitizer, screen goes dark when making a call & earpiece is silent

So as the title says, I cracked my digitizer 2 weeks ago on vacation and finally got around to replacing it. Having done so, everything works great, all touches register, wifi/lte/texting, no problem. Had to make a phone call today and came upon the issue that the screen goes black and nothing will bring it back. My microphone works but my earpiece (speaker) does not. Once the other party hangs up, hitting the power button brings the screen up like it was sleeping.

As I've gathered from other threads, I'm going to have to tear it down again and make sure the proximity sensor is properly set up and check my cable connections for the earpiece.

Is there anything I should look for specifically while I'm back in there? Thanks all - I've only had it for a month and haven't had time to install a recovery...although I think I rooted it. Don't even remember! But first things first.