Front and Rear Camera does not work after screen replacement

Hello,

Recently I have replaced iPhone 6 screen. The problem I have now is that Rear and the Back camera does not work, flash-light as well. It looks like everything else apart these works fine. Then I turn on them, they are just completely black. I tried those cameras on other iPhone 6 and they did work. I tried to erase the content of iPhone but it did not help. Right now I am giving a try on DFU mode and will update what is happening. Somehow I believe that I occidentally shortened with static charge. Anyone else any thoughts on this?

Thank you for your help.