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Have you cleaned the tuner switch contacts? If not what you need to do is get at the tuner and pop the cover off to see them. Get some TV tuner cleaner or preferably a can of deoxit, and spray the contacts, work the channel knob thru several rounds, wipe the contacts (if you can) with a paper towel and repeat if necessary.
On larger sets this is often a piece of cake, but I've never done it on a small portable so I can't speak to the effort involved.
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