Two keys making weird noise

[koko1738]

Hi!
my Casio digital piano px 750 making weird noises on these two keys, any suggestions how can I fix that?

Watch a9pg4c | Streamable

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video of the issue

 

[happyrat1]

Very weird.

Seems like something in the signal path is crosstalking for the 2 keys in question.

Possibly a shorted diode or capacitor in the keyboard multiplexer circuit.

This is definitely a screwdriver and soldering job.

You could contact Casio and locate an authorized service center in your area.

If it's no longer in warranty this will cost you a couple of hundred to repair.

Gary