Display does not follow dial

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Display does not follow dial

balanced mod
In my friends K2 the dial turns freely, a frequency on the display shows, but the actual frequency does not follow. Sort of jumps. He is disabled and asked me to help in repair. Any ideas where to begin. I think the control board is the problem, and might need a new chip that I see on the board. I could not find any burned parts or cold solder joints. Can it be repaired? Where else should I look? Thanks Gene