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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Oct 09, 2009 7:28 pm Post subject: |
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Other wise your going to have to test some voltages on the output boards.
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Fri Oct 09, 2009 7:42 pm Post subject: |
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| macgyver655 wrote: | So I take it you had a controller module to try.
A possibility is there may be a short on one of the output boards on the neckboard assy., and it may be drawing down a voltage. Try disconnecting the harnesses from the outputs, 1 board at a time and test. |
I do not have a controller nor have I tried that one yet.
Disconnecting the output boards sounds like a great idea, I'm going to give that a go right now.
Looks like the H shift is on the focus card. And the only focus card I have is from an 808. Both the mother and daughter look just like the one in my 1208 which is part number R762271. But the 808 part number is R762503. Wonder what the differnce is or whether I would blow something else out if I tried it. Curt said maybe the H shift could be involved and it is tempting me.
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Fri Oct 09, 2009 7:57 pm Post subject: |
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| macgyver655 wrote: | So I take it you had a controller module to try.
A possibility is there may be a short on one of the output boards on the neckboard assy., and it may be drawing down a voltage. Try disconnecting the harnesses from the outputs, 1 board at a time and test. |
That was it!
Its the blue neck board.
The harness has to be disconnected from the chassis or the red and green don't work. At least I know what part is bad and that helps a lot, thank you macgyver.
My wife has been really giving me a hard time over this thing being broken, she's always wanting to watch movies with me. It will be real nice to finally be able to tell her progress was made today.
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Fri Oct 09, 2009 8:02 pm Post subject: |
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whats the number of the neckboard?
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Fri Oct 09, 2009 8:52 pm Post subject: |
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| jkruger wrote: | | whats the number of the neckboard? |
It says R762292 and looks like a black box. But it was modified years ago at the pin socket for a Sony 9" tube.
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Fri Oct 09, 2009 8:57 pm Post subject: |
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I have three of the black box type but the numbers are 7621195.
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Fri Oct 09, 2009 9:12 pm Post subject: |
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You have a pm from me.
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Fri Oct 09, 2009 9:40 pm Post subject: |
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Does anyone here know the difference between a R7621195 and R762292 neck board?
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Sat Oct 10, 2009 1:01 am Post subject: |
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There must be some kind of difference, the barco spreadsheet says they use different part numbers. I think Ile would be the authority on this.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Oct 10, 2009 2:35 am Post subject: |
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The R7621195 only came on the BG1200.
The R762292 came on the 1200, 1208 and 1209.
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TbX
Joined: 06 May 2006
Posts: 94
Location: Sweden
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| Posted: Sat Oct 10, 2009 2:37 am Post subject: |
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R7621195 is for sony tubes it should have a red cable for g2 card
R762292 is for mec tubes
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Oct 10, 2009 2:51 am Post subject: |
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| TbX wrote: | R7621195 is for sony tubes it should have a red cable for g2 card
R762292 is for mec tubes |
This would make sense since the 1200 came with Sony or Mec tubes and the 1208 and 1209 only MEC's. This would mean that since you have Sony tubes and the original R762292 was modded for the Sonys, then you should be able to use the R7621195's straight up........
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Sat Oct 10, 2009 4:19 am Post subject: |
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These neckboards have the red wire but they have been clipped off at about 6" (150mm) from the box. They are from an older 9" PJ.
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Sat Oct 10, 2009 10:03 am Post subject: |
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I have R7621195's with focus wires from my chopped BG1200 laying somewhere, but can't remember if I modded those all with VPA-18 chips or just one.
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Sun Oct 11, 2009 6:01 am Post subject: |
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I am expecting another neck board from a BG1200 in the near future and when it arrives I will let everyone know exactly how it differs from the BG1208 neck board.
Here is another current update. I was able to further isolate the neck board problem to be pin 6 of J1 and that is marked IBCL. Does anyone know what IBCL stands for? I found out the projector will run fine if I bend pin 6 over so it doesn't hit the socket. I also found and replaced 3 visually burned out resistors but that did not seem to fix the neck card.
So at this time, I have a projector that runs and can play movies now, but IBCL is not connected to the blue neck card from the motherboard. And the blue crt is working surprisingly well without IBCL (whatever it is for).
But I am also troubled by the fact that the blue tube continues to flashes on startup. I fear this whole episode may turn out to be caused by a bad blue tube.
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Sun Oct 11, 2009 11:29 am Post subject: |
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| RVonse wrote: | I was able to further isolate the neck board problem to be pin 6 of J1 and that is marked IBCL. Does anyone know what IBCL stands for? I found out the projector will run fine if I bend pin 6 over so it doesn't hit the socket. I also found and replaced 3 visually burned out resistors but that did not seem to fix the neck card.
So at this time, I have a projector that runs and can play movies now, but IBCL is not connected to the blue neck card from the motherboard. And the blue crt is working surprisingly well without IBCL (whatever it is for).
But I am also troubled by the fact that the blue tube continues to flashes on startup. I fear this whole episode may turn out to be caused by a bad blue tube. |
IBCL stand for individual beam current limiter, pin 6 goes from cathode to driver board. Driver board lower contrast when tubes cathode draw too much current, I think it's made to protect neck boards when tube have problems.
I think your blue tube might have short in cathode and it's drawing too much current and IBCL is working as it should. Now when you have bypassed it contrast is back. But eventually you are burning neck board.
Tab tubes neck and run crt run in cycles few hour, other and more effective option is to try blast crap out of cathode with sencore.
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Sun Oct 11, 2009 4:57 pm Post subject: |
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| Ile wrote: | | RVonse wrote: | I was able to further isolate the neck board problem to be pin 6 of J1 and that is marked IBCL. Does anyone know what IBCL stands for? I found out the projector will run fine if I bend pin 6 over so it doesn't hit the socket. I also found and replaced 3 visually burned out resistors but that did not seem to fix the neck card.
So at this time, I have a projector that runs and can play movies now, but IBCL is not connected to the blue neck card from the motherboard. And the blue crt is working surprisingly well without IBCL (whatever it is for).
But I am also troubled by the fact that the blue tube continues to flashes on startup. I fear this whole episode may turn out to be caused by a bad blue tube. |
IBCL stand for individual beam current limiter, pin 6 goes from cathode to driver board. Driver board lower contrast when tubes cathode draw too much current, I think it's made to protect neck boards when tube have problems.
I think your blue tube might have short in cathode and it's drawing too much current and IBCL is working as it should. Now when you have bypassed it contrast is back. But eventually you are burning neck board.
Tab tubes neck and run crt run in cycles few hour, other and more effective option is to try blast crap out of cathode with sencore. |
I was hoping not to hear this kind of bad news.
These tubes came from an Ampro 4200, first the red suffered from low emission and now this blue tube seems to be giving me trouble in the gun. And neither tube has had time to even develope any burn or wear.
For the moment at least, the projector is playing well with pin 6 unhooked. Watched a movie last night in fact. I guess thats not going to last too much longer though. Time to get another blue tube.
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RVonse
Joined: 09 Mar 2006
Posts: 3152
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| Posted: Tue Oct 20, 2009 5:45 am Post subject: |
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An update for anyone who might be interested in the differnce between the neck boards 1200 vs 1208. I compared the 1200 neck board I got today with my blown 1208 and as expected they look similar and the main difference is the pinout of the socket. But there are other minor differences as well. The 1200 neck board aluminum enclosure is actually about 1/4" physically larger than the 1208. Just enough bigger, I had to cut aluminum to get it to fit inside my chassis. The extra G3 red wire coming from 1200 neck for some reason has no effect whether or not it is even hooked up. I'm thinking that may be why someone cut it off.
After some minor physical modifications I successfully installed the 1200 neck board and all is working fine now with IBCL hooked up. So I know for sure my old neck board has something bad related to IBCL.
The other bad news is that my blue tube continues to flash during start up even with the replaced neck board. This particular issue is really some crazy crap I have run into. Just hope I don't blow out another neck board before I have the opportunity to swap that crt out.
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Tue Oct 20, 2009 3:24 pm Post subject: |
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Have you tried tapping on the the tube neck to try to dislodge whatever crap could be on the cathode? That sounds like the answer to me.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Oct 20, 2009 4:29 pm Post subject: |
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I'm curious if you've tried both G2 boards for the blue flicker on start up problem?
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