lumia 800 camera problem

please can someone post camera tracks because i have one lumia 800 with camera problem. if the phone is dismantle camera workx but if i put screws and mount it back camera is not working. sometimes is black when i trie to open camera and sometimes is not even entering camera menu. i think is conection problem.


also, how can i safely remove camera without destroing it because are too many clips that hold it in place?? any tips??