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The problelm is a
defective vertical deflection system. Could be the amplifier, vertical
output driver or whole printed board that supports the vertical
deflection activity. It is considered to be a serious failure. The cost of repair will be around $200 to $300.
on this type of tv each gun is controled by hor.and ver. chip together. it is on the board that controls the convergence of the tv. some manufactors have recalls on problems like this. i dont know if this one does but it may. you can check with mitsub. i do know that this part is about 250.00
Sounds like you have shorted or open Vertical Filter Capacitors. ( you may also have a bad vertical drive chip now since you've waited to replace the capacitors). You'll need to replace the bad capacitor/s and if the problem doesn't go away, replace the chip also. And as always, check for any cold solder joints ( bad lead connections to the printed circuit board ) as you replace the bad components.
I Hope this has helped.
Have a Great Presidents Day