All,

I have been reading this forum for a while. Have found alot of great info which led me to purchase an NEC XG1101 about a 1 1/2 years ago.

I have it mounted on the ceiling preojected on a home made silvered plexiglass screen. I am feeding it from a HTPC via a VGA to 5 component input cable. Through windows media center. Resolution is 720x1280. More or less very happy with the picture quality but...

I am seeing vertical banding specifically in my red CRT. It is particularly apparent when I have any red text or a mostly red image up on the screen. I don't seem to see this banding with either the green or the blue. But it is very pronounced in red text or with media like Ziggy Stardust concert DVD when the screen is mostly awash with red on black.

Wondering if anybody has experience with this issue on a single color. And if so any suggestions on what I might do to track down the problem and address it.

thanks,

Brandon

Is it anything like what I posted in this thread

http://www.avsforum.com/avs-vb/showthread.php?t=890673

Try (normalizing) red point convergence. Picture? Doug

It seems to be different from what was posted by zamboniman. I do not see it on a full white screen with just the red crt on.

And the banding seems to be more vertical rather than horizontal. I will reset point on red and see what happens.

If you can post a picture it would help. You might try bringing blanking in on the sides until it hits the active video image or also try H position to see if it changes. Doug

OK,

I normalized all my point last night the put on a DVD where I see alot of this banding. point didn;t seem to make any difference.

I have attacjhed a couple pictures of what it looks like. Maybe its just a de-interlacing artifact. I am running 720P on the projector. But the source material is 480. So it has to be upscales by the HTPC.

It just seems a lot more pronounced on the red CRT vs. the full picture. Although looking closely I could see alittle bit on the green as well. Could see none on the blue but iblue is defocused.

Also noticed that the artifact got worse as the projector warmed up (i.e overall picture and presumably beam sharpness got sharper)

Any thoughts based on the pics?

Brandon

looks like the Chroma bug to me, meaning this is the sources fault ;)

-Gary

You have got to try another source. Use 1080i or 720p source.
Why this photo is so fuzzy? Is it your dcam?
It seems as the XG is not synced properly or you have scrambled mess.

Very hard to tell from the photos what the heck is going on. Try swapping the red BNC with the green or blue at the projector and see if it stays on the red.
Can you also see it on the all white test pattern? Mute each color from there and see.

From the photos this is no where close to what the XG can do. Doug

All,

I am thinking that this may be a sourse issue. I have a 1080i tuner card in my HTPC and picture is crystal clear when I use card to display 1080i.

I picture I posted is pretty poor. But it is representative of the quality of the image on the DVD. Most likely due to this being a transfer of a film that was made in a dark theatre during the early 70s.

I do see this issue somewhat on some other older movies with red text. But it is most pronounced on this video (Ziggy Stardust the motion picture).

I am using media center to play my DVDs at a resolution of 720x1280 so I should already be at 720p.

Agree the XG can do much better. And it is much better with OTA HD content. But would like to get rid of these apparent motion artifacts from DVD. I will swap my blue, red and red green to see if the artifact follows the color signal.

Also can not see this on the internal all white screen on red, greeen or blue. Only evident with the video. Althought have not tried it onn an external all white source. Will give that a shot tonight.

Thanks for all your help.

Lesson learned...First thing to do when you have an issue with a display device is to try another source to rule out bad signal. Or like Doug said swap the inputs.
XG is far far more capable with SD DVD than that screen shot shows.It is not just those lines. The shot looks bad in every way. If it is not your camera you need to get the XG set up properly and/or upgrade your PC component.

looks like the Chroma bug to me, meaning this is the sources fault ;)

-Gary

Yes, it absolutely looks like CUE