For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
Do you get any symbol errors in ASD? Sometimes it can be a cap between the mux & LCD connector that got knocked off that causes no vide but from what you tell me of your screen cable, you need to try a new screen.. screen and cable both.
How did this come to be? Dropped, liquid, or out of the blue?