iPhone 6S rear facing camera not working

Hey guys

So I have done a full water damage repair on an Iphone 6S and it works almost perfect except for the rear facing camera, I open the app and the screen is just blank.

I tried a new camera and same issue so assume its still to do with the water damage and maybe corrosion to logic board connection with camera.

Any ideas if this can be repaired with someone with more expertise such a replacing the logic board connector etc?

On a separate note one other little flaw is it will take a screenshot or go to the slide to power off screen. again possible corrosion of power button cable or logic board connector i presume

Thanks a lot