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.
There is no reason to search for backlight, if no image present.
But should confirm if you get USB activity at least; or no reason to search for image too.
Check on both USB ports...