I am having the same exact issue, but I don't think it is the pad issue or the reset issue. It was working initially and when I pulled it apart to put a bit more adhesive at the top, all of a sudden I got a grey/white screen. I thought that maybe I damaged a ribbon cable or something, but everything is still in great shape.
Is it possible something happened to the LCD itself? The silver foil (must be a shield of some kind) came off and that separated the LCD into its respective layers. Could this have hosed the LCD and touch screen and therefore is completely ruined?! Or is it possible the connector was damaged somehow or bent so that some of the pins are not making contact?
I really have no idea because I have only done this once before and it did not turn out so well.
Please any suggestions would be greatly appreciated.
Thanks!
-Jake