[mythtv-users] Troubleshooting a VGA-SCART converter
andrew.cranwell at gmail.com
Sun Oct 2 14:20:06 UTC 2011
Trying to not spend money on a new TV, I thought I'd try VGA-SCART.
Per http://www.mythtv.org/wiki/RGB_Scart and
http://www.nexusuk.org/projects/vga2scart/ I've been trying to connect a
new system (so far running from a livecd) with an NVIDIA GT520 card to
an old CRT via the sync-converter circuit described, without much success.
I suspect the first problem is that the scan frequencies are simply too
high - X doesn't seem to accept the 15.6kHz modelines (from
http://www.mythtv.org/wiki/Modeline_Database) but will use the 31kHz
non-interlaced modes - hopefully this will actually work as the TV can
supposedly take 100Hz progressive input.
RGB is selectable as an A/V mode (though I did try the secondary select
I've at least got RGB wired through correctly, but sync is eluding me
(the image is blocky and madly scrolling everywhere).
Has anyone got some suggestions on what I should be looking for to test
this? I'm reading through the following for advice:
I'm also trying to get hold of a CRO to test what's going on, but I'd
like some advice on what to do - should I
a. persist with/modify the circuit (e.g. to sync-on-green?)
b. buy a VGA-composite converter
c. buy a suitable NVIDIA card (e.g. 8600GT) & use either VGA/SCART or
d. give up and buy a new TV
e. something else?
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