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there is a bulb inside the backlight on the lcd display.it is 12 volt and alot of manufacturers run it from the +- 15 volt preamp power supply,on the plus rail.when the bulb burns out it can activate the dc speaker protect,or some other 12 or 15 volt circuit..if it is a flourescent display that is a different problem.those run on 5 12 18 and -32 volts.there is also a 6 volt ac filament voltage.you need the schematic.
if you dont mind a lettle customization, just go to radioshack and set your favorite color l.e.d. and wire it in, if you can find a specs diagram for your reciever, you might look up voltage and wattage of the bulb so you can get appropriate resistors for the led, and install that. itll last forever, cost virtually nothing, and its easy to do.