You are having a system control problem, usually caused by a defective switch (the "menu" switch would be the first choice), or corrosion or foreign material on the pc board. This "locks up" the micro as one of it's inputs is continually at a trigger voltage for that input. Ever spill anything into this set? A good visual inspection will often point to the problem area. Sometimes a cleaning with acetone or alcohol will "cure" this problem...not a sure thing.

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