After examining the socket with a magnifying glass, I realized there were only 5 pins in the socket. I worried I had broken a pin off and was screwed, but after taking pictures on my phone I was able to see the 6th pin was actually bent all the way back and shorting with the 5th pin. I'm guessing this happened from trying to push the 1st replacement in at an angle. The socket was too small to get my smallest tweezers in, but after a long time fiddling around with a sewing needle, I was able to pull that pin back out and straighten it. That ended up doing the trick and now everything is working perfectly.

Taking the logic board out was definitely more time consuming, but it allowed me to clean everything thoroughly, and made installing the DC-In board trivial. I'd personally recommend just doing that, but if you're going to take the shortcut just be very careful and don't force anything. The angle you have to take poses a risk for bending pins—at least on the mid-2015, other years may be slightly different.

This is definitely doable and has obviously worked for a few people here, but unfortunately it caused me some problems (on a mid-2015). Just sharing my experience so hopefully others can avoid the same mistakes.

So I followed steps 1–4, 28, then 33 and got the old DC-in board out pretty easily. Getting the new one in, as others have noted, is much tricker without removing the logic board. There's not much space behind the socket to line up the connector, so you have to kind of go in at an angle. After ~20 minutes of fiddling I eventually got it in. But after plugging everything back in, I still wasn't able to charge or get a green/orange light on my charging cable.

I ordered a new DC-in board, hoping I just got a dud. This time I removed the entire logic board and noticed the DC-in connector wasn't actually pushed all the way in on the left side. I thought I may have damaged the original connector trying to push it in with tweezers, but then my new DC-in board also wasn't plugging into the socket evenly.

Mid-2015 they lift up