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It looks like your green CRT is malfunctioning. You should try to see if the voltages are correct on the socket of the green CRT and check the high voltage on the green CRT using a high voltage probe. Use a schematic diagram to reference these voltages to.
I am positive that the problem is the green CRT or the circuitry leading to the green CRT. Please use caution when checking these voltages.
My first inclination would be to check the picture tube, especially if the set is over 7 years old. If it is not that, then anything from bad solder connections to capacitors or a defective IC could be the cause. If it's over 10 years old, replace it. No use flogging a dead horse.
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