There shouldn’t be any buzzing noise if phono line is properly grounded. You should another phono cable with better shielding.
Phono line on receiver is always live.
I was re-arranging some cables on my receiver. While I was on the tv mode on the receiver, I noticed the phono lines still made a buzzing noise when i accidentally touched them. I tried this with the tape cable and no noise. Is the phono line always live regardless of the chosen input on the receiver? Is this a matter of not grounding the phono line?