Why does my Casio CT-636 make a loud noise when plugged in?

What's wrong with my Casio CT-636? When I turn it on, it makes a loud noise. If I plug in external speakers, the noise comes out of the external speakers. Here's a link to what it sounds like.

https://www.youtube.com/watch?v=urQ8OZ03...

Answer this question I have this problem too

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