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First, You should to replace by original part, then you should check the voltages on power supply, and check the voltage for vertical IC based on datasheet, also check the voltages on vertical section including yoke and last you should check the ESR capacitors on vertical section.
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do the proper isolation proceedure and try unhooking the Su from the SC board to see if you then get a normal picture all the way across the bottom half of the screen? I am assuming the Vertcal extends extends all the way from top to the bottom of the screen?
Do you have access to a test pattern or color bar ? .If you have a THX certified DVD ( some Walt Disney movies ) it will have calibration setup guide in the DVD menu.Or else you have to buy a calibration DVD if you are serious about your TV setup. First you have to set the contrast and brightness using the Grey-scale pattern. Seven set of vertical bars slowly progressing from white to black. If set right you should be able to make out all the seven bars with out each merging ( or overlapping ) into the other. You will be able to see the line of demarcation between each vertical bars. Then set the color to taste. If you do not want to purchase the above mentioned DVD disc a close setup figure for your Panasonic TV would be Picture Mode = Standard ( Normal ) Picture ( Contrast ) ---- 50 Brightness ---------------- 50 Color ------------------------ 33 Sharpness ---------------- 50 Hue ------------------------- In the middle This setting should give you a decent picture quality assuming your TV is new.
It is usually caused by problems from lead solder that sometimes does not connect, so there are some points of the components that are not connected with lead solder to the circuit. if it appears vertical line means from the IC (integrated circuit ) Vertical, you can solder all the points in the IC ( Integrated circuit ).