Broadcast tv is maximum 1080i, but your tv is upconverting it to 1080p as all HDtvs display at their native resolution only. So what you are seeing is 1080p. For native 1080p signals you need a blu ray player or newer game system. You can't adjust your tv for what it receives as a signal.
If you don't see any spots on your tv when you are watching it, relax and enjoy it, don't go looking for every imperfection in the world, if you can't see it, assume your tv is good.
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