[mythtv-users] No signal on TV with Audio Authority

Howard Cokl hojoloco at yahoo.com
Wed May 4 18:32:19 UTC 2005


--- Cory Papenfuss <papenfuss at juneau.me.vt.edu> wrote:
>  	I have seen some transcoder boxes that are picky
> on the polarity 
> of the sync signal they are sent.  Try
> adding/changing -vsync -hsync 
> +vsync +hsync at the end of the modeline.  You
> should also make sure that 
> the modeline is producing correct frequency output.
> 
>  	If it were me looking to see if it worked, I would
> put the output 
> (Y in particular) on an oscilloscope and see if it's
> got signal and sync.
> 
> -Cory
> 
>   On Wed, 4 May 2005, Mitko Haralanov wrote:
> 
> > 	Recently, I purchased a Toshiba 46H84 HDTV
> (which, according to
> > the manual, supports 480i, 480p, 720p, and 1080i).
> Now, naturally, I
> > want to get MythTV to work through my VGA port
> using a Audio Authority
> > 9A60 box.
> >
> > 	However, I am not having any success with it.
> Here are some
> > more details: I am have the Chaintech 7NIf2
> motherboard, which has a
> > nVidia GeForce4 MX440 onboard. The MB has a VGA
> and a SVIDEO output on
> > the back. Up to now, I have been using the SVIDEO
> output but now both
> > are connected - the VGA because I am working on
> it, and the SVIDEO
> > because the VGA currently does not work.
> >
> > 	The VGA port is connected to the Audio Authority
> box and the
> > box is connected to the component input of the TV.
> >
> > 	As a start, I tried using xorg.conf-HD.txt from
> Jarod's guide
> > but that did not work, so I started searching the
> archives and the web
> > for clues and help.
> >
> > 	I found numerous modelines that seemed to be
> right or that
> > worked for people with similar TVs but none of the
> work for me. The
> > result is that the TV shows nothing but a black
> screen. There isn't
> > anything displayed even during the BIOS.
> >
> > 	I tied some of the modelines on a PC monitor and
> they worked
> > fine from what I can tell but I am aware that PC
> monitor are much more
> > forgiving.
> >
> > 	Now, I bought the Audio Authority box on eBay and
> I am not
> > entirely sure that it actually work. Is there any
> way that I make sure
> > that the box is sending any signal to the TV?
> >
> > 	I would appreciate any help that you guys might
> be able to
> > offer!! I have a pcHDTV3000 on the way and I would
> really like to be
> > able to make use of it!!!
> >
> > 	Thanx in advance.
> >
> > -- 
> > Mitko Haralanov
> > voidtrance at comcast dot net
> > http://voidtrance.home.comcast.net
> > ==========================================
> >
> 
> 
>
*************************************************************************
> * Cory Papenfuss                                    
>                    *
> * Electrical Engineering candidate Ph.D. graduate
> student               *
> * Virginia Polytechnic Institute and State
> University                   *
>
*************************************************************************

Do you have twinview enabled?  Or are you trying to
troubleshoot the VGA not working with the S-video
disconnected.  I may be wrong but I think any TV can
handle a 640x480 modeline so I would try one of those
and disconnect the s-video, check xorg.conf and make
sure that Option      "TVOutFormat" "SVIDEO" is either
commentd out or removed.

Howard


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