Clyde

I have a 2000 Royal Star Venture. The lights in the speedometer have quit working. The display still works and all the fuses have been checked. I believe it is something on the the circuit board that has burned out. Not sure how to go about diagnosing the culprit. Was wondering if anybody else has had this problem that has a fix. Do not really want to spend $1000.00 on a new speedometer unit.