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gcom007
Joined: 26 Aug 2007
Posts: 112
Location: Beverly Hills, Michigan
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| Posted: Wed Nov 26, 2008 4:34 am Post subject: Pop Goes the Barco 1208s/e: blue tube implosion... |
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Update 2: Blue tube imploded. I'm going to go Office Space on my projectors to celebrate Thanksgiving.
Update: I swapped out everything, even re-soldered in another HV Splitter. No luck. So still seeing no light-up on blue, I disconnect its HV lead and power up. What do you know...and wonder puke yellow tint screen. In fact, I'm typing on it now. So I'm assuming this means blue is shorted out. How? Why? What now? And on that note, if it's got white/yellow tabs inside, is it not a high-res tube? It's a PT18-205. The green and red are white/white.
Just a few minutes my Barco made a pronounced popping sound and at once the video was gone and immediately heading in and looking to the lower right, the EHT boards lit up top and middle.
As I have an extra set of parts, I swap out EHT first real quick to see if it's that. Same red lights on board, no picture.
Next I throw in another SMPS board. Same red lights on EHT and no picture.
I'm going to dig a bit deeper and swap out the H shift board in a sec as the troubleshooting section suggests.
But my question is this, even if I get it working if it's H-shift or something else rather simple, what ought I to do/check to make sure this doesn't happen anymore? On top of that, this is now set number 2 in a matter of days (recall my NEC PG10 thread...) that has lost picture and lit up nice and red. Could there be an external issue at play here such as the power coming in? While it's not on it's own line yet (project for this weekend or Christmas break...), the line shouldn't be too taxed and I've got a Brickwall Line Conditioner/Surge Suppressor on it as well. But two projectors in a few days seems odd to me.
_________________
-Elliot
Barco 1208s/e
Last edited by gcom007 on Wed Nov 26, 2008 9:20 am; edited 2 times in total
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Wed Nov 26, 2008 5:04 am Post subject: |
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Got an extra HV quadrupler ? If so try it and see what happens...
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gcom007
Joined: 26 Aug 2007
Posts: 112
Location: Beverly Hills, Michigan
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| Posted: Wed Nov 26, 2008 5:12 am Post subject: |
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Actually, the quad is the only part I don't have a spare for anymore as my spare is now my main.........
Also, no red lights anywhere else inside. Forgot to mention that. Just EHT. Back to the basement to play...
_________________
-Elliot
Barco 1208s/e
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Wed Nov 26, 2008 5:17 am Post subject: |
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Can you hear the high voltage come up on the tubes ? Kind of a crackle noise. Sounds like you need another quad. Have you tried removing the quad from the high voltage splitter to see if the Red LED goes out on the EHT module ?
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gcom007
Joined: 26 Aug 2007
Posts: 112
Location: Beverly Hills, Michigan
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| Posted: Wed Nov 26, 2008 6:10 am Post subject: |
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I'm hearing high voltage and the red and the green tubes are lit where connected to the neckboard. However, the blue is not lit. I've swapped out just about every board besides the switcher board. I swapped out the neckboard on the blue tube for the hey of it. Nothing.
Does this mean I need to mess with the HV Splitter?
_________________
-Elliot
Barco 1208s/e
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gcom007
Joined: 26 Aug 2007
Posts: 112
Location: Beverly Hills, Michigan
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| Posted: Wed Nov 26, 2008 9:19 am Post subject: |
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Well, now it's quite obvious what the problem was. The blue tube imploded! Outstanding. I am so happy I can hardly stand it. I didn't even look into the lens before I took the whole thing off. I thought I'd wait. I take the tube out and unscrew it from the lens mounting assembly and there it is. Minty phosphor no more...giant cracked, devastated phosphor instead. Why?
And it's definitely white/yellow which I thought was not high res despite the fact that I was told it was.
Now I've got to put old burn in P16 tube back in until I can find a replacement or I light the thing on fire. After this week, I'm beginning to think digital may not be such a horrible option after all.
_________________
-Elliot
Barco 1208s/e
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Wed Nov 26, 2008 12:33 pm Post subject: |
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| gcom007 wrote: | Well, now it's quite obvious what the problem was. The blue tube imploded! Outstanding. I am so happy I can hardly stand it. I didn't even look into the lens before I took the whole thing off. I thought I'd wait. I take the tube out and unscrew it from the lens mounting assembly and there it is. Minty phosphor no more...giant cracked, devastated phosphor instead. Why?
And it's definitely white/yellow which I thought was not high res despite the fact that I was told it was.
Now I've got to put old burn in P16 tube back in until I can find a replacement or I light the thing on fire. After this week, I'm beginning to think digital may not be such a horrible option after all. |
I'm parting out a 1208/2... Let me see if I can find the tube face pics I took. If not, I'll take some more tonight.
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"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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Z-Photo
Joined: 07 Mar 2006
Posts: 2749
Location: Huntsville - Alabama
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| Posted: Wed Nov 26, 2008 2:04 pm Post subject: |
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Ouch -
thats very unusual - but blues are fairly easy to find
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Engineer by Day
Photographer by Night
My Portfolio
The Only GOOD AMPRO - is a Dead AMPRO.
wait - are they not all DEAD already?
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gcom007
Joined: 26 Aug 2007
Posts: 112
Location: Beverly Hills, Michigan
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| Posted: Wed Nov 26, 2008 3:04 pm Post subject: |
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When you know you weren't pushing H-Width (if anything too small at the time...) and you know you had a nice bubble (tubes just swapped in a couple months ago with a liberally sized bubble...) what do you look at as the cause of implosion?
_________________
-Elliot
Barco 1208s/e
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Z-Photo
Joined: 07 Mar 2006
Posts: 2749
Location: Huntsville - Alabama
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| Posted: Wed Nov 26, 2008 3:06 pm Post subject: |
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Even with bubbles in the chamber the glycol will build up pressure if moisture gets in.
I have had tubes shoot glycol over the room upon removing the drain screw - they all had bubbles.
_________________
Engineer by Day
Photographer by Night
My Portfolio
The Only GOOD AMPRO - is a Dead AMPRO.
wait - are they not all DEAD already?
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gcom007
Joined: 26 Aug 2007
Posts: 112
Location: Beverly Hills, Michigan
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| Posted: Wed Nov 26, 2008 3:12 pm Post subject: |
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It just seems odd. It's the winter here now fully and between that and a dehumidifier still running, the basement is almost too dry. There's very, very low humidity down there lately.
_________________
-Elliot
Barco 1208s/e
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Z-Photo
Joined: 07 Mar 2006
Posts: 2749
Location: Huntsville - Alabama
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| Posted: Wed Nov 26, 2008 3:51 pm Post subject: |
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Glycol is a water sponge - once it absorbs water it will not let it go.
_________________
Engineer by Day
Photographer by Night
My Portfolio
The Only GOOD AMPRO - is a Dead AMPRO.
wait - are they not all DEAD already?
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gcom007
Joined: 26 Aug 2007
Posts: 112
Location: Beverly Hills, Michigan
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| Posted: Wed Nov 26, 2008 4:20 pm Post subject: |
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I'm not 100% sure this is true, but I may have already decided in the back of my mind to sell off all my CRT stuff and go digital...
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-Elliot
Barco 1208s/e
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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: Wed Nov 26, 2008 4:39 pm Post subject: |
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IT would indeed be a shame to get rid of that set, but if you do, email me, I'd like some parts out of it.
Curt
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gcom007
Joined: 26 Aug 2007
Posts: 112
Location: Beverly Hills, Michigan
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| Posted: Wed Nov 26, 2008 10:00 pm Post subject: |
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| Curt Palme wrote: | IT would indeed be a shame to get rid of that set, but if you do, email me, I'd like some parts out of it.
Curt |
In many ways I hate the idea of getting out of CRT but I feel like they're starting to get too distracting on top of them breaking down. Even when I got the Barco looking great, I'd reset it completely down to astig and start from scratch again to try and make it better. I don't have time for that really. I can't say I'd be as satisfied with a digital by a long shot (and it's so not in my nature...) but the more time and money I spend, the more I kinda just want to dial things back a bit.
But anyways, do you have any other ideas why the tube may've imploded? Is it bad to run high-res into low res-tubes? Again, I didn't pay as close to attention to it before and it's a PT18-186 white/yellow which I believe to be a low-res tube despite being told I was buying 3 PT18-205 high-res tubes. The red and green are PT18-205's. I always felt like something was off with the tube as at best it never focused well. It was one of the reasons I kept resetting the astig and I assumed I'd get it solid when I had more time on a break. Even at 720P it didn't seem to ever want to focus well though. Hell, 480P seemed mediocre but you know it's blue so it didn't hurt things too bad with video.
_________________
-Elliot
Barco 1208s/e
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