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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 Sep 15, 2009 12:23 am Post subject: Wanted: Bad NEC system boards |
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While working on an NEC PG+ system board that I had no spares of, I may have just nailed the no sync/scrambled menus/no pix/intermittent pix/only syncs at 480i problems that have plagued these boards for years now.
I went from all of the above problems with the one board to rock solid sync/menus/everything. I almost fell off my seat. 
Anyways, I've always told a bunch of you to hang onto the old boards in case someone ever found the repair. I now want a bunch of bad system boards to test my theory in. I think I have 2-3 more here that I can work with, but I'd like a bunch more. If what I came across today does indeed work, I'd be happy to do a bunch of repairs at big discounts to prove the repair works.
Let me know. I'm running this board overnight, but right now it's solid.
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deronmoped
Joined: 03 Nov 2006
Posts: 1154
Location: San Diego
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| Posted: Tue Sep 15, 2009 5:17 am Post subject: |
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I will take a look and see if I got one.
Deron.
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Tue Sep 15, 2009 10:48 am Post subject: |
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Curt, PM Tinman and see if he can get some from Doug (?).
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Sep 15, 2009 2:34 pm Post subject: |
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| Mark_A_W wrote: | | Curt, PM Tinman and see if he can get some from Doug (?). |
Mark, Doug wont give up any because of his records. At least thats what he told me when I talked to him about this before he had his current situation. I had some success also with system boards, altho different fix then what Curt found, And needed more boards to test on. I even posted the same thing Curt just posted and got 1 response. I had some success with an XG board also but with only 1 bad board there also I couldn't continue so I stopped looking as there seemed to be no interest. No one else responded to the request.My stuff is all in storage now so I cann't test Curts find here. I hope you guys send him some boards to confirm.
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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 Sep 15, 2009 2:41 pm Post subject: |
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It's still running fine, I've run resolutions from 480p to 1024p. I'll play more with it before I send it back to the customer, but for this one, I think I nailed it. I'm VERY pleased, this was one of the 'unrepairable' things that has been pissing me off about CRT projectors. 
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Sep 15, 2009 2:49 pm Post subject: |
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| Curt Palme wrote: | | It's still running fine, I've run resolutions from 480p to 1024p. I'll play more with it before I send it back to the customer, but for this one, I think I nailed it. I'm VERY pleased, this was one of the 'unrepairable' things that has been pissing me off about CRT projectors. |
I'm sure you got it on that one Curt. From when I was experimenting, there wouldn't be any change until I was in the right place. Of course I could cause the system board to return to its non syncing form by reversing what I did, then sync again when corrected. Did you try reversing what you did to confirm?
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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 Sep 15, 2009 3:13 pm Post subject: |
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Hell no, not on this one. 
But I will on others, and will change one part at a time. I really didn't think that I found the problem, but I will narrow this down, maybe even today.
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Tue Sep 15, 2009 9:19 pm Post subject: |
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Doug has records?
Kinda irrelevant at this point in time, surely?
It's not like there are any 8" CRTs in "active service". We have them all now.
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