It doesnt. It was pure matter of chance in the old electronics that had vastly different manufacturing processes than it has now. In the old days you had bulkier components and much more movable parts, and sometimes, they would slide a bit out of their positions over the time or some connection would get loose. Smashing it would sometimes, way less than it is shown in TV shows/cartoons, put it back to place and re-eastablish the connection.
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