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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Jan 15, 2012 9:47 pm Post subject: |
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| Nashou66 wrote: |
So I see you have a de-potted HVPS on your bench huh Mac!!! Seeing if you can rebuild the blown HV sections are you?!?!
Athanasios |
Yeah, I had one sent to me a while back that supposedly had a problem in the potted section, which is did. Figured I open it up now so I could map out all the PS so I know where everything goes in these things.
Any one else open the potted section on one of these with a failure? I'd be curious if it was the same problem. Wouldn't mind carving up a couple more to see if the failure is consistent.
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Tue Jan 17, 2012 10:56 am Post subject: |
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Hi,
Just a quick question:
I've see that on the Backplane Mother Board there are two HVPS-related jumpers. One should read "34KV-INH" and the other "40KV-INH". Without knowing exactly what those do, wouldn't it still make sense verifiying how these are set in the problematic PJ and to compare that to a known good machine?
Regards,
barclay66
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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 29, 2012 6:28 pm Post subject: |
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Well Guy's,
Not much to report, looking at testing with a Revision A HVPS.
Also have a replacement green tube to install, this was going to be changed anyway, so why not swap it out, might be the problem tube??
Made a great mess doing this,
Cheers
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sun Jan 29, 2012 6:33 pm Post subject: |
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| HK-Steve wrote: | Well Guy's,
Not much to report, looking at testing with a Revision A HVPS.
Also have a replacement green tube to install, this was going to be changed anyway, so why not swap it out, might be the problem tube??
Made a great mess doing this,
Cheers |
That is Sweet!! How long did it take you to dig it all out?
Athanasios
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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 29, 2012 6:47 pm Post subject: |
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About 4 days on and off,
estimate 2 straight hrs if done in 1 sitting. But hands do get sore after a little while.
Will do another one, as I damaged the transformer inside the potting.
Everything else is good, now to map it out.
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 29, 2012 6:48 pm Post subject: |
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Oh Yeah, found no damaged or failed parts inside the potted section.
Just the damage I did getting it all out.
Cheers
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Jan 29, 2012 6:54 pm Post subject: |
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| HK-Steve wrote: | About 4 days on and off,
estimate 2 straight hrs if done in 1 sitting. But hands do get sore after a little while.
Will do another one, as I damaged the transformer inside the potting.
Everything else is good, now to map it out.
Cheers |
I already have the map Steve, so dont waste your time.
Have you identified all the bad components yet?
And I need a resistor value on that large resistor in front of the transformer in the potted section.
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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 29, 2012 7:02 pm Post subject: |
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Which resistor? the really long ones??
Pic
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Jan 29, 2012 7:13 pm Post subject: |
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No, It's a round one running from the lower board to the upper board in the potted section. It is right in front of the main transformer also in the potted section.
If it's marked on either board it is R95.
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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 29, 2012 7:24 pm Post subject: |
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Hmmmm, not sure which one you are refering to,
as this is what I found,
8x diodes,
3x 470 ohm resistors,
2x 2.7k ohm
1x 144pF capacitor,
2x 250K ohm resistors,
1x 0.022uF 6000v capacitor,
11 x 0.022uF 10,000v capacitors,
also the transformer,
that is it.
Cheers
Last edited by HK-Steve on Sun Jan 29, 2012 7:42 pm; edited 1 time in total
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Jan 29, 2012 7:28 pm Post subject: |
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I'll snap some pics of the location later.
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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 29, 2012 7:33 pm Post subject: |
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That would be cool,
I sent you a PM, I will send my email address if that make it easy??
Pic of the parts.
Cheers
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Sun Jan 29, 2012 7:36 pm Post subject: |
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There's your problem! Your truck in the potting material, it's trailing flames. 
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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: Sun Jan 29, 2012 7:36 pm Post subject: |
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Have you ever thought that the flames on the trucks on your workbench surface are encouraging the HVPS to blow up? 
Nice disassembling of the potted section!!!!
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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 29, 2012 7:41 pm Post subject: |
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Damm, didn't think about the truck, should have left my Ducati one on the workbench instead, ha ha.
Thanks Curt,
Have got lots of pics, can post if interested, took pics at each step of the disection.
Cheers
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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: Sun Jan 29, 2012 7:43 pm Post subject: |
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The biggest thing is to try and find something that dissolves or softens the potting compound. Spellman won't tell us anything, but I have upwards of 50 BArco quadruplers here that are defective that I've been saving to try and get something that will get that compound out of there...
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Jan 29, 2012 7:49 pm Post subject: |
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| HK-Steve wrote: | That would be cool,
I sent you a PM, I will send my email address if that make it easy??
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PM answered. Let me know.
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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 29, 2012 7:50 pm Post subject: |
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I used a knife to cut it apart, but the material is brittle, so it sort of pops off in chunks.
I have a solution here which I am about to try on the 2nd HVPS, so I will report back on how it goes.
The first HVPS was a Revision B.
This next one is a Revision A.
Let the mess begin
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 29, 2012 8:08 pm Post subject: |
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Well, the solution to breakdown the potted section, did not work,
just sat on the top, didn't soften at all. NEXT??
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 29, 2012 8:54 pm Post subject: |
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The material in the potted section just swelled a little, not softened.
Then I found the burnt resistor, gone completely, and the burnt circuit board.
more to come.
Cheers
.
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