Internal Grinding

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How would you explain this problem with my HDTV: Broken TV or common problem?

I've got a new LED LCD TV that has three options for the backlight: dark room (dim), neutral room (brighter), and bright room (brightest). I have my TV's L-R audio output connected with RCA cable to my stereo receiver. When I'm watching a source only from the TV signal (I have an amplified antenna), not the DVD player, if I select the two dimmer backlight sources I'm getting hum (ground noise) through the audio. Only when I select the brightest backlight setting do I get inaudible hum. The noise is more like a buzzing. Do you think this is a common problem with LCD TVs or do you think I may have a faulty backlight or internal ground problem?
I'm using an amplified antenna designed for interior use. But my question was is this a common problem or does it seem to be that if the noise is directly related to the selected backlight selection (again, the noise goes away when I select the brightest backlight setting) doesn't this suggest something internal with the TV may be damaged?

Sounds like a ground hum. Make sure the speaker cables are not touching any AC wires. Reverse the polarity of the AC plug on one or more of the devices. Make sure the antenna is well grounded and the antenna wire is connected properly at the TV end. The outer layer of the antenna wire is the shield/ground. It needs continuity to the TV.

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