Ok guys I had the same problem with a hot pink after replacing a new lcd on a 4s phone.The phone will not function at all no backlight at all.So I decide to try other just encase still the same result..The screens faulted out my 4s main board,so I decide to disconnect everything and leave it out for a few minutes so I can flush all the power form the main board.As I tried the second screen it work,but as I notice that there were more oil residue on the gold connector pins which connect to the main board.This maybe be the cause or the bad screen.