I have worked on some of my keyboards. Not as a professional put just as a player with some electronic experience. I have repaired the power supply in my Motif ES. I also replaced the display in a Roland G70.

If you take your time. Label the connections so you know where they go when you reconnect everything, you should be fine. Taking a lot of pictures helps. I use scotch tape and when I pull a connector out I assign it a number, putting that number on the connector and the place it plugs into.

Looking at your picture you appear to be quite intelligent. (he he) You should have no problem. The very best of luck to you.