We had this piano for twenty years, worked great, but then it started making some electric/spark sounds (through speakers) randomly while on, it got worse until it completely lost sound. Almost like the speaker's got fried.right now, it turns on, all the buttons and screen work. But there's no sound.
When it is turned on, there is a single sharp speaker pulse sound, and when you turn it off, does the same. Not sure what it is.
Pretty flexible, you can reach out to me and ask some questions.
Mahalo!