I have rca scenium dlp 51 screens dark and i just replaced the bulb

SOURCE: rca scenium 52 inch replacement screen

I`ll have to be the bearer of bad news, the image is not burned onto the screen it is burned into all 3 of your picture tubes, which basically means the set is junk because the cost is too high.

SOURCE: dark picture on RCA Scenium 61 in DLP

Yes, the lamp will gradually get darker as it nears it's end. The rolling lines sounds more like the set is on a local channel for the cable hook up. If your local area has a channel 3 or 4 live terestrial broadcast simply tune the cable box output to the other one, the same for the tv.
If this is cable/local broadcast issue it will go away in Febuary when the NTSC broadcast ends.

SOURCE: i have a 61 inch rca scenium dlp tv. the picture

Change the Lamp.

SOURCE: TV screen is dark

If the picture is dark then I suspect a bad lamp if you just replaced it...

electronic & computer repair& servicre

• 12061 Answers
• Posted on Apr 29, 2010

SOURCE: RCA scenium model hd50lpw165. lamp went out-

http://www.tvtechcenter.com/board/links/rca/ATC311%20Training%20Manual.pdf
OK above is a service and training manual this is what engineers use to teach engineers how to fix sets like yours Use this an you may be able to repair READ THE SAFETY INSTRUCTION FIRST.