CD-i member Samson7point1 published his experiments on CD-i in a nice article, recommended if you like to learn more about fixing your CD-i timekeeper chip, installing the RGB mod of just greasing the wheel and tray of the CD drive. He also gives a look at repairing his CD-i thumbstick. Another blog to keep in your mind with interesting articles, sometimes CD-i related.
[Thanks, Samson7point1]