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Ground Loop in HT system???...HELP

I have a reoccuring hum coming thru my amp and cd player about every 5 to 7 seconds.
My equipment is McIntosh mc205 and mx136,Naim Audio CDX,Oppo 93,Furman Elite 20PFi,time warner cable box and Pioneer Elite Pro 110fd plasma tv. All on a dedicated 20 amp line.
I've narrowed it down to the tv. When the picture's on the hum is there, when tv is off...no hum. It's not the cable box either.
I had luck with an extension cord for the tv-plugged it in across the room...hum is gone. Also used a smaller LCD tv set up with in the HT and no hum. Is it my HDMI inputs on the tv? I'm lost and no one seems to the any answers. Any help would be very much appreciated. Thanks guys
mlopardi
jea48
2,944 posts
 
Mlopardi,

Do you have all your audio equipment, CATV box, and TV plugged int the Furman Elite 20PFi?

I had luck with an extension cord for the tv-plugged it in across the room...hum is gone.

For a test try plugging the TV directly into one of the recepts of the dedicated 20 amp line. Check for hum.
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mlopardi OP
3 posts
 
I tried plugging the tv directly into one of the recepts of the quad dedicated 20 amp line and still have the hum...It's got to be something simple but I still have no clue. I'll continue to try...keep the suggestions coming. Thanks guys
csontos
1,275 posts
 
I have a separate receiver for HT. When that receiver is turned on, I have a similar issue, regardless of whether the TV or cable box is. When it's not, I don't, regardless of whether the TV or cable box is. If you don't have a separate receiver, you probably have to ground your TV, cable box, or both.
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