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It has an external power supply (wall wart) that does not have a 3-prong plug with ground. Instead, it's a very noisy medium-pitch buzzing sound accompanied with crackling. Also, even with the keyboard volume off, the sound can still be heard. The buzzing noise can be heard whether it is connected to a portable Roland KC500 keyboard combo amp at home or the church sound system through a DI with ground lift or not. It has worked fine for years with no problem until now. Hi, I have a Yamaha digital stage piano that all of a sudden started having a buzzing, crackling sound coming from it.
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