Blotches on images especially images with a light background eg.

You need to replace your color wheel. Part# BP96-00674A. This has been a common problem with the samsung dlp's. I hope this helps.

replace all three image units.

The 920WM has a recommended resolution of 1440x900. If your display properties are set to a higher or lower resolution, there will be ugly effects on videos, photos and fine text.

If you're running WindowsXP, minimize your apps and web browser so you can see the background.
Right-click on the background and select "Properties" to bring up the display properties dialog.
In that dialog, select the "Settings" tab to see the display resolution.
Set that to 1440x900 if it's not already, then hit "OK"

If videos are still blotchy, then check the video playback software to make sure it's not setting it's own resolution.

If that helps, please be sure to hit the "thumbs-up" button for me.

If not, use "add comment" to fill in some more details (XP or Vista? What's the video playback software called? How are you viewing pictures?) and I'll do my best to help!

You'll probably need a new optical engine for your TV. Sony extended the warranty for some of their LCD projections but I think that the warranty extensions have all ended. Try Sony.com for more info.

The Optical Block / Light Engine is the problem. Very expensive repair / over $1000

Sounds like a worn drum unit primarily the cleaning blade on the drum is failing. If you don't change it out soon the dirt escaping from the drum and dirty copies will foul-out you fixing unit, = more $$.

bad color wheel

Convergence issues usually present as colors not lining up or a sort of "3D" effect like when you had to wear the green and red glasses. I'm no expert but it sound like you may have a magnetizing issue. You can test this by placing a large, very strong magnet on the "blotchy" area.

Slowly move the magnet in an ever widening circle. Pull the magnet back off the screen about an inch once you have circled the entire blotch but continue to rotate the magnet. Do this for about 5 minutes. If you don't see any change once you may need a stronger magnet or this is not the problem.

I had the same problem with a 6 year old Toshiba 50H13 and I found this tip online somewhere. I used a half dollar sized, rare earth magnet. I noticed a change almost immediately.

Hope this helps

Will Banks

Are there any magenetic devices like speakers or high amp stereo recievers next to the TV? These blotches could be because of electro-magnetic intereference. Try moving devices away (anything metallic or which has a magnet in it)