Old thread I know, but I was experiencing smiilar issues as the others in this post and just wanted to share my experience and hopefully help out others.
This is one of the few threads around which closely addressed this issue in the Vizios, but I'm sure it happens on other TVs as well.
First off, I have a VX42L that was manufactored in 2007 I believe (going off memory - at work at the moment).
I wasn't getting quite the green extremes as the example pictures in here, but I was experiencing some posterization / solarization on some colors.
I tried reseating all the cables (mainly the LVDS), but that didn't help. From there, I was pretty sure it was the t-con board.
First one I found on ebay fixed the color, but only produced a picture on half of the screen (which seems to be another common problem). Luckily, they refunded my $33.
I found another for about the same price on ebay. They didn't take returns, but I figured I'd take a chance.
Installed last night and I'm back in business for the time being. *knock on wood*
For those who *fixed* it with just an LVDS cable, I'm of the opinion that it was just a matter of reseating the cards which probably *cleaned* the contacts, but I could be wrong...
In other news, I can pull my tv off the wall, take apart, install t-con, reassemble, and hang back on the wall in about 15 minutes now!