[mythtv-users] OT: Optimising 50Hz over 60Hz VGA
Ben Lancaster
lists at benlancaster.co.uk
Wed Apr 11 13:06:04 UTC 2007
ryan patterson wrote:
>
>
> On 4/11/07, *Flo* <flo at flobittner.de <mailto: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.
Seconded. Are they both plugged in to the same socket/multigang? If so,
then I guess it could be your PSU, or your graphics card misbehaving.
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