I also have a 93 Legend LS with the Bose Premium head unit. The display will randomnly dim, sometimes it would not be visibile at all. The unit would work fine, but not the display. I took the unit out and took it apart. I happen to have another front panel that was identical, and put that in. It didn't make a difference, so I assumed that it must be a circuit board inside the unit somewhere, or that the display was not getting the right amount of power. I resoldered the two main circuit boards. Some of them were hard to get to - I had to take everything completely apart. Anyway, since I did that, the display has been working much better. It hasn't dimmed yet.