Hi and welcome to JustAnswer,
Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, bear with us; re-confirm and post back with the complete model number of the piano.
Still, proposed preliminary tries (if applicable and if have not been done):
The above are the only easy user doable attempts as all other checks would be with the use of a multi-meter.
Please post back results / observations of the above once tried.
Hi again Beverly,
As posted above; please "...re-confirm and post back with the complete model number of the piano...."
And as this would now then be most likely an internal hardware issue, are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even a soldering iron?