[mythtv-users] TV Output

Stephen Williams stephen.gw at gmail.com
Fri Dec 17 13:01:00 UTC 2004

Sure, damage to the TV is possible, but not very likely! Just make
sure that you wire it all up correctly, it's a very simple circuit.

Until you're into X you'll be outputting a signal well outside of
PAL/NTSC spec (I believe the horizontal rate of your graphics card is
roughly double that of PAL/NTSC). What you'll most likely see is two
squashed images side-by-side on your TV before you get to X, or maybe
just garbage is the TV fails to sync to anything. Again, it's
_possible_ this could damage your TV, but i've never heard of this

If it's a modern TV it may not display anything and just stay blank
until it receives an in-spec signal, YMMV.


On Fri, 17 Dec 2004 11:55:21 +0000, Steve Davies <steve at one47.co.uk> wrote:
> Tom Hughes wrote:
> >In message <1e71196a041217013116c9fd02 at mail.gmail.com>
> >        Stephen Williams <stephen.gw at gmail.com> wrote:
> >
> [snip]
> >>Take a look at the following sites for details:
> >>
> >>http://www.hut.fi/Misc/Electronics/circuits/vga2tv/
> >>http://www.nexusuk.org/projects/vga2scart/index.php
> >>http://www.sput.nl/hardware/tv-x.html
> >>
> >>Personally I went for the last site listed. This will give you RGB
> >>output to the TV, you can just output the raw interlaced DVB-T signal
> >>(no de-interlacing required) and each horizontal line of pixels
> >>generated by your vid card will map natively to a scan line on the TV.
> >>
> >>
> >
> >I was looking at the nexusuk circuit, but the sput.nl one looks
> >the same anyway. Time to pay Maplins a visit I think...
> >
> >
> >
> Could someone with more experience tell me something - I am cautious of
> building a VGA -> SCART converter, but perhaps I do not need to be. It
> has always concerned me that I might send a signal that is WAY out of
> range down the wire (frequency, voltage etc), and damage some aspect of
> the TV.
> Is this possible? The TV is a reasonably recent 32" widescreen.
> How does the TV handle the text-mode signal? Does it sync well enough to
> be displayed before X kicks in, or is the boot-sequence hidden?
> Is there a site where I can read-up on this type of issue?
> Many thanks for any answers.
> Regards,
> Steve
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