Backlight problems how do I fix it

My serial number has WATP and I have the backlight missing problem.

I had replaced a non working keyboard (no spills, just several keys would not work).

I love the replies, but can someone in addition to location above, tell me how they use the board number to obtain information.

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@rungunnathan - Can you go into your question (in edit mode) and finish filling in the details as well as clarify what your problem is.

Sadly you'll need to lookup your full serial number here: EveryMac to tell us what model you have. We can't use the last part like we had before to tell.