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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: Thu May 13, 2010 2:50 am Post subject: |
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Sure, shoot me an email to curtpalme@shaw.ca.
Cheers!
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jarseneau
Joined: 06 Nov 2007
Posts: 323
Location: WI
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| Posted: Thu May 13, 2010 12:13 pm Post subject: |
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Aargh! I feel your pain Ironman. But don't be discourged as the NECs are quite reliable. I wonder how this happened since I've done 100's of tube run-in hours without a hint of this. To me it doesn't sound normal if you didn't scan off the edges of the face, especially if you kept the contrast down in the 30-50 range. Usually the outer glass breaks before the actual CRT in any overheating. If the sweep failed, I would think there would be burns on the red & blue but perhaps not if you had them in cut- off.
If the boards check fine with Curt, you could check with VDC if this wasn't some kind of premature failure of the tube. Did the tube come from VDC with the NEC mounting, or did you install that? Was an air bubble left in the glycol to allow expansion? Even if there wasn't I'd expect the faceplate glass to break ahead of the thicker CRT glass.
_________________
Jerry
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Ironman1965
Joined: 28 Jun 2007
Posts: 98
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| Posted: Fri May 14, 2010 2:01 am Post subject: |
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| jarseneau wrote: | Aargh! I feel your pain Ironman. But don't be discourged as the NECs are quite reliable. I wonder how this happened since I've done 100's of tube run-in hours without a hint of this. To me it doesn't sound normal if you didn't scan off the edges of the face, especially if you kept the contrast down in the 30-50 range. Usually the outer glass breaks before the actual CRT in any overheating. If the sweep failed, I would think there would be burns on the red & blue but perhaps not if you had them in cut- off.
If the boards check fine with Curt, you could check with VDC if this wasn't some kind of premature failure of the tube. Did the tube come from VDC with the NEC mounting, or did you install that? Was an air bubble left in the glycol to allow expansion? Even if there wasn't I'd expect the faceplate glass to break ahead of the thicker CRT glass. |
I don't think it was scanning off the face but I could be wrong. Have a look at my post and you'll see the description of what the face of the tube looked like when I looked in after setting th PJ for conditioning. I didn't make ti to 50% contrast and brightness. The tube cracked at 45%. It failed between the 60-72 hour mark. Red and blue were disconnected while I was conditioning. I swapped the mounting lug myself, and due to an unfortunate mishap broke the outer glass. Couldn't find a replacement glass so I was told that clear lexan works well so that is what I ended up using. I would expect if there was pressure that the lexan itself would flex some to compensate. I also bled all 3 of my tubes before putting everything back together leaving about a 3/8" diameter bubble if tube held face up and allowing the bubble to move to the middle of the glass. I figure that VDC won't honor the warranty because I swapped the mounting lug, but I plan on giving it a try if my boards come back good. I think it would be kind of lame if they don't honor their warranty as re-assembly of the tube lug and face glass was really not all that hard at all. the hardest part was getting everything spotless for long enough to silicone back together without contamination, which I must say I did an excellent job of (i tiny piece of lint at the bottom of the chamber that was only well visible with a magnifying glass.
BTW Curt I'm still waiting for your address.
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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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Ironman1965
Joined: 28 Jun 2007
Posts: 98
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| Posted: Sat May 15, 2010 1:20 am Post subject: |
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What could possibly go wrong in the mounting process. You silicone the lug to the tube. Let dry. Pretty simple, or am I missing something? I applied the silicone to the lug and gently set the tube into the lug then pressed down on the tube by hand. Then squeegeed the silicone around the inside. Once cured I used my finger to rub off the excess. BTW the boards went out today.
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Ironman1965
Joined: 28 Jun 2007
Posts: 98
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| Posted: Tue May 18, 2010 2:56 am Post subject: |
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Curt, the boards are at the Langley Greyhound depot.
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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: Tue May 18, 2010 3:00 am Post subject: |
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THey are, didn't get a chance to grab them today, but will tomorrow.
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Ironman1965
Joined: 28 Jun 2007
Posts: 98
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| Posted: Sat Jun 05, 2010 5:40 pm Post subject: |
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Well, I contacted VDC yesterday, got an RA number and put the tube in the mail. They said that they'd check the tube out and if it failed due to a defective tube they will replace N/C. If it failed due to my bad or H/W failure they will replace for a 50% surcharge or something like that. Either way I'll get my tube replaced without paying the full amount again. If they deem it as my or my H/W's fault, I will be OK with having to pay another $400. I won't be thrilled with it, but it's better than nothing.
Terry. I got the green tube I purchased from you all assembled yesterday, and the silicone is curing as we speak. My next trial run will be next weekend.
Curt. I picked up the boards and got them installed yesterday. Do you think I should apply new compound to my astig heat sink before putting my PJ back in service?
Also ordered a custom plenum for the PJ so I can put the extraction fan into service. Does anybody have any thoughts on using an extraction fan without having the PJ hush boxed? I was wondering if it would be a good idea to cover up some of the venting on the covers to direct/force the air flow to where the fans would draw the air in. Also would it be a good idea to enlarge or add more openings to the bottom of the PJ to allow more unrestricted air flow or direct air flow to other hot spots inside the PJ?
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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: Sat Jun 05, 2010 6:31 pm Post subject: |
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WHat I do is check the heat sink compound sticking out the edges of the chips. If it's sticky and comes off on your finger or screwdriver, it should be OK. If it's hard and you can't move it around with a screwdriver end, then I would pull the remaining boards and redo the compound.
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Ironman1965
Joined: 28 Jun 2007
Posts: 98
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| Posted: Sat Jun 05, 2010 6:42 pm Post subject: |
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| Curt Palme wrote: | | WHat I do is check the heat sink compound sticking out the edges of the chips. If it's sticky and comes off on your finger or screwdriver, it should be OK. If it's hard and you can't move it around with a screwdriver end, then I would pull the remaining boards and redo the compound. |
Will do. Thanks.
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Sun Jun 06, 2010 11:56 am Post subject: |
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I'm glad you are making progress on the tube.
Was there anything wrong with the boards?
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Ironman1965
Joined: 28 Jun 2007
Posts: 98
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| Posted: Sun Jun 06, 2010 6:16 pm Post subject: |
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| Mark_A_W wrote: | I'm glad you are making progress on the tube.
Was there anything wrong with the boards? |
Thanks Mark. The boards I sent checked out fine, although I sent the HV board and not the V-Drive (guess I didn't understand exactly which boards Curt was telling me to send). I will eventually send Curt the V-Drive for testing as well. Just to be on the safe side though I bought a remanufactured V-drive board from Curt that I put in the PJ. I don't plan on having another cracked tube if I can help it.
And BTW I won't be running any conditioning procedure on the tube this time  . Just to be on the safe side. (this is the green tube from the set I purchased from Terry)
Somebody asked at one point why I conditioned the tube in the first place. As I said, I thought the conditioning wouldn't harm the tube. Whether or not this damaged the tube is irrelevant at this point. I was aware that "new" NEC tubes needed no conditioning. My concern came from the packaging the tube arrived in. The tube was packed well (in foam rubber) but it was not the original packaging. I had read that over the years VDC's rebuilds became pretty much indistinguishable from the originals. I was also unaware that they stopped rebuilding NEC's, which makes no sense because they charge a core charge on the old tube. Why would they want the old core in good condition if they don't plan on rebuilding it? I wasn't implying that VDC was ripping people off. I was trying to say that I was erring on the side of caution as mis-communication is always a possibility. Especially on my part as I'm no electronics or CRT tech.
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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 Jun 06, 2010 6:27 pm Post subject: |
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BTW, that V board was on an exchange basis, so please send your V board back to me sooner than later. 
I may not have mentioned that in the emails, sorry!
Normally I'd sell outright, but I don't have many V board spares..
Thanks!
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