How do I reattach the LCD display data cable after disconnecting it?

Yes it's a little tricky to connect this cable and even if I work a lot on this A1342 model I must always pay attention to this connection step. The socket is very fragile and the connector must have exactly the right alignment before being inserted in the socket. What I do is putting on my frontal lamp to have a good area lightning then I use a magnifier in my left to have a close view of the socket. I then grab the connector by the steel retainer clip and align it with the socket but with a small angle (rear of the connector up and front down) then I apply a little force to see if it will enter in place. If not I redo the alignment and try again. The idea is not applying to much force to the connector when trying to insert it. Patience...that's all it takes. Good luck !!