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larryp
Joined: 24 Jan 2012
Posts: 252
Location: eden prairie mn
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| Posted: Mon May 09, 2016 5:39 pm Post subject: Warm Up Time |
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When I turn my projector on I get a white screen saying the pj is warming up, 20 minutes for best performance.
If I use the pj before the warm up time is complete, Am I putting any extra wear on the crt's or other parts?
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Mon May 09, 2016 7:45 pm Post subject: |
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Certainly not causing problem if you run the projector without warming up, in fact the white warm up screen wearing the tubes.
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projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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| Posted: Mon May 09, 2016 8:15 pm Post subject: |
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Correct. White warmup screens wear the tubes faster than watching content.
It can take time for convergence/colour/brightness/contrast to stabilize on CRT projectors so that's why they have a 'warm up' screen that's mostly white as it pushes the system harder than typical content to get it to stabilize faster.
Most CRT owners I know of turn off/bypass the warmup feature. (I always did)
Kal
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Mon May 09, 2016 9:17 pm Post subject: |
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I would definitely disable that warmup screen, there's no need for it.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Mon May 09, 2016 9:17 pm Post subject: |
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| kal wrote: | | Most CRT owners I know of turn off/bypass the warmup feature. (I always did) |
This. Ditto.
SC
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Tue May 10, 2016 2:48 am Post subject: |
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I once got a nearly free Sony 1292. I think it cost me 20 bucks. Perfect condition except for two things:
Totally even raster wear due to the darned warm-up screen routine, and the raster was TINY. It probably didn't span even
2/3 of the available phosphor width.
I eventually just gave it to another forum member on here somewhere.
I never even found out how to maximize raster width on the 1292, not that I'd really want to as all that would have done is
just amplified the visible damage to the picture by showing the wear pattern.
Sony went full retard when they decided it would be a good idea to have a full white warm-up screen. Absolutely stupid.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed May 11, 2016 7:10 pm Post subject: |
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| cmjohnson wrote: | | Sony went full retard when they decided it would be a good idea to have a full white warm-up screen. Absolutely stupid. |
more likely a ploy to sell more tubes 
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Thu May 12, 2016 4:46 pm Post subject: |
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That kind of makes me wonder, of all CRT projectors ever made, what percentage of them actually got retubed before they were scrapped? My guess is that any projector used in a simulator always gets retubed, and any projectors used for other applications rarely gets retubed.
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