new 4k tv blurry

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Joined
20 Dec 2018
Posts
4
hi just bought
jvc LT-49C870 49" Smart 4K Ultra HD HDR LED TV

in shop picture seemed fine
but set it up thought sky plus hdmi and tv ariel and picture is very blurry.
any ideas please ?

should i get a perfect picture on a 4k t.v through sky plus ?
 
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