Sounds like your tuner is dirty. If it's the turret type, I take out that whole assembly and clean EVERYTHING in there well. i don't recommend it, but you theoretically can soak the tunner in something like simple green. Gotta wash with clean water and make sure it's really dry prior to power, or *poof*
TV tunner 'cleaner' is evil stuf. it gums up, attracts dirt, so they sprayed more and more in there, and it never does anything real anyway.
BTW, the diff between regular and 'color' was that 'color' was scented!
I find once you get all the crap out, buff up the springs with an eraser or such, and form them out a it to make better contact, the turret type tunners work nicely. Switch types, you just clean and pray
