I was surprised to learn when you buy a HD TV it needs to be tuned (settings adjusted) in order for it to provide the best possible HD quality picture. Did you know that? Seems like many buy HD TV and just turn them on without realizing that they need to be tuned.
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You can still watch a HD TV untuned, but you will not be getting the best picture quality. Generally yes. Google this subject. There are plenty of people offering advice. Google the specific TV you are buying for tuning suggestions.