Yamaha PSR 31 no sound

Hi there,

I have a Yamaha PSR-31 that was seating for awhile. It turns on, but nothing is playing.
I can hear the speakers noise when I play with the volume, but that’s about it.

What could go wrong with this thing?

Thank you

These instruments have a tendency to develop audio problems due to leaking caps on the main bd and jack bd assy where the power amp IC is located. I would use your multimeter to determine what voltages are either missing or incorrect, the caps usually short so they will be fairly easy to indentify.