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Bert Randolph
Joined: 03 Jul 2007
Posts: 81
Location: Germany
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| Posted: Fri May 15, 2009 11:38 am Post subject: Can this be a burned tube? |
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I am currently looking at a Sony 1292. The seller tells me that "the green tube has a circular burn in".
In the two pictures below I can see absolutley nothing on the tube face, but there is a strange circle in the projected image.
Does anybody have an idea, what this could be?
Thanks,
Daniel.
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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: Fri May 15, 2009 12:54 pm Post subject: |
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Yes, that is phosphor wear. Too light to be seen on the tube face, but visible on the screen. 
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Bert Randolph
Joined: 03 Jul 2007
Posts: 81
Location: Germany
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| Posted: Fri May 15, 2009 1:29 pm Post subject: |
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Hmm, too bad.
This seems to be a very strange wear pattern to me. I wonder what was projected to cause such a pattern. Especially since, according to the seller, there are only 900 hours on the tubes.
Are green tubes for the 1292 hard to find?
So long,
Daniel
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Fri May 15, 2009 1:42 pm Post subject: |
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Not it's not Curt.
Pay attention.
That is the dreaded 1292 Phosphur Delamination ring.
The tube is dead.
But it's C element is valuable - don't let it get discarded.
And yes, 1292 greens are moderately hard to find. Not impossible, but because of the phosphur delamination issue, among other things, they are a bit rare.
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nuttall_chris
Joined: 08 Mar 2006
Posts: 832
Location: Ottawa, Ontario, Canada
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| Posted: Fri May 15, 2009 1:42 pm Post subject: |
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| Curt Palme wrote: | | Yes, that is phosphor wear. Too light to be seen on the tube face, but visible on the screen. |
Wow, you really think that's tube wear? I've never seen a tube that shows that much difference on the screen and and have no visible wear on the tube. Could this be a problem with the lense. I would try swapping around the lenses between the tubes to see if the problem follows the lense.
Chris.
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Bert Randolph
Joined: 03 Jul 2007
Posts: 81
Location: Germany
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| Posted: Fri May 15, 2009 2:26 pm Post subject: |
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| Mark_A_W wrote: |
That is the dreaded 1292 Phosphur Delamination ring.
The tube is dead.
But it's C element is valuable - don't let it get discarded.
And yes, 1292 greens are moderately hard to find. Not impossible, but because of the phosphur delamination issue, among other things, they are a bit rare. |
Okay, that explains it. I will stay away from the machine. Thanks for the input, guys!
Daniel.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Fri May 15, 2009 2:29 pm Post subject: |
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| Mark_A_W wrote: | Not it's not Curt.
Pay attention.
That is the dreaded 1292 Phosphur Delamination ring. |
I have t oadmit I don't read a lot of Sony threads but still I would have expected to have heard that term before, today is the first time.  It almost sounds like a Monty Python joke. Doesn't Athanasios have a truck load of these tubes?
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Fri May 15, 2009 2:35 pm Post subject: |
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I've heard of a few.
Graham had one, and tried to get sony to replace it as faulty. They didn't play ball IIRC.
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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: Fri May 15, 2009 2:39 pm Post subject: |
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| Mark_A_W wrote: | Not it's not Curt.
Pay attention.
That is the dreaded 1292 Phosphur Delamination ring.
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Interesting, I have not seen delamination like that before. I've seen two delaminations on Sony green tubes, both had actual peeling back of the phosphor, not the way it shows in the above image.
But good to know. 
I have however had a number of tubes where the phosphor looks minty to the eye as well as to the camera, but you'd see it on an all white field.
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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Fri May 15, 2009 3:04 pm Post subject: |
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I would buy the projector if it were cheap just for the C element.
craigr
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HaydnG90
Joined: 22 May 2006
Posts: 1356
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| Posted: Fri May 15, 2009 3:33 pm Post subject: |
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| CIR Engineering wrote: | I would buy the projector if it were cheap just for the C element.
craigr |
And don't the magnetics have some value too
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Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
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| Posted: Fri May 15, 2009 3:42 pm Post subject: |
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| HaydnG90 wrote: | | CIR Engineering wrote: | I would buy the projector if it were cheap just for the C element.
craigr |
And don't the magnetics have some value too |
Yes. A 1292 is easy to sell (tubes, c-elements, magnetics, lenses) unless it's a whole projector. 
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antorsae
Joined: 16 Jul 2006
Posts: 297
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| Posted: Fri May 15, 2009 3:46 pm Post subject: |
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Clarence - OT: what a nice picture gallery you have with the 500d....
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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: Fri May 15, 2009 3:49 pm Post subject: |
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I'm surprised nobody mentioned this... If you look at the "screenshot" (heh heh)... The big circle shows a predominance of green or blue-green or a lack of red... That can only mean one of two things: 1) The green tube is burnt around the outsides with a big circle of unused/less-worn phosphor in the middle - which makes no sense, of course (and the photo of the green tube verifies), or 2) The RED tube is the one with the problem.
The latter would be my guess. I'd like to see a photo of the red tube.
SC
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Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
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| Posted: Fri May 15, 2009 3:52 pm Post subject: |
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| antorsae wrote: | | Clarence - OT: what a nice picture gallery you have with the 500d.... |
Thanks Andres. That's my latest toy... I bought it on a whim when I sent my 40D back for a shutter replacement. I like it.
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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Fri May 15, 2009 4:12 pm Post subject: |
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| ecrabb wrote: | I'm surprised nobody mentioned this... If you look at the "screenshot" (heh heh)... The big circle shows a predominance of green or blue-green or a lack of red... That can only mean one of two things: 1) The green tube is burnt around the outsides with a big circle of unused/less-worn phosphor in the middle - which makes no sense, of course (and the photo of the green tube verifies), or 2) The RED tube is the one with the problem.
The latter would be my guess. I'd like to see a photo of the red tube.
SC |
HA! You are correct. We need to see a photo of the red tube. A red tube will certainly be easier to find than a green... at least I would think.
craigr
_________________
JETI 1501-HiRes 2nm Spectroradiometer
JETI 1211 Spectroradiometer
Photo Research PR-650 Spectroradiometer
Klein K10-A Colorimeter
Murideo Fresco SIX-G HDMI 2.x Multimedia Generator
Murideo Fresco SIX-A HDMI 2.x Analyzer
Light Illusion ColourSpace XPT Color Calibration Software
Light Illusion LightSpace XPT Pro Version 10.x Color Calibration Software
OMARDRIS JVC Software Patch to use K10-A and Jeti with JVC OEM AutoCal Software!
Sencore CR7000 CRT Tube Analyzer / Rejuvenater
Authorized Dealer for Lumagen & just about everything worth buying
www.CIR-Engineering.com - craigr@cir-engineering.com
Phone: 865-405-6892
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Fri May 15, 2009 4:14 pm Post subject: |
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| ecrabb wrote: | I'm surprised nobody mentioned this... If you look at the "screenshot" (heh heh)... The big circle shows a predominance of green or blue-green or a lack of red... That can only mean one of two things: 1) The green tube is burnt around the outsides with a big circle of unused/less-worn phosphor in the middle - which makes no sense, of course (and the photo of the green tube verifies), or 2) The RED tube is the one with the problem.
The latter would be my guess. I'd like to see a photo of the red tube.
SC |
I'd like to see all 3 tubes.
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Bert Randolph
Joined: 03 Jul 2007
Posts: 81
Location: Germany
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| Posted: Fri May 15, 2009 4:49 pm Post subject: |
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| ecrabb wrote: | I'm surprised nobody mentioned this... If you look at the "screenshot" (heh heh)... The big circle shows a predominance of green or blue-green or a lack of red... That can only mean one of two things: 1) The green tube is burnt around the outsides with a big circle of unused/less-worn phosphor in the middle - which makes no sense, of course (and the photo of the green tube verifies), or 2) The RED tube is the one with the problem.
The latter would be my guess. I'd like to see a photo of the red tube.
SC |
I asked myself the same question.
Well, I have pictures of the other tubes (not very good ones), but there is nothing to be seen on them
D.
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Fri May 15, 2009 7:41 pm Post subject: |
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Turn the brightness and contrast down, Remove the lenses. Do you see anything on the tube face that would account for this while projecting a full White image ?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri May 15, 2009 7:51 pm Post subject: |
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Its a water spot on the lens........... 
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