I started getting this cackling sound about a week ago. First the sound went out and we started hearing the cackling. Disconnected all audio connections and we are using the theater system for audio. TV was put on mute, but it continued. I had replaced the bulb about 3 weeks ago successfully and don't think that had anything to do with this. Unplugged the TV from the set and replugged it back in. Plugged into a different outlet jack. Went to the tv programming by hitting mute+1+8+2+power while set was off. Then did a reset, both types listed. Since the second reset I have not heard the cackling. Don't know if that was the problem or solution, so far so good, but only 30 minutes. Normally I hear it by now. By the way, TV is only 2 years old and first had problems with the DLP, had to be replaced twice due to small dots on the tv, fortunately under warranty, but still have large white spots on the screen. The the bulb went out, normal, and now this. Samsung has been little help and Circuit City went out of business. I will not buy another Samsung product. This TV has been the most unreliable tv I have ever bought.
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