Panasonic Plasma TV with darker areas on screen

Panasonic Plasma TV with darker areas on screen

I have an old panasonic plasma tv, model TH-50PX60U, with darker areas on the screnn in a solid pattern that looks like a wave. There’s still a visible picture in these dark areas but it’s very noticeable when there’s a solid color on the screen, such a a football field. Can this be fixed?

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