You need replace VFD driver chip: MM58324N.
Hey Pete! Did you take out the 9V battery as well and let power down to re-set? Benimur from JustAnswer suggested: Your described problem could either be a system glitch, hardware fault.
If it were a glitch, unplug the unit for an extended period of time to force the Bose to reset and revert to factory defaults. This would also require removal of the 9 volts battery. Should this be not corrective, then it would seem that the logic circuitry of the Bose radio is faulty. The logic circuitry includes the micro processor that handles all the controls and the displays. Unfortunately, not a user doable repair.
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