External/aux audio distortion with Sharp HDTV.

I wonder if someone can help me with an issue I've experienced with the audio output of my TV. The problem is that the sound plays fine on the TV's speakers, but sounds distorted (buzzing, crackling) when routed to an external speaker. The problem has recurred on two different sound destinations (a boombox and a Vizio sound bar), and it happens with multiple HDMI cables, with both the DVR and the Apple TV. It seemed to get much worse when I upgraded to the new Apple TV, and it mysteriously spread to other outputs, but problem was minimally there starting with when I bought a blu ray player (which is no longer even connected, so it is not the source of the problem either).

The problem never happens right away, but takes about 20 minutes to kick in. If I pull out the HDMI cable and pop it back in the same port, the sound is fixed for a few minutes but then comes back. Again, it is not confined to one specific HDMI cable. The only common denominator is the TV itself, but until last week the problem was rare and only seemed to flare up when I bought the Apple TV. I'll buy a new TV if I have to, but I'll be furious if I do that and then find out it was something simpler. Any thoughts?

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Check with Sharp for firmware updates to the TV.


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Hm ...

I actually don't see an Ethernet port on my tv, and I know it doesn't have wifi.

Here's what else I found -- when the Apple TV is disconnected, I have no problems with audio at all. Tomorrow I'll test whether the Apple TV has problems when plugged in by itself. It seems like the TV finds it to be a strain to have multiple devices connected at once when sending the audio externally.

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