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RCA Rear Projection TV P46729BA Distorted Picture

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jagged

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I have an older RCA rear projection tv model #P46729BA, chassis #P1K169PCA. The picture gets distorted and rolls vertically every once in awhile. Is there any way to adjust this? I can adjust the convergence, but this still doesn't clear up the distortion. It seems to be worse when you first turn the set on. I am enclosing a few screen shots so you get a better idea of the problem.

Thanx!
 

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