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Revox
Joined: 13 Feb 2008
Posts: 158
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| Posted: Thu Oct 15, 2009 8:07 pm Post subject: White Balance Nec PG9 |
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Hi, i got problems with the WB of my NEC.
All tubes have no wear, so i think it should be possible to get a good white balance.
I got a humb at 30-50ire (10%) and the focus doesn't have an influence on that.
I know that there are a few trimpots but i don't know what functions the have?
The Defocus switch of blue ist set to ON.
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loudmouse2
Joined: 30 Sep 2009
Posts: 72
Location: Portland, Oregon
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| Posted: Fri Oct 16, 2009 6:05 pm Post subject: |
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Correct me if I'm wrong but isn't the first rule of NEC projectors Never touch the trimpots inside if you don't know their function?
White balance is controlled through the "adjust" menu isn't it?
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Revox
Joined: 13 Feb 2008
Posts: 158
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| Posted: Fri Oct 16, 2009 6:10 pm Post subject: |
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It is! But i whant to know the function, like whats behind the door of 101.
Yesterday night i got a mean setup:
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103.26 KB |
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3090 Time(s) |
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| Description: |
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Download |
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Farbmessungen2.chc |
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21.46 KB |
| Downloaded: |
155 Time(s) |
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benareeno
Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada
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| Posted: Mon Nov 16, 2009 7:43 pm Post subject: |
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with any NEC you MUST defocus blue as much as possible...this results in a flatter grey scale, and much better colors.
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Artinaz
Joined: 15 Jun 2009
Posts: 110
Location: SF Bay Area
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| Posted: Mon Nov 16, 2009 11:03 pm Post subject: |
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Does this mean that apart from setting teh defocus switch to ON, I should also manually defocus the blue ?
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benareeno
Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada
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| Posted: Tue Nov 17, 2009 1:30 am Post subject: |
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yes...to it's max defocus point.
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benareeno
Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada
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| Posted: Tue Nov 17, 2009 1:31 am Post subject: |
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I should add...this makes nec's look even better than they normally do!
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Tue Nov 17, 2009 1:31 am Post subject: |
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| Artinaz wrote: | | Does this mean that apart from setting teh defocus switch to ON, I should also manually defocus the blue ? |
Often, yes. Not always, of course, there is a large variation between NEC's, but *often* yes, more defocus of blue is needed than is provided ONLY by the Defocus switch... especially if your blue is really well setup, magnetics wise, and is capable of being very sharp when the Defocus switch is set to off.
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danOO00
Joined: 22 May 2007
Posts: 70
Location: Putnam County, NY
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| Posted: Tue Nov 17, 2009 8:37 pm Post subject: |
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Hope I am not stating the obvious to you Artinaz, but be sure to electronically defocus blue. in the focus menu.
Optical focus should have no benefit to the grayscale tracking.
BTW- the color tracking is looking pretty good- my Xtra has ~5K hours on it, and no matter how much I defocus blue there will be a little blue hump- I had to find a happy medium between blue halos and color accuracy, but it does look sweet now. I think with a bit more defocus and fiddling you can get the grayscale *slightly* better. I steped away from tweaking for a while and just watch movies now, but maybe its tie for a tune up  ....
also remember that you will likely need to touch up geometry and convergence after focus is dialed in.
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benareeno
Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada
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| Posted: Tue Nov 17, 2009 9:03 pm Post subject: |
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I agree...that's why I said MAX defocus....and I would defocus the pot, not the menu. ALthough a combination of both might help even more, but I doubt it.
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