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If I had to guess I would say it's either the DLP chip or the prism. Simply put the lamp lights the DLP chip which directs the light into a prism and then onto the TV screen. The prism or prisms are responsible for aligning the colors correctly. The DLP chip is essentially a million little moving mirrors which direct light
If you're at all comfortable with electronics you might want to open the TV up to take a look. You might get lucky and find something obviously wrong with the TV. Sometimes adhesives melt and parts slip out of place. If your DLP chip is blown there isn't much you can do. You're probably right that this would cost a lot to fix and not be worth it.
Most likely you also have a bad Optical Block assembly. Do to the cost of the part, I would not invest the money to replace it. The Lamp failing would not cause this to happen.
I hope this helps,
Skyassoc
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.
I get this too with my Samsung. Are you watching HD content or standard (cable, satellite) tv? If it's the latter, that's why. The lack of quality really shows on analog signals. The shows that I Tivo look horrible a lot of times. Another thing is the connection to the television. If you are using standard RCA connectors, try switching to either component or HDMI.
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