In my model (model identifier: MacBookAir6,2), the camera cable connector was found located on the logic board.
When I was re-assembling, the screw hole of the heat sink didn’t align. I applied a mild force then the edge of the heat sink broke off from the rest, losing the contact to the case. I am hoping the Air would work for a while during the test run (if it ever works) but I would buy a replacement heat sink for regular use.
This has to be done very gently. I only applied a mild lift and the socket broke off from the board. I had to say good-bye to the right speaker. :-(