Hi, I've been searching this forum for my issue and I've found some things that seem like it might match, but perhaps not. Any help or general clarification is greatly appreciated.
I bought a md6580n (oct/2005 manufacture date) from a guy who said it was posterizing. I got it home and posterization isn't the only problem it has.
What I'm getting is horizontal red lines whenever there are bright/white objects on the screen. The red lines start a few (maybe 5?) scanlines down below where the object starts. An "object" can be any bright pixel(s) and I'd say the brightness range is 70% to 100% (100% being pure white and 0% being black). In a bright scene, all lighter colors and the edges are red.
For example, if I go to "source->visual select" on the remote, the horizontal white lines in there are underlined by red lines that run the whole length of the screen. However, the redness goes away in 30-45 minutes (not counting idling, the TV has to be displaying video).
I hooked up 2 DVD players on various inputs to make sure it wasn't specific to one device or my gear. I tried component, S-video, and composite.
My feeling was that I could fix this by checking for cold solders and replacing convergence ICs. After reading about light engine problems in these units, I'm not sure if that's the case or not. "reflowing" the board will be free, replacing the logic board is cheap (according to HP Pavilion support), and replacing the light engine is ~$2000 from what I'm reading here.
As I hinted, I did call Pavilion support. They weren't sure what the problem was since it goes away. They opted for the light engine but admitted they were only guessing. I have to assume they were taking the statistical safe bet.
They indicated that it's $220 for CompUSA to look at it. I paid $300 for the set, so I have to assume that the seller thinks it's the light engine.
Anyway, thanks again for any input!