To answer your unasked question,”How can I make it stop?” :Isolate it with a stick. Put one end on your ear, the other on various components that may be the sou

To answer your unasked question,”How can I make it stop?” :Isolate it with a stick. Put one end on your ear, the other on various components that may be the source of your tone. When you have isolated the component, glue it down to dampen the electromechanical vibrations. Unless it’s the power supply. Don’t glue that down.