It's hard to tell from the pictures but the lens cover is actually 2 pieces. There is a metal piece that the actual glass fits into but you can only see the outside edge of it. So if you accidentally break the glass camera cover like I did and order a replacement piece, they are probably only going to send you the glass. You'll have to use something sharp to scrape the broken glass and adhesive off of the metal piece and then use new adhesive to stick the glass to the metal piece. Then you can insert the little LED cover and stick this assembly to the the back of the phone.
This reveals a circuit path which is connected by the metal shield sitting on it in multiple areas. I was wondering just how good the contact was so I cut 2 square pieces of rubber, about 1/2 in. x 1/2 in. each, from a bicycle tube and placed them on top of the metal shield on either side of the Snapdragon chip so that they would put downward pressure on it when the circuit board was screwed down again. I reassembled the phone and now the display seems to be working fine. It doesn't flicker or fade even when I flex the screen.
I tried the paper on the connector trick and it worked for a few days but then the screen flicker and fading to black came back. I noticed that when I flexed the phone's screen by holding it at its corners the problem would get better one way and worse the other. I thought maybe there was something wrong with the display so I ordered a new display w/frame assembly since they aren't too expensive for this phone model. This did not fix the screen flickering/fading, however, at least I was able to rule it out as the cause. Since I had already disconnected and reconnected all of the connectors multiple times I thought maybe there was something physically wrong with the circuit board itself like a crack. While looking over the board thoroughly with a flashlight I noticed that the thin metal shield that surrounds the Snapdragon chip(shown in the picture in step 2) can be removed by gently prying upward on the edges with a precision flathead screwdriver. Continued->