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Looks to me that someone added a metal can electrolytic cap just above the high voltage cage ( the box with the "Warning" label). Sometimes people add new caps across bad caps, but that is incorrect.
Since the vertical frequency is nearly the same as the 60 Hz power line frequency and faulty electrolytic caps (filter caps) do not suppress the power line frequency, bad filter caps commonly mess up the vertical sweep.
Working on TVs is a bit more dangerous than working on radios, because of the large CRT and the high voltages involved. Make sure you learn about the added danger.
Phil's site is very good.
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