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I worry if measured power in a resistor is exceeding the power rating. Engineers don't spec resistors of lower power than they designed the set to send through those resistors...So somewhere something is wrong and overloading that resistor.
Are those white lines in short dashes in a 3x3 grid? If so and you are using a DVD/Blu-ray player or a VCR then those are not the set's fault, but rather a form of analog copy protection called macrovision encoded on the media your playing. Macrovision violates NTSC signal standards and messes with TVs that predate VHS...TVs made after VHS came out have design tricks to suppress those lines.
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