I have the 240p suite on SD card, is there a video or guide to using this? I went through it but didn't see anything for RGB.
When I check the limited box, everything gets lighter. Blacks get gray and all the colors get duller. Does this mean I should keep it off?
Test Patterns > Pluge. On the left and right sides, there are 3 vertical bars. The outermost bars are dark grey, the inner ones are blue, which can be toggled to green, red, or grey by pressing X. If you can't see all three bars, and you still can't after turning up "brightness" on your TV, you probably need limited RGB range.
Second test: Test Patterns > Color Bars. You should be able to see the gradients increase all the way up to the last one, labeled "F". If you can't see the gradients all the way up to F (even on white), try turning down the "contrast" on the TV, if you still can't see all the gradients from 0 to F, try limited RBG range.