I have a Droid 4 that the touchscreen has begun to act up on. I've have in my hand a new flex cable for the phone, but upon taking the phone apart I've noticed 2 connections that have black tape around them. One is going to the front camera, and the other one goes to the screen. (at least I think it's for the screen) How are these connections made? Are they soldered? Is the flex cable even replaceable? Thanks!