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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Thu Mar 10, 2011 2:54 pm Post subject: Help! NEC XG 1100 Green tube CRACKED - Why?? |
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Just my luck (Yet again) my NEC XG1100 has died, I turned it on about 7PM last night, and let it run while I was out of the room. I was out of the room for longer than I expected (a couple hours). When I returned the last thing I expected was to see my XG turned off (I was going to do some xbox so I had it and the XG on to warm up).
Anyway, I went to turn it on because I knew I already had it on before, once I tried turning it on I saw a huge arc right on the green tube where the HV Lead goes, I immediately shut the projector off after that.
Anyone have a slight Idea what its doing? the XG doesnt give an error code for this one...
Last edited by Jeremy112 on Thu Mar 10, 2011 3:24 pm; edited 1 time in total
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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 Mar 10, 2011 3:01 pm Post subject: |
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SOunds like the green HV lead has gone bad. MAke sure the tube neck hasn't snapped, but it sounds like the hV lead needs to be replaced.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Thu Mar 10, 2011 3:07 pm Post subject: |
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Hi Curt,
I have been suspecting a possible HV lead issue, I did notice for the past few weeks that every once in a while the image will "snap" on the screen, for a second and it wont happen until the next time I turn it on (before this happened obviously)
I will check the tubes out and *hope* they are OK still...
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Thu Mar 10, 2011 3:19 pm Post subject: |
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I found the Problem...
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Thu Mar 10, 2011 3:37 pm Post subject: |
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That almost always happens because of pressure in the coolant chamber.
These machines are getting old... First, the sealants on the coolant chamber are somewhat vapor-permeable. Second, the glycol in the coolant chamber is hygroscopic, which means it absorbs moisture from the air. So, over the years, the volume in the cooling chamber actually increases to the point where there isn't any room for it to expand anymore. Eventually, usually when it warms up, the pressure in the cooling chamber combined with the vacuum on the tube face makes the glass fail.
Bummer.
SC
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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 Mar 10, 2011 3:38 pm Post subject: |
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It could be a bad V board that caused the image to shoot way off the screen, an intermittent short in the tube judging from your snapping sounds in the past, excessive glycol pressure within the cooling chamber, or just really bad luck.
The bad news is that it's the green tube, the good news is is that it was pretty worn anyways.
I do have some worn green tubes, but I think they are better than what you have in the set. I can't remember if I repaired your V board when I posted about the V board nuking the tubes potentially. If not, you're best to get that rebuilt before you put another tube into the set. Email me at curtpalme@shaw.ca and I can send you pix of the green tubes that I have to see if you want one.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Thu Mar 10, 2011 3:39 pm Post subject: |
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Oh, and if you take off the other two lenses, you'll probably find that the other two are completely full with little or no air bubble at the top of the tube. The same will likely happen to them eventually if a little coolant isn't bled off.
SC
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Thu Mar 10, 2011 3:43 pm Post subject: |
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Ooopss... Looked like a pressure failure... I didn't see the part about the HV snapping. Never mind. What Curt said.
SC
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Thu Mar 10, 2011 3:47 pm Post subject: |
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Guys, thank you all for your comments, Curt ill be glad to email you, I honestly could care less what the tube looks like as long as it works, and I never did have you repair the board, so Ill probably send that to you to get done,
And it could be a stroke a bad luck for me... I own 3 NEC projectors, this makes #2 to die (although I will admit #1 was in horrible physical condition)
Ill take the lenses off the other 2 tubes and check out the air bubblage on it as well...
And, it makes perfect sense that it would be the green tube since I have a 9PG Xtra NOS with mint 9+ tubes (maybe 10 havent gotten that far into it), but theres no way in hell im ripping apart my last working CRT projector, I'll probably use it until the XG gets repaired.
Curt, Ill send that email to you in about 10-15 mins from this posting
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Thu Mar 10, 2011 4:18 pm Post subject: |
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Curt, I sent the email to you..
As for my red and blue tube they are thankfully not cracked anywhere, however there are no air bubbles at ALL so I assume the tubes need bleeding?
And you were right about the green tube being rough Curt, the blue and red look much better than the green (which is also responsible for my wonderful shades of off grey's and blues im sure)
Oye... I wish this wouldn't have happened or at least have it happen to my old worn out NEC 9PG plain...
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Thu Mar 10, 2011 4:59 pm Post subject: |
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| ecrabb wrote: | | Ooopss... Looked like a pressure failure... I didn't see the part about the HV snapping. Never mind. What Curt said. |
That's what I thought too on first glance, and I actually posted something agreeing with you.  I just looked at it again. That's not the chamber face that cracked, it's the tube face. Probably an HV failure running the image off the edge of the phosphor or something like that?
And it looks like a bunch of the glycol drained into the cracked tube. Better make sure it didn't leak anywhere else.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Thu Mar 10, 2011 5:22 pm Post subject: |
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| garyfritz wrote: | | ecrabb wrote: | | Ooopss... Looked like a pressure failure... I didn't see the part about the HV snapping. Never mind. What Curt said. |
That's what I thought too on first glance, and I actually posted something agreeing with you. I just looked at it again. That's not the chamber face that cracked, it's the tube face. Probably an HV failure running the image off the edge of the phosphor or something like that?
And it looks like a bunch of the glycol drained into the cracked tube. Better make sure it didn't leak anywhere else. |
I just got the projector off its cart so I can put the 9PG Xtra on it, I checked the set over for about 20 minutes looking for glycol leakage and there was none that I could spot, it appears to have seeped into the tube.
I am wondering if the G2 drive could have been too high? I also suspected that it might have been the V board failure and that the image went off the tube face.
Sad as it is to say, I wish that if these damn things fail, they could at least do it while I'm around, this is the 2nd NEC set I've had fail on me while I wasn't home.
Also Im looking at the CRT replacement guide to help me remove the old tube, since I have never done this before. So if anyone has removed a tube (preferrably from a NEC set similar to mine) and could give me some details on how to do it to make it go more smoothly I would appriciate it.
And lastly.. Is there any high voltage left in the set? I have had it unplugged for a couple hours now.
*wishes a 9" CRT set would fall into his lap*
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Thu Mar 10, 2011 6:34 pm Post subject: |
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| garyfritz wrote: | | That's not the chamber face that cracked, it's the tube face. Probably an HV failure running the image off the edge of the phosphor or something like that? |
judgeing by the big chunk of missing Phosphor on the right hand side it looks like that's where the problem originated. The glass popping there would have released a lot of energy causing the Phosphor to fly off, strongly suggesting a Scan failure.
| Jeremy112 wrote: | | Sad as it is to say, I wish that if these damn things fail, they could at least do it while I'm around, this is the 2nd NEC set I've had fail on me while I wasn't home. |
that's easy, use the OFF button when you go out for dinner or bowling
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RogerH
Joined: 14 Jul 2010
Posts: 64
Location: Minneapolis
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| Posted: Thu Mar 10, 2011 8:42 pm Post subject: |
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I recently bled the glycol in a quantity of XG air-coupled tubes and was shocked at the pressure in some-they literally shot a geyser when I pulled the hypodermic out.
If you don't have any bubbles in the other tubes I wouldn't be surprised if excess pressure was the cause. Start with a few hundred pounds of atmospheric pressure on the tube face, a vacuum inside, and then add to that the pressure of expanded glycol with very little place to go.
The face of the CRT is thicker than the cover glass, but it has a lot more force on it than the cover glass.
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Jesse S
Joined: 12 May 2007
Posts: 209
Location: Etobicoke
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| Posted: Fri Mar 11, 2011 6:19 am Post subject: |
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Not an issue with the XGLC's right?
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kschmit2
Joined: 09 Mar 2006
Posts: 1141
Location: Heidelberg, Germany
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| Posted: Fri Mar 11, 2011 10:34 am Post subject: |
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IIRC XGLC tubes use the same tube face with a liquid cooling chamber under the LC assembly.
I.e. tube face -> liquid cooling chamber -> front glass -> LC chamber
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri Mar 11, 2011 3:28 pm Post subject: |
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I think this is an issue with ALL NEC XG projectors as Curt had pointed out in a post from a while ago.
Just because its LC doesnt mean it uses a different V board, it uses the same one.
I would recommend getting it fixed by curt, I decided not to and look what it cost me! 
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When I'm asking for a Model number, that doesn't mean I'm asking for a nude photo with your number on it
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Fri Mar 11, 2011 3:49 pm Post subject: |
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Kai, doesn't the LC assembly have tube face -> glycol -> C-element -> Lenses? I don't think there IS any front glass in an LC projector. The tube face / glycol / C-element IS the LC chamber. See e.g. the AC and LC diagrams at http://www.curtpalme.com/CRTPrimer_13.shtm.
And I don't think pressure in the chamber is an issue because the bellows can expand. But I'm no expert on LC units so I'm guessing there.
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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: Fri Mar 11, 2011 3:49 pm Post subject: |
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It's never really been proven that glycol pressure can break a tube, but I'd say it's certainly a possibility. No question that an intermittent vertical board will take a tube out, I've seen it 5 times now, and one of those was right in a customer's home, right in front of me.
It's $100 incl return shipping to repair any XG V board, LC or non LC. Cheap insurance that you won't have a tube failure due to a failed V board.
No question that it's also a good idea to bleed the XG tube glycol as well.
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jarseneau
Joined: 06 Nov 2007
Posts: 323
Location: WI
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| Posted: Sat Mar 12, 2011 7:10 pm Post subject: |
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Ugh. Really sorry to hear about your breakage. If you want it, I have a green you can have but it has some burn in.
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Jerry
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