Thanks for reply.
Tv is 4 years old, out of waranty.
I did call closest authorised Pioneer repair shop. Very nice to talk to. He did think about problem, did some phone call checking, and HE called me back.
I then got a very polite but firm 20 minute discussion about how Pioneer was terrible to deal with , it would cost me a minimum of $ 500 to look at and repair with no promises of not more because Pioneer didn't really want to be helpful. He was on his own.
He did say it might be a failing y board - no way to know with out checking and I would have to accept a potential $500 or more before he would start, So I told him I could not do this. That's reason I am checking the forums to see if anyone has experience/suggestions.
Another forum had the pot adjustments on a Phillips to solve. Also if a y- board, is this something I can change myself. I do know a little about electrical.