Problems with new lg lcd tv

My parents bought a new lg 27'' tv yesterday, and they seem to be having issues with it.
They have it linked to sky via magic eye, and my dad has just phoned me and said that whenever they are on the menu, the whites look streaky, yet works fine on freeview.
He has tried other tvs in the house on the same link and they seem fine.
What could the problem be and how do we solve it?

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