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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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bbfarmht
Joined: 27 May 2006
Posts: 1273
Location: Where the Mississippi runs east to west!!
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| Posted: Sat Jan 23, 2010 10:12 pm Post subject: |
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| cmjohnson wrote: | One issue with the Marquee LC assembly is that the glycol is slightly corrosive to aluminum, and the chamber is aluminum, but it's
anodized. However it's not perfectly protected against glycol attack.
I can take a clean piece of aluminum, close it up in a jar of glycol, and observe it slowly start to corrode over a period of time.
I BELIEVE that an optimal solution would be to obtain some black industrial epoxy paint and paint all inner aluminum surfaces that will
be touching glycol. For obvious reasons this would best done when the CRT is completely out of the housing and the bellows is not
attached, either.
Several gun finishes may also be appropriate: KG Guncote, Cerrocote, or Duracoat.
If anyone has stripped LC chambers lying around, they would be ideal for making this experiment a reality.
Since I'll have to go in there anyway, soon, I'll be removing the old bellows, cleaning everything, mask off the CRT, apply epoxy
paint, install new bellows, and see how that holds up for the long term with fresh glycol.
CJ |
It would be better, if you are going to through the trouble, to powder coat the housing. You would get an even coat all around the housing since the process uses electrostatic it will find the nooks and crannies better. Also most powder coating materials are resistant to gas and other substances so I would think that it should be resistant to the glycol.
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Adam
"Any society that would give up a little liberty to gain a little security will deserve neither and lose both"
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Sun Jan 24, 2010 12:56 am Post subject: |
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The ceramic cerrocote finish is usually available anywhere powdercoating is available, and it's more durable and less chemically reactive
than powdercoat.
But, in any event, the LC housing will have to be tubeless when you do anything that will require oven curing. Epoxies can be applied
without having to remove the tube from the housing.
CJ
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Sun Jan 24, 2010 1:13 am Post subject: |
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Do what NEC did.
They never have problem with cloudy glycol.
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-Pjackso
Joined: 31 Mar 2006
Posts: 791
Location: Oklahoma
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| Posted: Sun Jan 24, 2010 3:23 pm Post subject: |
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Could it be the sealant/potting compound?
...Maybe as the sealant ages, it chemically contaminates the glycol.
Also, if the OEM was ok using the sealant in direct contact with the glycol - why not just apply the sealant to the anodized surfaces also? You'd already have it (during a retube), and it's extremely easy to apply.
You could also use it to seal over any areas that has damage to the anodize (scratches, rust, thin areas, etc).
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sun Jan 24, 2010 5:33 pm Post subject: |
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| -Pjackso wrote: | Could it be the sealant/potting compound?
...Maybe as the sealant ages, it chemically contaminates the glycol.
Also, if the OEM was ok using the sealant in direct contact with the glycol - why not just apply the sealant to the anodized surfaces also? You'd already have it (during a retube), and it's extremely easy to apply.
You could also use it to seal over any areas that has damage to the anodize (scratches, rust, thin areas, etc). |
Thats exactly what Jarmo did in finland, he used the black RTV and said it is working well.
Athanasios
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xgwow
Joined: 19 Jan 2010
Posts: 1
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| Posted: Fri Jan 29, 2010 7:04 pm Post subject: |
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| cmjohnson wrote: |
The problem started becoming visible just recently with a greenish cast to the perimeter of the screen when showing a pure blue field.
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I have the same on-screen "tunnel" symptom with my 9500LC. Not too pronounced but noticeable. CJ noticed the yellowed glycol on the ebay listing before I won it. I was hoping that was the cause of the "tunnel". On a white test pattern it's a white center and yellow perimeter. The middle looks great to me so I'm encouraged! Just ordered the fancy new bellows so mine is next in line to be saved 
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Fri Jan 29, 2010 7:08 pm Post subject: |
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| xgwow wrote: | | cmjohnson wrote: |
The problem started becoming visible just recently with a greenish cast to the perimeter of the screen when showing a pure blue field.
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I have the same on-screen "tunnel" symptom with my 9500LC. Not too pronounced but noticeable. CJ noticed the yellowed glycol on the ebay listing before I won it. I was hoping that was the cause of the "tunnel". On a white test pattern it's a white center and yellow perimeter. The middle looks great to me so I'm encouraged! Just ordered the fancy new bellows so mine is next in line to be saved |
On the way to the post office now 
thanks for your order, wash the bellows before adding the glycol to remove any release agent that might be left on them from the manufacturing process.
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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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Fri Jan 29, 2010 8:44 pm Post subject: |
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| xgwow wrote: | | cmjohnson wrote: |
The problem started becoming visible just recently with a greenish cast to the perimeter of the screen when showing a pure blue field.
|
I have the same on-screen "tunnel" symptom with my 9500LC. Not too pronounced but noticeable. CJ noticed the yellowed glycol on the ebay listing before I won it. I was hoping that was the cause of the "tunnel". On a white test pattern it's a white center and yellow perimeter. The middle looks great to me so I'm encouraged! Just ordered the fancy new bellows so mine is next in line to be saved |
If your Marquee has the CMM, it can also cause nonuniformity problems on screen. The CMM is an even easier fix, just pull it out and don't use one  The CMM causes other troubles with the image as well, so good riddance.
criagr
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Fri Jan 29, 2010 8:47 pm Post subject: |
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| CIR Engineering wrote: | | xgwow wrote: | | cmjohnson wrote: |
The problem started becoming visible just recently with a greenish cast to the perimeter of the screen when showing a pure blue field.
|
I have the same on-screen "tunnel" symptom with my 9500LC. Not too pronounced but noticeable. CJ noticed the yellowed glycol on the ebay listing before I won it. I was hoping that was the cause of the "tunnel". On a white test pattern it's a white center and yellow perimeter. The middle looks great to me so I'm encouraged! Just ordered the fancy new bellows so mine is next in line to be saved |
If your Marquee has the CMM, it can also cause nonuniformity problems on screen. The CMM is an even easier fix, just pull it out and don't use one The CMM causes other troubles with the image as well, so good riddance.
criagr |
You aint kidding! the newer board is even worse that the older one!! I have been spending lots of time looking at this problem of the vertical bars. I got one fix but it causes another smaller issue so for now I have to stick with it, for my blend i really think I need the CMM to boost output on the edges.
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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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Fri Jan 29, 2010 8:55 pm Post subject: |
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| Nashou66 wrote: |
You aint kidding! the newer board is even worse that the older one!! I have been spending lots of time looking at this problem of the vertical bars. I got one fix but it causes another smaller issue so for now I have to stick with it, for my blend i really think I need the CMM to boost output on the edges.
Athanasios |
Blending is another deal. The CMM can be real useful in a blend, but the negatives remain You just have to deal with it.
craigr
_________________
JETI 1501-HiRes 2nm Spectroradiometer
JETI 1211 Spectroradiometer
Photo Research PR-650 Spectroradiometer
Klein K10-A Colorimeter
Murideo Fresco SIX-G HDMI 2.x Multimedia Generator
Murideo Fresco SIX-A HDMI 2.x Analyzer
Light Illusion ColourSpace XPT Color Calibration Software
Light Illusion LightSpace XPT Pro Version 10.x Color Calibration Software
OMARDRIS JVC Software Patch to use K10-A and Jeti with JVC OEM AutoCal Software!
Sencore CR7000 CRT Tube Analyzer / Rejuvenater
Authorized Dealer for Lumagen & just about everything worth buying
www.CIR-Engineering.com - craigr@cir-engineering.com
Phone: 865-405-6892
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psilvest
Joined: 27 Jan 2007
Posts: 44
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| Posted: Sun Jan 31, 2010 9:12 pm Post subject: |
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| Nashou66 wrote: | | -Pjackso wrote: |
Also, if the OEM was ok using the sealant in direct contact with the glycol - why not just apply the sealant to the anodized surfaces also? You'd already have it (during a retube), and it's extremely easy to apply.
You could also use it to seal over any areas that has damage to the anodize (scratches, rust, thin areas, etc). |
Thats exactly what Jarmo did in finland, he used the black RTV and said it is working well.
Athanasios |
I am changing a C-element, it could be the right time to protect the chamber against contamination. Is there any additional information on what Jarmo did, when, and results?
By the way, Nashou, I have a spare CMM if you are interested.
Pier
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