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Have you been assembling your MPGuino by yourself? Can you dimm the LCD with the middle button? If not there's something wrong with LED power supply.
Give some more details about your build. If you're using Arduino board or single ATmega chip? I'll give you the solution then. But first check if you can dimm your LCD.
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Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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