Hi,
I had this issue and replaced the front camera flex and it worked fine.
After close inspection I found that the LDR (I am guessing that is what it is), that comes across and sits below the screw mount for the long screw, was damaged. It was clearly sitting wrong and when the long screw was driven into the mount, the component has sustained damage.
This worked well, I assume it isnt a universal fix, but it may be a fix for some folks out there!
Cheers,
Calvino @ Esperto Group