how to repair keyboard keys not working laptop

how to repair keyboard keys not working on laptop?
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I've tried to fix my friend's keyboard laptop with simple troubleshooting. And it's work until now.
As you see on this tutorial, it should be easy to fix your keyboard's problem.
BUT.. be careful when you take off the key, the plastic inside there is so fragile..
software that I used to check keyboard.
drive.google.c...
#sorry my English isn't good.
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