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Ur tv convergence ICS are dead.U have tools to do soldering,and know how to do soldering?Must replaced 2 STK convergence ICS,and some or all it resistors.Tries websites like Tv repair World.com,Tvrepairkits.com to buy a convergence to repair it ur self.The shop will cost u $300-350 for parts and labors.
Try setting a portable fan aimed toward the cooling vents on the back of the set.
If this eliminates or reduces the occurance of the lines, this means a circuit that controls the off/on of individual pixels has developed a thermal problem.
This circuit is ordinarily loacted on the main circuit board and is likely to degrade further.
You might inquire at the Panasonic service center if they have an exchange program in place and they will probably be able to confirm my suspicions.
It is not a bulb. It is a picture tube. If there are thin blue lines across the entire screen, not just the edges, and the picture itself looks too blue, it means that the blue picture tube is being driven too hard. This could be because the blue screen voltage is too high, the boost voltage on the blue picture tube is too low, or the video output is leaky or shorted. If the picture has what looks like blue arcs and double images on one or more sides of the picture, it means that one of your convergence IC's has burned out and needs to be replaced. These are things that should be tested and serviced by a qualified tech, so allow an experienced tech to handle it for you.