Thank you Philippe.
Yes I can definitely see that the OS is still appearing on the screen, its only the backlight which is failing. Additionally, after the OS loads, the unit sounds as normal.....I can play it, and turn knobs, and everything responds as it should, and sounds right. Of course I can barely see what I am doing without the backlight. Again, after unplugging and replugging the power supply a few times, the backlight will appear once again....until it fails after several uses.
How do I go about "opening a case"?