Originally Posted by Chris B.
Well, look, if you're patient and careful you can disassemble the head unit yourself and see if you find a replaceable bulb in there. If it'* an LCD type of display that'* edge-lit by light bulbs (which sounds like it from what you describe), then you just need to get at the light bulb and hope it'* replaceable. (i.e. Worst-case scenario is that it'* soldered in, in which case you need to get out your soldering iron, and get a replacement bulb from Radio Shack...)