I took a look at my 630 and could not find a test pattern on preferences. I think I remember a set-up on my old 530 that had color bars and maybe a test pattern. Not sure about it though. That maybe before HD TV sets and HDMI became mainstream back when output could be set to channel 3 or 4 or composite video. Just my speculation...
Not sure if you get it, but KCTS PBS Seattle runs an "Engineering Test" with colour bars in the early morning some days. I just checked their schedule and it shows on Monday, September 10th, 3AM and again September 24th.
I haven't been on here in a week or so and when I came on, I saw a bunch of replies to my question! Thanks to all who had ideas and to
for colour bar places. Very helpful. :-)