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Your horizontal and vertical are working just fine. However, the image with the edges affected like that would indicate that the fine tuning is way off, to the point that you may be on the wrong channel. It could also be that there is a problem with IF (intermediate frequency section) alignment, but that is MUCH less likely.
If your source is supposed to be channel 3, go to channel 3 on the receiver and then try turning the fine tuning as far as it will go one way and then the other to see if you can find a good picture that locks in solidly.
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