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RFI from steel TV bracket?

Yesterday I installed a new TV on a steel wall-mounted extendable bracket between all my electronic components.
I now have a low hum/buzz from both speakers on all sources....even with the preamp on mute?
When I switch the preamp off.....the hum is still there.
The only way to remove the hum is to switch the amps off?
I tried grounding the steel bracket to the preamp and then the amps without success.
The previous TV was in the same location but sitting on the shelf.....not a steel wall bracket.
Any help would be dearly appreciated?
128x128halcro
hifihvn
943 posts
 
Possibly, the interconnects to the amp aren't shielded and picking it up(?) or, if this TV is a Plasma, they do give more interference.
halcro's avatar
halcro OP
2,289 posts
 
Last TV was plasma. No hum.
This TV is LCD......hum.
But it hums with the TV completely unplugged so I don't see how it can be the source?
theaudiotweak
1,793 posts
 
Ground loop from your cable tv or sat box. Unhook the coax cable from the source tv direct/cable box or sat and turn everything else back on and take a listen. Tom
jea48
2,944 posts
 
Yes I unplugged the TV and also tried it in different GPOs.....even a power conditioner. I even disconnected the 'sound-out' of the TV from the preamp. Hum still there.
11-13-11: Halcro


Want to rule in or rule out 100% the hum is being caused from the metal bracket? Take the TV down from the metal TV bracket, set the TV in the middle of the room, and then check for hum...
theo's avatar
theo
2,331 posts
 
If I understand this you just installed the TV mount onthe wall. Is there any chance a screw cut into your Romex in the wall and is hitting a grownd wire? I would say try removing a screw at a time and check for the hum. It just odd that an LED Tv is doing this or that the metal mount is causing it.
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