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About the source, is good to test with another TV your source, for checking that Electronic_M said, to be 100% sure.
About the TV, if both V and H are twitchy/touchy, it must to be a common circuit cause, ie. from sync separator back (including video, IF, and RF). Bad sync separator, or bad aligment of the IF section (making bad video freq. response) are 2 of various possible causes.
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