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jbmeyer13
Joined: 03 Dec 2010
Posts: 1135
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| Posted: Mon Oct 03, 2011 3:15 pm Post subject: HDM ringing and short retrace |
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HDM ringing is a rather annoying artifact that I'm looking to rid myself of. It shows up when running 1080p@60Hz on short retrace in my 9500LC. After talking with Steve Flynn over at Hi-Rez a few months back he advised that this issue effects about 7 of 10 HDM's. Apparently there have been multiple versions of the HDM produced over the years with most suffering from this issue. When Hi-Rez used to offer their Crystal view 9500LC clone they would test and hand pick HDM's, therefore it's not as simple as picking units produced after/before a certain date or with a certain serial number. It boils down to testing multiple modules..
I seem to remember reading that a Lumagen Radiance could solve this problem by adjusting the porch settings, thereby allowing the short retrace setting to be used. Can anyone confirm that they were able to run short retrace and eliminate HDM ringing by using a Radiance?
Aside from having someone ship a truck load of HDM's to test, are there any other options?
Thanks,
Justin
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Mon Oct 03, 2011 3:29 pm Post subject: |
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yes, set backporch to 1.7 or 1.8 us via a processor or pc and powerstrip or other customizable software.
i think all hdm modules exhibit this problem, maybe one more then the other but ringing is always there without enough retrace time.
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marquee 9500ultra HD10L moome hdmi1.3 v3+ some mods.
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Mon Oct 03, 2011 4:48 pm Post subject: |
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Yes remove the varible rate resistors.,and replace with jumpers. The VRR's are the width slugs on the HDM. If your runnning 1080p only, they are not needed anymore.
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jbmeyer13
Joined: 03 Dec 2010
Posts: 1135
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| Posted: Mon Oct 03, 2011 7:02 pm Post subject: |
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Catch22. I could only run 1080p exclusively if I had a Radiance or similar video processor since cable comes in at 720p and 1080i. So either I ditch the cable box or buy the vp.
Dturco- have you actually removed the vrr and replaced with jumpers?
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Projector: Modded 9501LC ULtra- MP VIM, Vold VNB, ETECH LVPS, Silver VIM Cables, HD10F's & a V1 case!
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Mon Oct 03, 2011 10:11 pm Post subject: |
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| jbmeyer13 wrote: | Catch22. I could only run 1080p exclusively if I had a Radiance or similar video processor since cable comes in at 720p and 1080i. So either I ditch the cable box or buy the vp.
Dturco- have you actually removed the vrr and replaced with jumpers? |
Yes, I have removed the VRR's.... weelll......I had it done. The picture is much more stable without them. I use 1080p exclusively without a VP. I just use the scaling in my Onkyo 885. Since I don't watch T.V through my projector I only have to deal with up-scaling DVD's.
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Firefly rules. Can't stop the signal.
http://www.hulu.com/firefly
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mr_ro_co
Joined: 08 May 2006
Posts: 1643
Location: Santa Fe NM
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| Posted: Tue Oct 04, 2011 12:21 am Post subject: Re: HDM ringing and short retrace |
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| jbmeyer13 wrote: | HDM ringing is a rather annoying artifact that I'm looking to rid myself of. It shows up when running 1080p@60Hz on short retrace in my 9500LC. After talking with Steve Flynn over at Hi-Rez a few months back he advised that this issue effects about 7 of 10 HDM's. Apparently there have been multiple versions of the HDM produced over the years with most suffering from this issue. When Hi-Rez used to offer their Crystal view 9500LC clone they would test and hand pick HDM's, therefore it's not as simple as picking units produced after/before a certain date or with a certain serial number. It boils down to testing multiple modules..
I seem to remember reading that a Lumagen Radiance could solve this problem by adjusting the porch settings, thereby allowing the short retrace setting to be used. Can anyone confirm that they were able to run short retrace and eliminate HDM ringing by using a Radiance?
Aside from having someone ship a truck load of HDM's to test, are there any other options?
Thanks,
Justin |
I have a Radiance and have been wanting to look into how this is done! I hope someone chimes in. That ringing really gets on my nerves sometimes.
Steve
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zGman
Joined: 22 May 2006
Posts: 599
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| Posted: Tue Oct 04, 2011 1:48 am Post subject: |
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It is just a matter of adding more "backporch", it gives the beam a chance to settle.
You may need to adjust Hphase to compensate for centering.
G
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Tue Oct 04, 2011 9:12 pm Post subject: |
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| dturco wrote: | | Yes remove the varible rate resistors.,and replace with jumpers. The VRR's are the width slugs on the HDM. If your runnning 1080p only, they are not needed anymore. |
I believe those are inductors and not resistors 
IT's one the many features on the marquee that shouldn't even be there in 2011, same goes for the relays which switch between the low and hi-band coils.
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mr_ro_co
Joined: 08 May 2006
Posts: 1643
Location: Santa Fe NM
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| Posted: Tue Oct 04, 2011 9:30 pm Post subject: |
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| zGman wrote: | It is just a matter of adding more "backporch", it gives the beam a chance to settle.
You may need to adjust Hphase to compensate for centering.
G |
I guess I need to RTFM and find out how to do this with the Radiance.
Steve
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