so I just soldered my new U8400, nothing has changed.
So I removed this U8400 and Q8400 and soldered it to a working macbook ,Backligth is here, its woking perfectly, so we can be sure, U8400 and Q8400 is fine.
But my Problem now, its that I can´t get Picture, I don´t talk now about Backligth, my First Problem was No Backligth, but now, I don´t get Picture. ( look a Video