CurtPalme.com Home Theater Forum

wallace123456 · Joined: 14 Aug 2006 Posts: 2236 Location: Northwest VA area

Ok, really I have 2 questions:

1 - The pic is of a nec 6pgxtra. Al settings have been zeroed out, blanking wide open. The source is xa2 set for 720p, going thru a moome ext box. To make maters worse, when I center the image inside the raster, then strech it fill the raster, the image really gets out of whack. Horz and Vert lines from the center are not straight. Is this common and I just need to try to correct with key, pin, etc, etc, etc? (Also, I tried with a PS3 source, and same odd raster shape.)

2 - When I try to take a pic of the tube, there is somewhat of a scrolling bar from bottom to top. When I took pics of my sony 1272, there was nothing like that. (But, I did not have the moome box in the video path either.)

thanks.

wallace

Mark_A_W · Posted: Thu Apr 17, 2008 5:12 am Post subject:

Try it without the Moome, with a PC or something.

**AnalogRocks** · Posted: Thu Apr 17, 2008 6:18 am Post subject:

I'd suspect signal timing's. That look's sorta like what my Ampro was doing with the Moome card in teh Sony 1271 switcher. I added an Extron 202 box and when I shifter the image to the right the picture got brighter.

Yes do try with a regular VGA connection.

wallace123456 · Joined: 14 Aug 2006 Posts: 2236 Location: Northwest VA area

I'll get another dvd player and use the s-video connector.

Also, the scrolling bar is only visable thru the camera. When looking at the tube (no lens), or the image that is displayed on screen, you can't see the scrolling effect. Is it my cheap-o kodak camera? Seems strange that it would only do it on this projector, and not the other sonys I have.

wallace

dbaisey · Posted: Thu Apr 17, 2008 11:53 pm Post subject:

For one thing the phase isnt set for the 720P signal and you will need to start from scratch with convergence. Do the signal entry from the temporary line, set amplitude then do the convergence. Do phase first. Doug

wallace123456 · Joined: 14 Aug 2006 Posts: 2236 Location: Northwest VA area

I tried using a Pany RP-56 with s-video to the nec. I disconnected the RGBHV leads and only had the s-video input from the Pany. The pic is still wavy or the same as was using the moome ext box, and RGBHV from the xa2/PS3.

I have another nec 6pgxtra but with burnt blue and green tubes. So, I pulled that out, hooked it up to the Pany via s-video and also via the moome ext box from the xa2. The horz and vert lines are staright as an arrow, but there is still some wavyness to the outter edges. All settings on this pj were also set "zeroed out". The phase did not have to be changed only but a very small amount. I was able to get a good square raster and image with a little keystone and pin adjustments.

dbaisey · Posted: Fri Apr 18, 2008 4:16 pm Post subject:

Shapes from your photos:
Phase affects the top and bottom line shape or curve. Some Extras also had what we called S curve that affects the sides.

If you cant get rid of the side curve try 1080I. I have done mods to the deflection timings for 720P in the past but it will reduce the width just a bit. Easier to correct if you can run 1080I.

dropzone7 · Joined: 12 Jun 2007 Posts: 1069 Location: Charlotte, NC

I never had much luck getting 720p looking right on any NEC I have had. Probably could have gotten it there but 1080i was just so much easier as Doug says. It really seems to be the sweet spot for these projectors.

overclkr · Joined: 08 Mar 2006 Posts: 4227

wallace123456 · Joined: 14 Aug 2006 Posts: 2236 Location: Northwest VA area

dropzone7 · Joined: 12 Jun 2007 Posts: 1069 Location: Charlotte, NC

**AnalogRocks** · Posted: Tue Apr 22, 2008 1:47 am Post subject:

It's the difference in shutter timing to the refresh rate of the projector.