[mythtv-users] Horizontal lines with NVidia TVout

Stuart Morgan stuart at tase.co.uk
Sun Jun 26 20:37:24 UTC 2005

On Sun 26 June 2005 21:16, Fedor Pikus wrote:
> I've had my Myth box connected to a CRT and a small Toshiba TV (NVidia
> composite TV-out), and had excellent picture on both. Now I moved it
> to my AV system and connected it to a 32" Toshiba TV (CRT), I tried
> SVideo and Component out, and I always get the same problem: light and
> dark horizontal lines or bands slowly drifting up the screen, one or
> two lines at a time. Very visible when picture is dark, very annoying.
> It is not really specific to Myth: I see these lines on Fedora login
> screen, on my window manager screen after I log in, and in Myth
> everywhere. Interlacing options in Myth don't seem to help at all (and
> of course they would have no effect before Myth starts). The other
> problem I'm seeing is pretty strong pincussion distortion: left edge
> of the screen bends inwards. Increasing overscan helps with the
> distortion, to a degree, but the scrolling lines are unaffected. Any
> suggestions?

Sound to me like interference - particularly magnetic. You haven't just stuck 
two huge speakers next to the TV have you? Or failing that is there anything 
with a strong EM field nearby (Microwave, electric motor or spacial anomaly)?
Stuart Morgan

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