Some of possibilities are:
a) a burnt out LED (light emmiting diode) inside the display (could be tricky or difficult to change it) or a faulty LED power supply line
b) if the light source is an electroluminescent panel, possibly the panel itself or the power supply is faulty (electroluminescent panels use an elevated voltage power supply which is in the shape of a small box somewhere inside the housing, with two wires going to the panel - it is also possible that the power supply is not in the form of a box but is in fact an integral part of the circuitry).
c) a loose wire contact - check the connectors for any broken wires, oxidation on contacts or loose solder points for connectors on the circuit board
Anyway, these are just possibilities so the trouble may as well be somewhere else in the system.
regards
3rq8 (Triarcuate)
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