On Mon, 21 Mar 2005, Howard Cokl wrote:
I've seen a (really) old CRT projection TV that had differing convergence depending on the signal that was being displayed. Its internal test pattern for convergence changed whether there was a channel displaying or not.I had my myth box hooked up to my old Hitachi HDTV using an AA 9A60 and it appears that the 9A60 makes the convergence go off. It's not a modeline problem because it occurs during boot up before X starts. I was previously using an RCA VHDC300 for the same purpose and it did the same thing but only worse. Is there any thing I can do or look at to fix this? I am back to using S-Video for the time being since the picture is superior to vga->transcoder route. I'm using an nvidia 5200 right now, does this sound like a video card problem? --
Anyway, the convergence *shouldn't* change unless something is broken. Sometimes moderately designed TV's have issues with sync polarity. I'd try a modeline that changes the sync polarity in case the A960 does sync a little different on different polarity. I don't recall if an A960 has adjustments for L/R, but you might want to try that. It's also slightly possible the A960 is broken and has different length in the signal path. You *are* using the same length cables for each of the Y, Pb, and Pr, right? If you're running a 30MHz dotclock down a 2m cable, there are 1/3 of a dot to be drawn on the screen *IN TRANSIT* on the wire. Doesn't sound like much, but it's just something that a lot of people don't think about. Longer cables/high dotclocks make it worse.
-Cory
************************************************************************* * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * *************************************************************************
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