Generally, there is water or dirt inside or the circuit is broken by you. If you have certain knowledge of this, you can disassemble it to repair it. (Be careful, the notebook is very troublesome.) Wipe the keyboard film with a dry cloth. (Or use alcohol.) If the circuit on the film is broken, you can use a pencil to scratch the broken circuit twice (the pencil can conduct electricity) or use conductive silver paint, If water comes in, put the notebook in a dry place for a day or two.. Generally it will be OK... Of course, if you have no experience in this field, you'd better find someone with experience..
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