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Contrast changes every 3 seconds

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[video|5215]

Vizio model D50f-E1, Set is 4-5 years old,Contrast changes every 3 seconds. see video. Appears that led (or row)in upper left of panel changes brightness.Is this a common Vizio problem? flat panel prob or led driver?

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Vizio D-Series 50-inch LED TV

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open