Most of these are because the keyboard has failed or the connector is loose. It may work again if you reconnect the keyboard internally, but it’s generally due to a matrix failure.
In your case, you picked the wrong system :-). The 15-e has a modular keyboard, which isn’t the case on the 15-p series. Refer to the Service manual to replace the keyboard and get the part number that matches the country you are in. The US part numbers are 719853-001 or 720597-001.
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