Well, the simple solution is to put a variable resistor or potentiometer inline with the LED's but I don't know what the circuit looks like. It may be more difficult in practice due to each of the LED's may be on separate circuits. The other issue is finding the right pot as far as how it turns, mounts, and the resistive value.
Invader, as you've seen the circuit board, do you see a common lead (positive or ground) that could be tapped into so that pot could be added easily?
Edit: Whoops, I think you're talking about the LCD instead of the LEDs, correct? If the LCD uses an EL panel that is much more difficult to adjust.
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Last edited by acinonyx; 01-05-2010 at 02:22 PM.