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BOTH OF THE STK-392-560 convergence chips need to be replaced; there are also fuses on the power board that protect them--do not look like fuses; if you need photos of the place where the chips are and the fuses, let me know.
Repair takes about a hour and parts if purchased on EBAY will be under 25 dollars.
Look at attached photo--if it is what you have you have a convergence problem.
The KP-53HS10 uses two of the STK-392-020 convergence chips.
Both will need to be replaced and the set adjusted--parts cost on ebay is less than 20 dollars--repair consists of two things--getting at the parts and then replacing them--chips are soldered in so you need to be able to un solder them and solder the new ones in.
LET ME KNOW IF YOU HAVE QUESTIONS-I am here to help.
If this has helped out, rate this solution as I do this here for free.
A "Gray Scale" adjustment may solve you problem.
If one of the picture tubes is set too high it will cause these RETRACE lines.
Then too a weak picture tube might cause this.
If the horizontal lines are one color: red, green,or blue then whichever color that is shown would tell you which tube is set too high.
Your set has 3 screen controls that control the brightness of each tube. One may need to be turned down a little.