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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
theo's avatar
theo
2,698 posts
 
My first thought is; it's not the rack but the TV. Try lifting the ground to the TV. Or possibly pluging the TV into a known different circuit that is on the opposite phase of the balance of your system. One other suggestion if you feel it is the rack, can you put the old TV(if you still have it) on the steel rack and determine if it is indeed the rack. And fiannly I assume you have tried unplugging the TV to see if the hum diminished?
I have been down this road and you just have to try every possibility to find the gremlin. Good luck.
halcro's avatar
halcro OP
2,664 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.
Interesting thing is that the hum is from the amps and not the preamp as when I listen to my headphones which are plugged into the 'tape-out' of the preamp......no hum?
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.
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