Horizontal scroll line

[Barkley44]

Hi,

I've had a scientific altantic 8300HD digital box upstairs connected to a DELL LCD via HDMI, no issues.

We just finished our basement and now that the projector is up and running (Panasonic AX-100U) figured it was time to bring the digital box downstairs. I use a Denon avr-2805 for a/v.

Up to now I've had the xbox attached, no issues. Now that I've attached the digital box, I get a scrolling horizontal line (from top to bottom across the whole screen). I have it setup to use component and optical cable. I tried all 3 component inputs on the denon and the line remains. I switched to s-video instead, to see if it was the cable (and I tried a different component cable, no luck) and the s-video does the same.

Any ideas what to try next. Unfortuantely, my denon does not have a hdmi input.

Thanks!

 

[Barkley44]

One more thing I just noticed

With the digital box connected, I now notice the xbox video has the scroll lines too. When I disconnect the component video, the lines go away. So clearly something there - can I really not use the digital box?

 

[MDS]

The symptom you describe is a good old ground loop. There is an article about dealing with ground loops in the education section of Audioholics.

 

[mtrycrafts]

With the digital box connected, I now notice the xbox video has the scroll lines too. When I disconnect the component video, the lines go away. So clearly something there - can I really not use the digital box?

Here you go, buy this, the isolator on the top, and post in the morning
Place it either output or input to that cable box.

http://www.cencom94.com/gpage.html8.html

 

[mtrycrafts]

With the digital box connected, I now notice the xbox video has the scroll lines too. When I disconnect the component video, the lines go away. So clearly something there - can I really not use the digital box?

One more thing. If you have both a video and audio cable out from the cable box, you need to place that isolator before the box otherwise, that ground loop will find its way into the video. Elusive bugger.

 

[Haoleb]

If you have any sort of power conditioning device that has coaxial protection try running your cable through that. I was able to get rid of humm in my subwoofer by doing so. In my expeirence video grounding issues are a bit harder to get rid of though.

 

[Barkley44]

That did it

Thank's everyone for their help, the issue is solved.