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The behaviour you're describing is generally known as global dimming or dynamic contrast. Local dimming is something completely different.
It's (intended to be) a feature rather than being a fault. While all manufacturers implement their version of it on at least some of their TVs, most do give you the option to disable it and some, like Sony, generally have it disabled by default.
Samsung unfortunately aren't one of them are often don't provide the ability to disable it easily. Its worth trying other picture modes as you may find PC mode or similar doesn't have it.
Which model do you have exactly? A recently bought '7 series' is presumably a Q7F, Q70R, NU7### or RU7###? |
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