I have a similar problem, I replaced the keyboard, I still have the same A, B, N, and enter key not working. I believe the motherboard is bad. I fixed the problem by using a USB keyboard.
You may need to replace it. I believe I answered you on how to remove it with your other questions, however, before you go replacing the board, make sure that the ribbon cable that connects it to the motherboard is properly connected and has no visible damage.
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