I do sound for a 9-piece classic rock horn band. I set up part of my sound rig (amp, speakers, small mixer for inputs) in the garage between gigs because the band likes to party there. I have had a consumer-level FM tuner, CD player, and cassette deck like you would have in your house hooked in for some time. Everything worked great, sounded great, etc.
I recently hooked in a Phillips 19" flat screen TV and a Sony DVD player so we could watch some music videos. I got a tremendous hum which sounds like a ground loop problem. The only time I get it is when the TV is hooked into the system. The TV can be on or not, same hum. All equipment is hooked into the same 20A grounded circuit which is dedicated to this gear (nothing else on the circuit).
Can anyone tell me what the problem is and how do I resolve it?
Thanks in advance. I know this isn't exactly the purpose of this forum but I am stumped.