Sharp XM-2001/XM-1801 Sensitive Screen Knob

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I've got a XM-2001N that has a very sensitive screen knob off the flyback. Chassis has been fully capped and has a new flyback. Starting with the screen knob fully counterclockwise, if it turn it just a tad I get a good picture, but if I turn it anymore I start get retrace lines and then and the edges of the screen develop a vertical wave.

Any ideas what I should check or where I should start looking first?
 
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