Chosen Solution

Hi! Pleae help me. My Macbook does not recognize the topcase. I can start it without the topcase and work with an external keyboard but its not really a solution, because i have to start it with a screwdriver evry time i want to use it. I am sure the topcase and the cable are ok, i tested them on another macbook. Any thoughts? Is it possible to refresh the topcase-connector somehow? Thanks in advance.

If you tested your top case on another machine and it worked, try testing the working top case from the other machine on yours. What is the history of this problem? Have you had liquid damage? Inspect the logic board receptacle for foreign material or damage.