iPhone 4 Camera not working after repair, Help!

I have a year old iPhone 4 completely operational, the LCD plug is missing 1 tiny copper prong as a result of a faulty paid repair, but everything worked fine, and I was repairing another IPhone 4 a few months ago, the camera wasn't working, i thought it might just be the camera so I swapped it out with mine and forgot to turn my iPhone off, now after that neither cameras from either of the phones worked, so I bought a new camera put it in today and the same problem, i need a camera!

someone help please!