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My tv won't change resolution also sound only works if on soundbar.

Recently bought a TV from marketplace owner said he couldn't change resolution also the sound from TV will only work if connected to a soindbar but when completing a sound test it works on TV can't seem to figure it out the model number is

Ue55f800st

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@kieranstewart going by your model number your TV is a Samsung. Anyhow, I am slightly lost by the "couldn't change resolution". What exactly does your TV display when you turn it on etc.

The issues with the sound could be a settings issue or could be a main board issue. Let's start with the basics. What does your TV do?

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