[mythtv-users] My TV doesnt like input from computers

Marco Nelissen marcone at xs4all.nl
Tue Apr 11 02:53:14 UTC 2006

>I have a bit of a weird problem with my TV. When it takes input from a
>computer, the image is never quite right. It seems (for lack of better
>words to describe it), that the horizontal stretch is off. That is,
>the image pulls away from the sides of the tv (left and right), to
>leave a few cm (sometimes more then 5cm) of black space on either
>side. This gap isnt consistant either - it varies depending on the
>brightness of the image being shown. And if the brightness varies for
>the current image (say the top is bright, and the bottom is dark), the
>gap at the sides varies to.

I've seen this with many CRTs, even computer monitors, or TVs with
non-computer images. It's certainly not something that's specific
to feeding a computer signal to a TV.
Basically, the horizontal deflection voltage isn't stable and being
influenced by picture brightness. It could be that the signal you're
providing is simply too bright for the powersupply to supply adequate
voltage to all its sub-circuits. Try reducing the brightness and see
if the problem goes away or is reduced to acceptable levels. If not,
your TV's power supply may need to be repaired. If you don't want to
spend the money on repair, you could try making the problem less
obvious by dialing up the image size until the gap is no longer

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