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andrewsi
Joined: 17 Aug 2006
Posts: 18
Location: Redmond, WA
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| Posted: Thu Feb 17, 2011 6:45 pm Post subject: 1080p on Runco 991 Ultra (NEC XG110)? |
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I've had this projector since new back in 1998 and most of the time I'm quite happy running it at 720p or 1080i. The few times I've tried to set it up for 1080p, I always found that:
a) The picture got strangely dark
b) There was weird noise in areas of solid color.
The picture was basically unwatchable as a result. The projector is connected with some rather thick RGBHV BNC connectors, so I'd be surprised if it was a cable issue, but who knows.
I imagine someone here must have some experience with what these projectors are capable of, and I'm just wondering if there's something obvious I'm missing that will allow the projector to produce a watchable picture at 1080p, since I would think the input circuitry should be capable of handling it.
Thanks!
Andy
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Thu Feb 17, 2011 6:52 pm Post subject: |
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I agree, the circuitry should be able to handle it, and I think there are several people here running 1080p on their XGs.
It's been years since I had an XG, but... your "weird noise" comment reminded me of a problem I had with mine. I think my signal was running a bit "hot" (Vpp too high) and that overdrove the video input amps. Backing off on the signal level solved the problem.
Do you have any kind of signal preamp or anything like that, that could result in a boosted video signal? I suspect that is NOT your problem, since I don't think the image got dark when this happened to me. And I wouldn't expect it to only happen on 1080p. But I figured it was worth mentioning...
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andrewsi
Joined: 17 Aug 2006
Posts: 18
Location: Redmond, WA
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| Posted: Thu Feb 17, 2011 6:56 pm Post subject: |
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It's really been the same regardless of the source I've used - the only possible commonality I can think of is that the signal currently runs through an Extron RGBHV switch box (which I no longer need, strictly speaking, since I recently switched all sources to HDMI through a new Integra preamp and the wonderful new Moome EXTHD V3, which is now the only source of RGB input to the projector. But this problem existed even when I was using all analog component sources directly, before I had the Moome, so about the only thing left for me to try would be taking the Extron out of the equation with some BNC couplers.
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Thu Feb 17, 2011 7:14 pm Post subject: |
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It was an Extron box that boosted my signal too much. Might be worth an experiment?
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andrewsi
Joined: 17 Aug 2006
Posts: 18
Location: Redmond, WA
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| Posted: Thu Feb 17, 2011 7:16 pm Post subject: |
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Yup, I'll have to give that a shot. I'll pick up some couplers from my friendly local grumpy-electronics-guys.
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andrewsi
Joined: 17 Aug 2006
Posts: 18
Location: Redmond, WA
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| Posted: Fri Feb 18, 2011 6:52 am Post subject: |
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Problem solved. Ditched the now-superfluous Extron switch, but the real problem, the source of the noise, turned out to be picture content too far "left" in the timing. Used the remote on the Moome box to shift the picture to the right, and all the artifacts went away. I now have a beautiful 1080p picture! Seems like I just could not find a way to eliminate the artifacts using the projector controls- I had to do it with the Moome box.
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