11-20-2017 12:56 PM
Welcome to the Community Forums.
Would you have the machine number to be specific on your model?
This same condition would reflect the motherboard that usually holds the socket for backlighting on the keyboard which will not be available if your model is intended to have no backlit on setup. Replacement systemboards with backlit connector would appear an expensive option.
You can check on your machine for the backlit keyboard connector if available as shown below.
Hardware manual here.
Hope this help answer your query.