Quite honestly, you likely have the bass turned up too loud in your audio settings, so it needs to be reduced until the "buzzing" stops. Most likely, the buzzing you hear is the plastic shell of the LCD TV resonating.
LED's and LCD's aren't like traditional TV's or even Rear-Projection TV's that were created for picture and sound. LED's and LCD's are all about the picture, not the sound.
Your best bet is to either add a soundbar and wireless subwoofer or hook it up to a stereo receiver and speakers. You'll never get the audio performance you seem to desire otherwise.
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