Display not working after proximity sensor replaced.

I replaced the proximity sensor on my iPhone 5s, and now the display won't come on. I've check all cables and they're seated properly.

I've used a Volt Meter to measure currency from the battery, ac adapter, and the display connector as well. All around 3.8-4.3v except for the second connector on the display. The long one. I can't seem to get more than .5v from it. (Not sure if that's it)

Nothing has happened to the screen while I've been working on it. No extreme pressure applied either. Even then, I think it would just make colors show up.

I've also tried without the sensor plugged in to make sure the replacement wasn't drawing too much current or anything for that matter.