My sony rear projection has a green tint to it. also in the bright white picture there is yellow in the background.

I han into this problem myself on my Hitachi Rear projection TV. The part that has gone bad is the "Light Engine", and is a common problem with rear projections. There are 3 mini LCD screens inside your TV. One Green/yellow, one blue and one red. When the heat builds up in the TV over time of usage, these screens will break...causing that color to "bleed" everwhere. My TV was under warranty when it happened, but the part itself would have cost upwards of $200-500 bucks and the labor is another $300-$500.

When the tech fixed my tv, he told me he would see me again within 2 years...and said I'd be better off getting a new TV. That is what the problem is. You can research "Light Engine" here on fixya, and you will find a TON of info on it...and a lot of people with the same problem.

Hope this helps ya.