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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Fri Jan 13, 2012 2:48 pm Post subject: |
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| barclay66 wrote: | Hi,
The backplane connector is part of the wiring harness which is located below the belly fans. Although the connector itself seems to be ok it could be possible that one of the wires hasn't been crimped to it correctly. This could be checked. Another idea could be changing the complete harness (maybe some can take one out from a scrapped set)...
Regards,
barclay66 |
I had to read back to the beginning but Steve already changed the wiring loom, unless his was bad as well. It could be the LVPS's connector, but that would blow out the LVPS 390 line, I know I have done it. Destroyed PCB board .
Athanasios
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Fri Jan 13, 2012 3:29 pm Post subject: |
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Hi,
| Nashou66 wrote: | | Ok so a nice clean contact blade rules out the connector itself. |
Mostly yes. Except if it is bent away completely. But then it would be a permanent fault.
| Nashou66 wrote: | Now onto the Back plane...that should be fun!  |
As far as I've seen there is no back plane if You're associating some kind of board with this term. Its just a bunch of cables which lead to the LVPS's connector and the Upper and the Backplane Motherboard. But yes, why not go one step after another, verify and possibly rule out everything that can be checked so that finally the real source of the problem is found. As somebody said: "When you have excluded the impossible, whatever remains, however improbable, must be the truth."
For some years I had been repairing arcade machines. The game PCBs use almost identical edge connectors and wiring harnesses. Although voltages are much lower, the total load on the contacts can be pretty high. Especially on the +5V supply lines (sometimes up to 10A). I've seen all kinds of bent & burnt contacts and associated problems. Having seen those connectors on the LVPS and HVPS I just wanted to make sure that there are no issues involved with them.
| Nashou66 wrote: | | What would next after the Back plane? Mother board? But i can't see anything there causing a massive Failure. |
Me neither. In this case I would approach the HVPS again from its other "end", the outputs. The tubes and the splitter could be tested in another set. The G2 cables could be checked. The neckboards could be tested in another set. I don't think that we're already run out of options yet and I'm very curious about the reason for these HVPS failures...
Regards,
barclay66
Edit: I too didn't have in mind that the harness had already been changed. That adds an erratic twist to the whole situation!
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jan 13, 2012 5:00 pm Post subject: |
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| HK-Steve wrote: | The contacts on all 3 HVPS's are perfect,
shiny, no burns, no tarnish, nothing, see pic, just a nice pressure contact mark.
all look exactly the same.
Keep the ideas comming, we are going to get this worked out.
Cheers
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Which of these connectors are the G2's to the neck boards? Not the drives from the CLM.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jan 13, 2012 5:18 pm Post subject: |
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Never mind. I found it. I'm going to do a little checking.
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Fri Jan 13, 2012 5:19 pm Post subject: |
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Hi,
Arcing into the deflection coils would most likely damage either HDM, VDM, CAB or SAB, depending on the location of the arc. At present I can't imagine of any scenario where any deflection voltage could have any impact onto the HVPS. This is due to fact that the impedance of the HV line is so high that no significant current can flow at those low voltages (compared to 34.9KV).
What I don't know: Is the HV output short-circuit proof? Anyone willing to test?
If not, arcing (which is kind of a short through ionized plasma), a bad splitter or bad tube could easily damage the HVPS...
Regards,
barclay66
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jan 13, 2012 6:30 pm Post subject: |
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If an arc came back through a G2 line it would of most likely damaged some other components on the way. I would test resistance between each G2 line with another G2 line and also to ground. All readings should be in mega ohms.
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Fri Jan 13, 2012 7:24 pm Post subject: |
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Good idea!
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Fri Jan 13, 2012 8:18 pm Post subject: |
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Follow the yellow brick road to/from the original exploded fuse. There must be a clue there someplace.
Never have these kind of problems with a A**** 
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jan 13, 2012 9:02 pm Post subject: |
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| stefuel wrote: | Follow the yellow brick road to/from the original exploded fuse. There must be a clue there someplace.
Never have these kind of problems with a A**** |
Problem is, the wolf is outside the house. The little piggy fuse is in the house and surrounded by lots of furniture and hay and walls. Were trying to figure out how that damn wolf keeps on getting in the house and eating the little piggy and were he's getting in.
Plus it's a Spellman and an almost twin sister to that spellman your thinking of....... Of course that explains why the culprit is outside the supply, LOL......
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Fri Jan 13, 2012 9:08 pm Post subject: |
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| Nashou66 wrote: | | stefuel wrote: | Follow the yellow brick road to/from the original exploded fuse. There must be a clue there someplace.
Never have these kind of problems with my Ass hole |
Is that what you wanted to say?
Nashou |
What is it with Greeks and ass's anyways
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A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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HK-Steve
Joined: 15 Jul 2006
Posts: 849
Location: Switzerland
TV/Projector: Marquee 9500, Epson 8100
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| Posted: Sun Jan 15, 2012 9:28 am Post subject: |
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Now to get you guy's back on topic, he he.
Well and 3 HVPS's measure pretty much the same,
G2 to G2 measures 2.2M Ohm, all the same
G2 to ground 4M Ohm, all the same.
Across the 390Volt input, I get 0.5 Ohm, so pretty much a dead short.
Can someone measure the resistance across the 390Volt input, to give me a baseline measurement.
Cheers
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HK-Steve
Joined: 15 Jul 2006
Posts: 849
Location: Switzerland
TV/Projector: Marquee 9500, Epson 8100
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| Posted: Sun Jan 15, 2012 9:32 am Post subject: |
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I get 100K Ohm across a Revision A 34.9Kv
110K Ohm across a Revision C 34Kv
Much Appreciated.
Cheers
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sun Jan 15, 2012 3:08 pm Post subject: |
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Can you measure the resistance of the good power supplies 390 while in the PJ but not turned On steve?
Also measure the G2 while plugged in at the VNB to VNB, I think that is what Mac meant not G2's between contacts of the HVPS if that is how you measured it.
I think the direction he is going is to find a short in the chassis that is causing the HVPS to blow.
| Mac wrote: | | If an arc came back through a G2 line it would of most likely damaged some other components on the way. I would test resistance between each G2 line with another G2 line and also to ground. All readings should be in mega ohms. |
\
So measure G2 from VNB's G2 line to Ground with a good HVPS in but not turned on. And also G2 of each vnb to anthers G2 line to see if some how there is a short there.
Right Mac? Or am I not even close?
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
Marquee C-element and Bellow removal
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Jan 15, 2012 5:21 pm Post subject: |
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No, Steve had it right. I just wanted the measurement of the supply to see if anything was out of spec if a arc came back through the G2 line.
Steve, check CR7 for any reverse leakage. Those other G2 numbers are fine.
Those 0.5 ohm readings on the bad supplies are surely caused by damaged parts which would be expected with a blown fuse. You should probably identify what parts are bad looking at CR3, CR4, CR5, CR6, Q1, Q2, VR1 and VR2. Removing any of these shorted parts should return your 390 resistance to normal. Normal on a supply I have here appears to be around 87k and reversing leads goes to 325k. See if you also have this on a good supply.
Of course I have the HV transformer removed from this one so that could be making a difference.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Jan 15, 2012 6:36 pm Post subject: |
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Of course it wouldn't hurt to get a reading of those G2 lines going to and attached to the neck boards. There is a small filter circuit tied to gnd.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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