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Diagnose LCD screen problem.
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This guide is for NXT bricks that have blank or flickering or dim LCD screens or dead areas.
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Your brick should power up as normal - making the opening 'chime' and the usual button-press noises, but have issues with the screen - if you are getting nothing at all (check the batteries!) or a very quiet steady clicking noise it is probably a firmware problem so try and update or fix that first.
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