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Well, i've had this issue for a very long time, and I cannot seem to solve it, maybe someone out here can help me. I'm from Holland btw, so some sentences may seem incomprehensive, so if you don't know what I mean with some remarks, just ask 
My setup is like this. I made a HTPC including a matrox G550.
The computer is a celeron 1700 with 256mb ram. There's no monitor attached to the computer because it's in my living room, no keyboard or mouse is attached either. That's not imporant though with my issue.
I attached my TV, which is a 100hz Loewe, to the G550 to the matrox using the second head with the cable, which was included in the Matrox package. I mean this cable:
This cable has two outputs, SVHS and Composite. I'm using the svhs output which goes into a scart adapter @ the end of my tv. I also got a straight svhs input on my TV, but i've used both, there's no noticeble difference in output, and I was having the issue i'm gonna tell you about in this question on both inputs. Using SVHS or Composite is also results in a hardly noticable difference. Guess Svhs is slightly better
When i boot my htpc there's no output on the TV until i get to windows. This is normal, and not a problem. The G550 is configured with both Clone Mode and DVDmax enabled.
Then my frontend loads (Meedio, not important though in my issue), and when I select an avi to play everthing goes well. DVDmax kicks in, and the avi is played fullscreen. Then there is my problem:
The quality of the picture is very good I think, but for one thing. There are (hardly noticeable) horizontal bars scrolling over the screen. It's very hard to notice, but one thing i've found out is that they are CLEARLY visible in a ligth/bright background. So for instance the pages of a book, a clear white sky, a white car etc. On other colored backgrounds the stripes are much harder to notice, but they are cleary there. It's such a shame, because otherwise the G550 is a great card.
Today I lended a Radeon 7000 (with only composite tvout) from my dad, which I temporary installed in my HTPC. The picture on a G550 is clearly better, but the strange thing: No horizontal bars at all! Hence, that's why I don't think it's a ground loop problem.
The thing is, and maybe I'm all wrong about this one, I set the radeon 7000 to 100hz, I don't know if that's got anything to do with it (because i DO have a 100hz tv). I cannot seem to find a tab in the matrox properties though to set the secondary head to 100hz (?)
Another thing. Offcourse i do own other tv's in my house, but the Loewe is the best tv i've got, cause it's widescreen, and in the livingroom
But a couple of days ago I took my HTPC upstairs to my small 4:3 tv in my bedroom for a tvout test: No horizontal bars @ all.
So I think this problem really is specifically related to my Loewe TV <-> G550.
Anyone can help? Cause I payed a lot of money for my g550, and the cheapass radeon 7000 of my dad's is even giving beter output, it's not as sharp, but there are no stripes/bars at least, i'm desperate, i really wanna use my Matrox to full quality
I still trust the Matrox products, but this is a bit of a downset
My setup is like this. I made a HTPC including a matrox G550.
The computer is a celeron 1700 with 256mb ram. There's no monitor attached to the computer because it's in my living room, no keyboard or mouse is attached either. That's not imporant though with my issue.
I attached my TV, which is a 100hz Loewe, to the G550 to the matrox using the second head with the cable, which was included in the Matrox package. I mean this cable:
This cable has two outputs, SVHS and Composite. I'm using the svhs output which goes into a scart adapter @ the end of my tv. I also got a straight svhs input on my TV, but i've used both, there's no noticeble difference in output, and I was having the issue i'm gonna tell you about in this question on both inputs. Using SVHS or Composite is also results in a hardly noticable difference. Guess Svhs is slightly better
When i boot my htpc there's no output on the TV until i get to windows. This is normal, and not a problem. The G550 is configured with both Clone Mode and DVDmax enabled.
Then my frontend loads (Meedio, not important though in my issue), and when I select an avi to play everthing goes well. DVDmax kicks in, and the avi is played fullscreen. Then there is my problem:
The quality of the picture is very good I think, but for one thing. There are (hardly noticeable) horizontal bars scrolling over the screen. It's very hard to notice, but one thing i've found out is that they are CLEARLY visible in a ligth/bright background. So for instance the pages of a book, a clear white sky, a white car etc. On other colored backgrounds the stripes are much harder to notice, but they are cleary there. It's such a shame, because otherwise the G550 is a great card.
Today I lended a Radeon 7000 (with only composite tvout) from my dad, which I temporary installed in my HTPC. The picture on a G550 is clearly better, but the strange thing: No horizontal bars at all! Hence, that's why I don't think it's a ground loop problem.
The thing is, and maybe I'm all wrong about this one, I set the radeon 7000 to 100hz, I don't know if that's got anything to do with it (because i DO have a 100hz tv). I cannot seem to find a tab in the matrox properties though to set the secondary head to 100hz (?)
Another thing. Offcourse i do own other tv's in my house, but the Loewe is the best tv i've got, cause it's widescreen, and in the livingroom
But a couple of days ago I took my HTPC upstairs to my small 4:3 tv in my bedroom for a tvout test: No horizontal bars @ all.
So I think this problem really is specifically related to my Loewe TV <-> G550.
Anyone can help? Cause I payed a lot of money for my g550, and the cheapass radeon 7000 of my dad's is even giving beter output, it's not as sharp, but there are no stripes/bars at least, i'm desperate, i really wanna use my Matrox to full quality
I still trust the Matrox products, but this is a bit of a downset
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