Yamaha YDP-30 7 keys on the left no sound

1

I have brought a Yamaha YDP-30 88 keys keyboard. Suddenly the last 7 keys on the left of my keyboard has no more sound. Can anyone help?

2

YDP-S30 or YDP-300 … not same thing ?!?

3

Probably a problem with corrosion on the pins. I recommend this video to replace/clean them. Replacement boards are ~$20 if you are willing to put the effort into disassembly. https://www.youtube.com/watch?v=LNu6qdyvjho&t=8s