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capa
Joined: 22 Oct 2007
Posts: 33
Location: Hamburg, Germany
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| Posted: Tue Sep 16, 2008 7:54 pm Post subject: No luck so far :( |
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Hi all.
Curt, thanks a lot for your fast service it all went very smooth (I think you were to busy to notice the picture postcard I had added for you, it came back to me as well...)
Was happy as hell when the spare parts got here and installed them this evening...
But the problem persists 
Same noise (changing intensity and frequency depending on the image displayed) and black screen after a while.
A new video
That noise does not seem to come from the EHT or quad but I can't tell if it's more the SMPS or the G2 board.
What do you think?
Help. Please. I'm lost...
Carsten
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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capa
Joined: 22 Oct 2007
Posts: 33
Location: Hamburg, Germany
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| Posted: Wed Sep 17, 2008 8:19 pm Post subject: |
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I'm completely baffled...
This is Curt's layout photo, I'm looking at the AC input board...
This is what I found behind the G2 board...
What is this???
(Could this be the source of the strange noise??)
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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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 Sep 17, 2008 8:36 pm Post subject: |
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Hang on a sec. Projectors rarely have more than one problem at a time.
When you say the picture goes black, does the EHT red LED come on? (Oh, 2 LEDs in the Cine).
That would mean you still have HV issues.
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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: Thu Sep 18, 2008 4:23 am Post subject: |
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Cine 8's have a few changes from the regular 808 chassis.
But I'm still surprised at your Main input board:
It's where the AC mains are connected to directly. It works in conjunction with the SMPS. The large caps are right after the AC to DC diode bridge to filter things out a bit before proper DC rectification takes place.
What surprises me however is that your card seems COMPLETELY different than mine and has extra stuff on it and even a fan!
Here's mine:
This is from a Zenith 1200 (Barco Cine 8 Onyx clone). The part number is (R762507).
I wonder what the small circuit board on yours is for.
Weird.
Kal
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Thu Sep 18, 2008 7:30 am Post subject: |
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Never seen that kind power input board, cine8 installation manual have similar board what in picture Kal posted.
Maybe it's used in later models. Don't see voltage jumper in it, maybe it have automatic 120V/220V switching or something...
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r.bauer
Joined: 08 Apr 2006
Posts: 280
Location: The Netherlands
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| Posted: Thu Sep 18, 2008 9:00 am Post subject: |
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That board is the active PFC, or Power Factor Corrector to keep the Cos Φ as close as possible to 1. That makes your projector an easier load for your power grid.
At some time you could order your Barco with or whithout a PFC, but now they all come with it. It is a very common board in Cine models. Hope it never fails though, I do not want to know how much Barco would charge for this module.
This shouldn't be the cause of your porblem. Check Curt's comment.
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r.bauer
Joined: 08 Apr 2006
Posts: 280
Location: The Netherlands
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| Posted: Thu Sep 18, 2008 9:09 am Post subject: |
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Looking at your picture for the second time, I see that you have Sony tubes in your Cine8. I did not know of any Cine 8 that used sony tubes. Interesting.
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capa
Joined: 22 Oct 2007
Posts: 33
Location: Hamburg, Germany
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| Posted: Thu Sep 18, 2008 8:00 pm Post subject: |
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| r.bauer wrote: | | Looking at your picture for the second time, I see that you have Sony tubes in your Cine8. I did not know of any Cine 8 that used sony tubes. Interesting. |
How did you see that?
Just curious...
Update:
The noise is coming from the quad. Found out with a stethoscope today.
Have put thermal grease between the metal bar of the quad and the frame of the projector
and the set survived a complete movie. But the frame gets extremely hot around the quad...
Suggestions?
Replace the quad (R762717)?
Regards
Carsten
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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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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r.bauer
Joined: 08 Apr 2006
Posts: 280
Location: The Netherlands
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| Posted: Thu Sep 18, 2008 11:14 pm Post subject: |
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| capa wrote: | | r.bauer wrote: | | Looking at your picture for the second time, I see that you have Sony tubes in your Cine8. I did not know of any Cine 8 that used sony tubes. Interesting. |
How did you see that?
Just curious...
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Sony tubes have an extra H/V wire that is connected to an extra grid in the gun. These thinner than usual H/V wires are color coded in newer projectors and run from the neckboard to the to the small splitter block that is connected to the G2+Diagnostics board. The small splitter is fed +5kV from the H/V quadrupler. To this day I still don't know why the sonys use this extra grid, as they run just fine whithout it. All ES-focussing PJ's like the 800/801s also have them. Its a sony thing.
Back to you problem, it looks like your quad is dying.
have you tried another quad?
Quad's are always safe to touch, temperature wise. If they run too hot for you to touch, then they are dissipating too much energy and should be replaced before they take other things down, like the EHT. problems with HV or Quads are always getting worse and don't go away by themself.
If you had an arc problem, small chance that a rubber seal (such as to fix a leaking bike-tyre) will temporally fix the problem.
The alu plate on the quad is connected to nothing, it is there for structural/mechanical reasons only.
Just continue troubleshooting this problem with Curt.
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capa
Joined: 22 Oct 2007
Posts: 33
Location: Hamburg, Germany
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| Posted: Fri Sep 19, 2008 5:46 am Post subject: |
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Hi all.
First of all thank you for all the support here 
That projector was built-to-order by Barco on an empty chassis for the former owner back
in 2001 and I guess he just wanted to have Sony tubes for whatever reason.
This thing cost him 28k EUR (~40k $)
I already had the quad and the EHT shipped over to curt ($70 shipment for those two small
components is a rip-off isn't it?) and got another EHT back.
The quad is almost silent in dark scenes and starts to make that noise when things get brighter.
I guess it's not brightness on it's own, more the rapid change of bright to dark in one image.
There is one test pattern on the DVE test disc (squares and circles) where the quad almost
starts screaming...
Have no replacement quad at hand and as far as I've heard they are hard to get and I think
at least as expensive as the EHT was... 
Regards
Carsten
p.s. Have added a PDF file with more information on the power factor corrector board.
(Removed because I might violate some copyrights here...)
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capa
Joined: 22 Oct 2007
Posts: 33
Location: Hamburg, Germany
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| Posted: Mon Sep 22, 2008 3:37 pm Post subject: |
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Hi there...
Anyone? Any suggestions?
Swap the quad? If so, Curt do you still have one for me?
Best regards
Carsten
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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 Sep 22, 2008 3:42 pm Post subject: |
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Yes, I now have a lot of quads here. Email me at curtpalme@shaw.ca.
Cheers!
Curt
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