Yamaha Clavinova CVP 505

Synth Repair
1

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.

2

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.)