Paddlersean,
I have the SAME problem as you that I still struggle with it. I have a 6 or 7 year old 27" JVC tube TV. I have an entertainment center with a stack of components next to the opening for the TV - so the TV and all the cabling is in close proximity. I have bad hum in my system with the TV on (and none with it off). I tried the ground loop breaker and it didn't work. Then I realized it was coming from the TV itself. If I listen to the TV's internal speakers, they buzz some as well, even with the volume set to zero. I can move interconnects around between my receiver and external amps and make some channels quiet, but never could get rid of it on all channels.
I am convinced it is an EMI emissions problem. My final test was to take the TV out of the entertainment center and onto the floor in front - no buzz even with the TV on. I am guessing it is the power supply transformer that is emitting noise that gets picked up by the cables which act as antennas. I have considered using to use some ferrous (steel not aluminum) sheetmetal as an EMI shield to try to isolate the TV from the rest of the system. But I never did try it and currently just live with the problem.
With the entertainement center like we have, there is no real way to physically separate the TV from the cabling, which is the solution. I am just holding out until I move everything to a basement home theater set-up where I will be able to separate them by using separate racks.
I have the SAME problem as you that I still struggle with it. I have a 6 or 7 year old 27" JVC tube TV. I have an entertainment center with a stack of components next to the opening for the TV - so the TV and all the cabling is in close proximity. I have bad hum in my system with the TV on (and none with it off). I tried the ground loop breaker and it didn't work. Then I realized it was coming from the TV itself. If I listen to the TV's internal speakers, they buzz some as well, even with the volume set to zero. I can move interconnects around between my receiver and external amps and make some channels quiet, but never could get rid of it on all channels.
I am convinced it is an EMI emissions problem. My final test was to take the TV out of the entertainment center and onto the floor in front - no buzz even with the TV on. I am guessing it is the power supply transformer that is emitting noise that gets picked up by the cables which act as antennas. I have considered using to use some ferrous (steel not aluminum) sheetmetal as an EMI shield to try to isolate the TV from the rest of the system. But I never did try it and currently just live with the problem.
With the entertainement center like we have, there is no real way to physically separate the TV from the cabling, which is the solution. I am just holding out until I move everything to a basement home theater set-up where I will be able to separate them by using separate racks.