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Model 70LB650V-ZA Screen goes black but sound can be heard

Model 70LB650V-ZA Screen goes black but sound can be heard

TV screen goes black when watching Netflix or YouTube or when sky box is connected..never happen when watching regular TV…...what causes that? TV model.is LG WebOS 70LB650V-ZA and running the latest software version 05.05.70.

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