I had buzzing on both of my Samsung LCD's. They sent a tech out and he replaced EVERYTHING but the screen on one of them, still no better. It would go away if the back light was set all the way up at 10 or turned all the way down to 0. I believe what you are hearing is the voltage regulator that controls the back light and the noise goes away under the 2 conditions because it is either totally open or closed at those 2 points.
Bill
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