I have a Verizon iPhone 4 that I cracked the front screen on. So I followed the iFixit guide with front glass and digitizer parts from some eBay seller. Replacing the screen wasn't that hard, but now the screen has a flicker to it, especially when the brightness is turned up. I suspect this is just because of the cheap $20 screen I bought. Anyone out there that has done this replacement on a Verizon iPhone 4 without these issues? If so where did you buy the parts from?