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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Fri Jul 08, 2011 11:50 am Post subject: Over 7,000 hours and still cant see any wear? |
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Why is it so? Not that im complaining... 
My 9PG has EASILY done over 2,000 hours just in playing video games this year alone. I just looked into the tubes again as i go from time to time, and there is still no sign of wear on any of the 3. It had done 4,996 hours before it went into service in this home here, and wouldve done a couple hundred hours before it made it's way to the ceiling.
Are these NEC tubes in the PG plain and PG plus just really long lasting compared to others? Its not like as if its a really small screen either, its a 120 inch 4:3, which MOST of the game consoles will fill to all 4 edges ( most are in 15.75kHz RGB-S ) .
At this rate, the projector will be well and truly rooted before these tubes are half way worn....
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Fri Jul 08, 2011 3:15 pm Post subject: |
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Lucky for you! With that big a screen I'd expect a lot more wear. Do you run the contrast really low?
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri Jul 08, 2011 3:21 pm Post subject: |
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Maybe its the games that are in the old 4:3 format and non HD resolutions?? I could see a lower scanrate being less stressful on the tubes, but I honestly don't know that for sure 
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Fri Jul 08, 2011 3:22 pm Post subject: |
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Hm, 2000 hours of games... I'm *really* surprised you don't have any burn-in from static score displays &etc.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri Jul 08, 2011 4:10 pm Post subject: |
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| garyfritz wrote: | | Hm, 2000 hours of games... I'm *really* surprised you don't have any burn-in from static score displays &etc. |
I agree, the xbox 360 dashboard burned into my old blue tube just enough to notice it on the phosphor. Nothing I can do besides not leave the projector on with the dashboard burning itself into the tubes
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When I'm asking for a Model number, that doesn't mean I'm asking for a nude photo with your number on it
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Spanky Ham
Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central
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| Posted: Fri Jul 08, 2011 6:19 pm Post subject: |
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I can't remember, but doesn't the NEC have a picture movement mode to help alleviate that static burn problem.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Sat Jul 09, 2011 7:57 am Post subject: |
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| garyfritz wrote: | | Lucky for you! With that big a screen I'd expect a lot more wear. Do you run the contrast really low? |
So would i. Im quite suprised. I wouldnt say the contrast is low myself. Its up where it needs to be to show me what i want to see, and i dont want to be looking at a dull picture.
| Jeremy112 wrote: | | Maybe its the games that are in the old 4:3 format and non HD resolutions?? I could see a lower scanrate being less stressful on the tubes, but I honestly don't know that for sure |
They are almost all at 240p 60Hz, except some PS1, some Sega Saturn, and all 3DO. That will make no difference to wear, itll just burn the scanlines into the tubes, but it hasnt yet. There is not a mark of wear to be seen.
| garyfritz wrote: | | Hm, 2000 hours of games... I'm *really* surprised you don't have any burn-in from static score displays &etc. |
I dont play the same game over and over. Im mostly playing NEO-GEO in the various forms i own it, the only thing that is really static for any duration of time is the part at the bottom that tells you how many credits youve got, and that is only on some games anyway, and not always the same looking, or even in the same place.
A round of Samurai Shodown lasts about 30 seconds tops, then there is cut scenes with no static images. Other games are pretty simular in terms of static image lengths. Metal Slug games would probably be the worst, cause the score is there pretty much 100% of the time on the AES and MVS, but on the NEO-CD machine there is a black loading screen.
| Jeremy112 wrote: |
I agree, the xbox 360 dashboard burned into my old blue tube just enough to notice it on the phosphor. Nothing I can do besides not leave the projector on with the dashboard burning itself into the tubes |
Im pretty amazed anyone could play an XboX for long enough to have it burn into a tube without getting bored to death. Im a gamer from back when games were so much fun you couldnt put them down even after you could finish them on 1 credit!!
| Spanky Ham wrote: | | I can't remember, but doesn't the NEC have a picture movement mode to help alleviate that static burn problem. |
Not that im aware of. If it was to move the picture up and down very slightly, it would be using the phosphor that was previously a black line due to the 240p signal, but i dont think it does this.
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Sat Jul 09, 2011 9:32 am Post subject: |
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Did you watch the tubes through the lenses or did you unmount them? Because hard to notice the burn on a 6-7 like condition tube when examining through the lenses.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Sat Jul 09, 2011 1:44 pm Post subject: |
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Shone a UV torch through the lens. No wear there mate, i can assure you.
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cinema mad
Joined: 25 Nov 2009
Posts: 219
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| Posted: Sat Jul 09, 2011 2:45 pm Post subject: |
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...To truly check for any visible wear you need to remove the tubes from the coupling so your looking directly at the tube face not through lenses/C elements/ Couplings.. Tube face can look pristine shining a flashlite through lenses) untill you performed the Above procedure..
There will be wear there I assure you especially if you have the contrast over 70 on up 
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Sat Jul 09, 2011 3:04 pm Post subject: |
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Here in Hungary there is a Marquee 8000 up for sale with about 8000hrs, the seller added a picture about the tubes http://kepfeltoltes.hu/110503/IMG_1311_www.kepfeltoltes.hu_.jpg if this is true maybe the PG is also burnless (the owner of the marquee asks 1000USD for that machine but it is an other story  )
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Sun Jul 10, 2011 3:14 am Post subject: |
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| cinema mad wrote: | ...To truly check for any visible wear you need to remove the tubes from the coupling so your looking directly at the tube face not through lenses/C elements/ Couplings.. Tube face can look pristine shining a flashlite through lenses) untill you performed the Above procedure..
There will be wear there I assure you especially if you have the contrast over 70 on up |
There is no visible wear, and i assure you. The contrast is at 68 on the game input, not that itll make any difference at all what the number is, the previous owner molested the G2 settings on my PG, so for all we know they could be set high or low of where they should be. So far, no one has been able to tell me how they are meant to be set to their correct settings. Obviously people know, but no one has ever replied with the answer when ive asked.
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Sun Jul 10, 2011 4:28 am Post subject: |
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| Quote: | So far, no one has been able to tell me how they are meant to be set to their correct settings. Obviously people know, but no one has ever replied with the answer when ive asked.
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It is not trivial at all how to recalibrate G2, you need a color calibrator -but perhaps maybe more equpiments...
The rumor says if all three G2s are messed up there is no way to user recalibrate the machine -at least perfectly.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Sun Jul 10, 2011 9:24 am Post subject: |
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Why would i need a colour calibrator? The 3 pots near the blue tube are what is out, and im under the impression they are meant to be calibrated to a specific voltage at a certain test point when some settings are set to what they have to be.
If this is NOT the case, then why does everyone say not to touch those 3 pots on the PG? If its just a case of turning them til all 3 tubes come on and shut off at the same level, then that is a piece of piss. The pots on the video board havent been touched.
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Sun Jul 10, 2011 9:54 am Post subject: |
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The tubes behaves all the same electronically, BUT visually every tube behaves differently, that's why cannot be specify an exact voltage level for setup. Each NEC pj was separately calibrated in the factory.
And the people saying not to touch those pots because if you mess them up YOU CAN'T REDO IT to the original shape. -simply that is the answer
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Sun Jul 10, 2011 10:17 am Post subject: |
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What does the service manual say?
If that is the case, then what do you do when you need to change a board?
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