The problem is in the Vertical circuit of the set, fold over and/or retrace lines at the top.
Problem will be either a bad vertical output IC or caps around it that are bad.
Unless you know how to solder and what to look for it will be a shop repair, if it is continued to be used this way sooner or later it will go to just a white line left to right in the middle of the screen.
Let me know if you need more information.
SD TECH
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