My 1996 BMW 328i convertible still has the original stereo installed, and it DOES work, however, the LED for the controls has ceased to display anything. Wondering if there's some magically easy fix to this, or if it means replacing the stereo.
Searching found several options, but I am not sure if these are refering to the same radio you have. If you are not comfortable taking the radio apart there are repair services that will do it for you.
This site offers a DIY repair kit for the back-light if this is your radio
They also offer a repair service if that's not your radio