Yamaha Clavinova CVP 505

Hi.please help me with my issue
Yamaha Clavinova cvp 505.no sound on keyboard.
The lights are working but no sound of keys we hear when pressing on them.

Try playing the CVP-505 from another keyboard via MIDI. If you get sound then, you know that the keybed is the problem. (Or play a demo sequence, if it has one. It should play even if the keybed is faulty.)