Hey guys, sorry to jump in here,
But I have a similar problem except with the ST50 model.
I ran break in slides for 100 hours and after that have used the tv for an additional 300+ hours with no issues.
Now, I am having image retention issues all over the place.
1) Turned on TV, turned on Oppo player (says "oppo" while waiting for disc, up about 10 seconds), put Finding Nemo in, and for 30 minutes, I saw "oppo" retained on the screen. What I can't believe is the word "oppo" was only up for about 10 seconds and lasted 30 minutes. I thought for an image to be retained it had to be on the screen for a significant amount of time.
2) The other day, I checked on the guide my PVR/DVR for just a few seconds and some of the details where retained for about 10 minutes
3) Playstation 3, the cause of most IR as most people have posted all over the internet. A quick example. Playing tiger woods, I see "tiger woods pga tour 13" the whole game, just from the title screen. It is quite bad. I also have to make sure the golfer I choose does not wear white clothing or shoes. It's quite frustrating.
It seems like image retention problems are getting worse as the tv ages. I thought it was suppose to get better as the tv ages.
I have been running slides to help with the IR. I try to mix it up with no transitions, wipes left, wipes right, wipe up, wipe down, random. I guess it helps a bit, but I can still see a few things retained that won`t go away.
Any help or ideas would be great.