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Depending on the age of the device - and dust conditions in the installed location, the lens may have a fine coating of dust or dirt on it.
You could try directing a blast of compressed air from the cans you may find at Radio Shack (or other electronics hobby shops and other places, too), at the lens. If unsuccessful, try a dampened (not soaked) lint free cloth (or q-tip) with ammonia or non-streaking windows cleaner and **gently** wipe the glass lens - if accessible.
Excessive pressure or use of an abrasive material (such as a paper towel) can scratch the lens or damage the mechanism that the lens is supported on.
I don't have a solution, however, I do have the same problem. When it happened originally, I smelled electrical wires burning. someone checked it and said that a wire had shorted. The electrician checked it out but could not find out what was wrong with it. The radio comes on, but we cannot use any of the buttons.