1) I assume it's ok to have a little bit of a light (glow) emmit from the tube even if you have your source, let's say DVD player, off? I assume so.
If you turn all your ambient light off, and wait till your eyes adjust to the dark, then yes, you probably should see a slight glow from scanned areas (to borrow Ken's term) of the screen, even with a totally black picture. You may even see a slight glow from unscanned/0-voltage areas. IMO though you should not really be able to see a detectable difference in black between the scanned and unscanned areas with your ambient light on. Just my 2c. YMMV. The "pedestal of grey" may be your best gauge though. If blacks in dark scenes look more like a very dark grey than black, then your Brightness may be a little too high. Some TVs (especially ones with badly adjusted grey scales) may lose too much shadow detail set this way though.
2) My DVD player is upscaling to 1080i and I believe the TV is using the HD color matrix (SMPTE 296M), but my Zenith is using the SD color matrix (SMPTE 170M). I can go into the CXA2171 menu and change the MTRX from 1 to 0 and that will treat 1080i sources with the SD color matrix (someone found this out with their Sony TV), but it also treats C6 that way too and I have a HDTV tuner and it uses the HD color matrix. The differences seem subtle, but does anyone know a SM item that might correct this for my C5 1080i source only? TIA
That's an excellent question, Hef. This is an issue that I have only recently begun to delve into a bit myself, so take anything I have to say on this subject with a very large grain of salt... but I guess the developing consensus is that the player or video input device should make the necessary color adjustment when outputting 720p/1080i, to accomodate the HD color space on the TV.
I don't think I've run across an input level adjustment for the HD color space on my 34XBR800 so far, but that doesn't mean that there isn't one hidden somewhere else in the various codes. If noone else has an idea on this, then Sony's Non-Authorized Service Tech Support might be able to give a more definitive answer.
Since you brought the issue of different color spaces up...
***A word of advice regarding CXA2171/MTRX-- On my 34XBR800, this item does not work like most of the other SM items with respect to saving and recalling from memory. It appears to be one of a handful of settings which are memory-independent.***
In addition, I wouldn't be surprised if the CXA2171/CBGN, CRGN, YGN offsets were designed expressly for the purpose of making minor adjustments to color decoding between the SD and HD color matrices. (This is something we touched on a bit earlier in the thread.)
I'm not sure what the original MTRX setting was on my TV anymore, but somehow it also ended up at 0
If you can input color bars or a pattern like this
at 33.75khz (1080i or 540p), then you can clearly see the changes in color decoding between the different MTRX settings by switching different color guns on and off with 2170P-2/RGBS.
Is there any chance Zenith might release a firmware update to correct any potential color issues on their 720p/1080i output?