Back cameras aren't working after LCD screen installation.

Hello all

I simply removed my broken LCD and installed a new one. It was smooth, no damage was done, but when I started my Evo, the only thing that didn't work were back cameras. The front one works, but I don't want to use my phone solely for selfies. I did hard reset, reinstalled ribbons and prayed a few times. Still the screen is black when I want to use them and after while the phone restarts.