Keyboard buttons won't work

Hi

I don’t usually work in Yamahas but I have worked on lots of Roland machines and when the controls and button stop working but the keys work that tends to mean that the daughter board on the top half of the keyboard has a issue

I can’t say exactly what the issue is as it can’t vary from machine to machine but it should be obvious(I would look for blown components damage and corrosion),if you can’t see anything on the boards you can use this guide(linked below)if you would like:-)

Adding images to an existing question

Hopefully this helps

Any questions please ask

Thanks:-)