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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Sun Jun 01, 2008 2:34 pm Post subject: Blue dot on Barco shutdown |
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This morning I noticed a blue dot in the screen center that faded away when I shut down my barco 1209s. I have never noticed it before, and it does it every time I shut it off now. Is this a sign of trouble in the future? Am I at risk of a spot burn? We had a power failure last week, could this have caused it to start doing this?
Last edited by jkruger on Sun Jun 01, 2008 6:34 pm; edited 1 time in total
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Sun Jun 01, 2008 3:05 pm Post subject: |
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Take a close look at the rasters with no signal applied. Are they all dark or is the blue tube always slightly lit with diagonal lines ?
Could be the video amp or your tube may have developed a G2 short. I had the same problem on Blue only on my BD 808 and the tube had a G2 short.
Cured it with the Sencore CR 7000. You can also swap the video amps to see if the trouble follows.
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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: Sun Jun 01, 2008 5:16 pm Post subject: |
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I'm FAR from an expert (didn't even stay at a Holiday Inn Express), but if you're seeing it on the screen, then that's pretty bright. I would be nervous about using it that way until one of the Barco guys tells you whether to worry about it or not. If you were just seeing it looking into the lens, that would be one thing. But, if you're seeing it on the screen, I'd be concerned the spot-kill isn't working properly. Maybe if it's only on the blue, then it's not a spot-kill problem... but I'd still get the info from Curt or a Barco guy before you turn it on again. Get a flashlight and look into the lens and make sure you don't already have a pinhole on your tube face.
SC
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Sun Jun 01, 2008 6:33 pm Post subject: |
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It's pretty faint, but it is on the screen. It moves and flares a little too, sometimes a fine little squiggle line like the old tv sets did.
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r.bauer
Joined: 08 Apr 2006
Posts: 280
Location: The Netherlands
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| Posted: Sun Jun 01, 2008 6:40 pm Post subject: |
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If it is really out of focus, then there is no immediate worry, but do take the trouble of finding out what's causing it.
It is a very common symptom when you have G2 problems that need fixing with a Sencore. But it could be a dying neckboard, although that is a very rare thing on a BG1209s
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Sun Jun 01, 2008 7:51 pm Post subject: |
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| Tom.W wrote: | Take a close look at the rasters with no signal applied. Are they all dark or is the blue tube always slightly lit with diagonal lines ?
Could be the video amp or your tube may have developed a G2 short. I had the same problem on Blue only on my BD 808 and the tube had a G2 short.
Cured it with the Sencore CR 7000. You can also swap the video amps to see if the trouble follows. |
The blue is dimly lit with the diagonal lines with no signal applied. No sign of any spot burn. yet.
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Sun Jun 01, 2008 8:04 pm Post subject: |
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If you have the diagional (retrace) lines it sounds like your G2 is too high.
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Sun Jun 01, 2008 8:09 pm Post subject: |
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I checked the G2, blue was good, the green was lit up, fixed that and checked red and blue. Still got the diagonal lines
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Sun Jun 01, 2008 8:23 pm Post subject: |
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Is there a safe way to shut it down in this condition? I'm not thrilled about possibly spot burning it.
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Sun Jun 01, 2008 10:03 pm Post subject: |
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If you see diagonal lines and the tube is not shutting off I doubt its the neck board. I ran my 808 for over a year with no problems or spot burn until I found a Sencore at a good price. the spot is out of focus.moving and not all that bright. G2 shorts are the easiest to fix and you don't have to pull the tube. You might want to read this as there is an alternate way to fix a g2 short but a bit more risky....
http://www.happcontrols.com/images/pdf/SencoreBlowsAwayCRTFailuresWithCR70001.pdf
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Sun Jun 01, 2008 10:26 pm Post subject: |
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I see several different models of sencore tube restorers on ebay. will any of them work?
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Sun Jun 01, 2008 11:34 pm Post subject: |
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Will the Sencore CR 70 work on these tubes?
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Sun Jun 01, 2008 11:47 pm Post subject: |
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I've only used the CR 7000 but for a G2 short the CR 70 should work fine. For the CRTs that we use the only thing that works is the universal adapter clips unless you make up a custom test socket.
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kaitsu66
Joined: 03 May 2008
Posts: 9
Location: Finland
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| Posted: Mon Jun 02, 2008 4:21 am Post subject: |
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Try service menu "run in cycless" 24 hours ,Itīs work for me in same problem.(BD808s)
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Mon Jun 02, 2008 11:19 am Post subject: |
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CR70 only has a short blaster for the G1 grid. I know, I've already used one to save three P19s and three P16s 
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Mon Jun 02, 2008 1:31 pm Post subject: |
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| kaitsu66 wrote: | | Try service menu "run in cycless" 24 hours ,Itīs work for me in same problem.(BD808s) |
Are you saying to run the tubes at full white for 24hrs? 
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r.bauer
Joined: 08 Apr 2006
Posts: 280
Location: The Netherlands
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| Posted: Mon Jun 02, 2008 4:37 pm Post subject: |
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| jkruger wrote: | | kaitsu66 wrote: | | Try service menu "run in cycless" 24 hours ,Itīs work for me in same problem.(BD808s) |
Are you saying to run the tubes at full white for 24hrs? |
Yes, but only the blue tube. It might work, but the sencore is your best option. See if there is someone with a sencore in your area.
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Mon Jun 02, 2008 9:13 pm Post subject: |
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Is there some way to simply apply a voltage across the correct pins and pop the crud off the surfaces in there without a sencore? I'm having trouble finding one in San Diego.
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Tue Jun 03, 2008 12:37 am Post subject: |
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| jkruger wrote: | | Is there some way to simply apply a voltage across the correct pins and pop the crud off the surfaces in there without a sencore? I'm having trouble finding one in San Diego. |
Charge a capacitor to about 350V, then discharge it across the correct pins. Alternatively, using VERY WELL INSULATED GLOVES you can use the G2 voltage (typically 400-600VDC) to briefly light up other grids...
Neither method I'd recommend, mind you. A little too hazardous to the tubes and to you!
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Tue Jun 03, 2008 12:46 am Post subject: |
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I've been around a lot of high voltage stuff over the years, mostly automotive ignition systems... I'm not really interested in "popping crud" of of any part of me. I like being a crusty old guy.
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