Did you actually pull the plug out of the wall on the tv? TV's are "on" even though you turned it off.
Turntable hum
I have a Pro-Ject 2 Experience turntable with a Pro-Ject Phono Box SE and a Sumiko Blue Point 2 cartridge, the phono box out is going to a Sherbourn PT 7030 preamp then to an Emotiva UPA 700 power amp. I have a pretty significant hum when I turn the turntable on the turn table is setup next to a plasma TV. I kill the power to the plasma but this doesn't help. Anyone have any ideas on what could be causing this hum?