There are 3 issues regarding regions/video standards.
The region code stops the DVD player from playing a disc based on the
content providers desires (ie, wanting to screw everybody, but that is
a different thread!!)
If the content provider only wants the content to be played in the USA
(region 1) then the region code will be set to 1. The disc can be
encoded as PAL, which really means 720x525 pixels at 25 frames per
second, or as NTSC, which is 720x480 pixels at 30 frames per second.
The encoding has no relationship to the region necessarily.
Now... the DVD player is free to generate a CVBS video signal in
whatever standard it wants, but most likely NTSC for region 1 players
etc... But... it doesn't have to, regardless of the region of the
disc, or the encoding of the content.
USUALLY, region 1 discs are played on region 1 DVD players, in the USA
and generate NTSC CVBS video signals. But they don't have to...
Therefore, the three variables, which can be mixed in any way are
1) The region code of the disc
2) The format encoding of the content
3) The output video standard of the DVD player.
When you watch the video content through the CVBS signal, which is
usually the yellow connector on the back of an NTSC DVD player, the
video signal has horizontal timing, vertical timing and color
modulation all encoded onto the single wire. The biggest issue is the
color modulation, which is substantially different for PAL and NTSC.
The horizontal and vertical timings are often close ebough for many
TVs to lock, giving a stable picture, but since the color modulation
schemes are wildly different you get no color.
Now, is it possible for you to look at the component output of your
DVD player? Component does not have any color modulation, so if this
works on your TV, then it is the color sub-carrier that is causing the
problem, and hence likely that your DVD player is auto switching the
OUTPUT video standard. Not, as I said earlier, that this can be
different from the region of the disc, AND the encoding format.
Hope this is a little interesting, if not helpful
Kind regards,
Steve