[mythtv-users] OT: Optimising 50Hz over 60Hz VGA (was: Smoother video playback?)

ryan patterson ryan.goat at gmail.com
Wed Apr 11 12:44:53 UTC 2007

On 4/11/07, Flo <flo at flobittner.de> wrote:
> There's only one thing left with my picture, sometimes there's like a wave
> moving downwards through the picture. I think there's a difference in the
> vertical sync of my lcd and the graphics card. But i'm not sure because
> it's
> hard to describe and to find anything about that...

Sounds like a ground loop problem to me.  in short, the LCD and the computer
both have their power cords connected to ground.  But there is a small
voltage difference between the LCD's ground and the computer's ground.  This
causes a small current in the ground signal of the video cable going between
the LCD and computer.

Ryan Patterson
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mythtv.org/pipermail/mythtv-users/attachments/20070411/7be346b0/attachment.htm 

More information about the mythtv-users mailing list