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.
You can't. Simple substitution confirmed already that your LCD is bad. You could try and swap the LCD cable, but anything past that is not worth the effort in my eyes and the assembly should be replaced.