Originally posted by tommylotto
Okay. I have been playing with the service menu adjustments for a while now. They are NOT independent for each input. I believe there is a different set of settings for each resolution -- 1080i, 480i and 480p. My component input is connected to a Zektor component switch, which is connected to HD Tivo, Momitsu and Play Station. I have my laptop/music server connected via S-video. The laptop at 480i has intentional underscan leave a black border. I was afraid of burn in, so I adjusted it to have the desktop match the screen. The changes I made for S-Video 480i were also made on the component input when using 480i. However, the component input has separate setting for 480i and 1080i. I assume it also has separate settings for 480p.
Once I figured this out, I set both 480i and 1080i to the minimum overscan. I then switched back and forth from 480i to 1080i on the HD Tivo. I can confirm that there is less picture (more inherent overscan) with 1080i. I can also confirm that there is still a slight barrel roll effect on 1080i when displayed with minimum overscan, though not as bad as 480i.
I haven't played with the service menus very much, and it hasn't been clear to me how you set each of the modes. The service manual glosses over this procedure. Can you describe in a step by step manner what you did to adjust each scan rate (video mode)? Do you input a scan rate on the service menu, then make adjustments, then switch to the next? Or does the set autodetect the present video source scan rate, and adjust it? (i.e. Do you tell it which scan rate you want to adjust, or does it default to adjust the existing scan rate present on the video input?)
I think some of the confusion that is existing over the service menu adjustments (and hence barrel roll) has to do with the fact that the picture adjustments (brightness, sharpness, color, black level, etc.) are independent for each video input source (Video 1, 2, 3, Front, Ant A/B, Sat, Component). I think people are assuming that the service menu works the same way.
It seems, though, that the service menu adjustments are NOT tied to the input source at all, but to the scan rate (480i, 480p, 1080i) and are interdependent for the three scan rates. People are mixing these two adjustments up (or are assuming that service menu adjustments act the same as picture adjustments).
I think, once we are all satisfied that we understand what is going on, I'll need to make an update to the FAQ on this subject.