If you take one of these "marketing bulls" as you call them, and you put a PAL dvd into them, and set the output to NTSC. If you send a PAL signal to an NTSC CRT TV, the signal will be black and white, and will roll up and down.
Lets take a CRT television as the test display (since a lot of people still use this). The OP is talking about an NTSC or north american tv, so were all assuming it has fixed resolution and refresh. So you cant say that it depends on the TV set if it will display or not.
This does not apply to plasmas and LCDs, which are insensitive to the difference in refresh rate and line difference. Any TV set rated NTSC will not display a PAL signal when it is sent to it. I am for one owner of over 400 PAL dvds, and a master of converting PAL dvds to NTSC (for obvious purposes since I live in canada). Honestly, you should just keep your mouth shut if you dont know what your talking about.
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