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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Thu Jan 24, 2008 2:28 pm Post subject: Did anyone every figure out how to fix NEC "scrambled m |
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I have looked at threads about this and was wondering if anyone had figured out how to repair the system boards from NEC's that exhibit the dreaded scrambled mess problem ?
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dbaisey
Joined: 09 Mar 2006
Posts: 821
Location: Southern Cal LA / Seattle WA
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| Posted: Thu Jan 24, 2008 2:52 pm Post subject: |
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No fix for these that we know of. My recovery % of one is pretty low. If no com can be made I cant do a thing. To be sure it requires the Osc board also. In some cases the D conv board depending on the exact model and version. For some reason once the earth ground to neutral (over) voltage gets to it its done for. Doug
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Thu Jan 24, 2008 2:55 pm Post subject: |
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I had an OSC board, swapping it in made no difference, I'll try the D-Conv board, see if that will pull it back...
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Thu Jan 24, 2008 2:59 pm Post subject: |
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| Elaine Benes wrote: | | I had an OSC board, swapping it in made no difference, I'll try the D-Conv board, see if that will pull it back... |
No effect when the D-Conv board and OSC boards have been switched. . . . .
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dbaisey
Joined: 09 Mar 2006
Posts: 821
Location: Southern Cal LA / Seattle WA
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| Posted: Thu Jan 24, 2008 3:00 pm Post subject: |
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I meant to test as a board set. If the system board is bad.. its bad. Doug
At the projector receptical (unplugged) check earth ground to neutral voltage (large spade) then go around and start turning things on checking the meter. Esp dimmers unless its a designated circuit.
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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 Jan 24, 2008 3:08 pm Post subject: |
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I've spent a couple of hours one day comparing a working system board to a non syncing one. Changed a bunch of caps... nada!
I'm convinced though that it's NOT a chip problem. I'm sure it's repairable, it's just a matter of FINDING THE BAD PART.
(but then, isn't finding the bad part ALWAYS the cure? 
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Thu Jan 24, 2008 3:13 pm Post subject: |
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| dbaisey wrote: | I meant to test as a board set. If the system board is bad.. its bad. Doug
At the projector receptical (unplugged) check earth ground to neutral voltage (large spade) then go around and start turning things on checking the meter. Esp dimmers unless its a designated circuit. |
Don't worry, its not MY power that was bad, this was damaged before I got it. Unfortunately, you can't see if the "scrambled mess" is there if you can only turn it on to check for power up...
Curt: I hope to God you find the culprit someday, it is as annoying as hell. Especially when this one will synch up occasionally, and run just fine, but then it won't again...damn annoying...and I have every board from a scrapped XG EXCEPT the system board....
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dbaisey
Joined: 09 Mar 2006
Posts: 821
Location: Southern Cal LA / Seattle WA
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| Posted: Thu Jan 24, 2008 3:15 pm Post subject: |
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Same here many times. Also sent in to engineering and the response was 'no fix available' check line power before replacing Doug
Elaine if you replace it then it wont annoy you. At some point it got whacked so I doubt its going to just go away but I agree its annoying to work on also. You think you have it until the next mornings run out...
Last edited by dbaisey on Thu Jan 24, 2008 3:35 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 Jan 24, 2008 3:21 pm Post subject: |
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Well I've got about 20 assorted system boards here from various NECs, so I'm in good shape. For bad parts..
What I need is the NEC extender boards (nudge nudge, wink, wink)
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dbaisey
Joined: 09 Mar 2006
Posts: 821
Location: Southern Cal LA / Seattle WA
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| Posted: Thu Jan 24, 2008 3:42 pm Post subject: |
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If anyone can mfg a duplicate set PM me.
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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 Jan 24, 2008 3:45 pm Post subject: |
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DAMN those are PRETTY!
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benareeno
Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada
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| Posted: Thu Jan 24, 2008 6:34 pm Post subject: |
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are there relays on the sytem board?? I had a rptv once that would only synch to 480i..1080i would cause a very similar scrambled mess and the fix had to do with the relays...seems similar enough.
Ben
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Tinman
Joined: 09 Mar 2006
Posts: 1326
Location: Carson City Nevada
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| Posted: Thu Jan 24, 2008 8:00 pm Post subject: |
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I have some ideas about this. Pretty good with this type of logic, and talked to Doug about it many times. But without and extender card, we'll never know.
Marc
_________________
This space for rent.
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Brooklyn
Joined: 17 Sep 2007
Posts: 494
Location: Morgan Hill, CA
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| Posted: Thu Jan 24, 2008 8:57 pm Post subject: |
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Switching out the deflection board on mine fixed the problem.
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Thu Jan 24, 2008 10:51 pm Post subject: |
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| Brooklyn wrote: | | Switching out the deflection board on mine fixed the problem. |
Deflection, eh ?
I think I've got one of those....
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Fri Jan 25, 2008 12:09 am Post subject: |
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I swapped the Horizontal Deflection board, and a very, very slight change. It *seems* to lock to a computer at 1024x768 a little better now, but still no lock onto HD 1080i.
Also, I have tried several times to make a new signal entry, it just won't do it, when I pick a spot for the base info, whether I choose "Temporary", or a line, or default, the image disappears and never returns till it relocks onto the only entry in the list...
Makes me think its a memory location corruption issue...
Where is the memory located ? Can it be cleared and reloaded via computer or eeprom flash or something ??
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dbaisey
Joined: 09 Mar 2006
Posts: 821
Location: Southern Cal LA / Seattle WA
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| Posted: Fri Jan 25, 2008 1:38 am Post subject: |
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What model do you have? Doug
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Fri Jan 25, 2008 2:49 am Post subject: |
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It'll be a PG. Oscillation is on the Def board on a PG, there is no oscillator board.
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dbaisey
Joined: 09 Mar 2006
Posts: 821
Location: Southern Cal LA / Seattle WA
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| Posted: Fri Jan 25, 2008 3:05 am Post subject: |
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| Elaine Benes wrote: | | Elaine Benes wrote: | | I had an OSC board, swapping it in made no difference, I'll try the D-Conv board, see if that will pull it back... |
No effect when the D-Conv board and OSC boards have been switched. . . . . |
Thats what Im confused about. Doug
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Fri Jan 25, 2008 3:22 am Post subject: |
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XG1350.
I swapped out the OSC board, the D-Conv board, and then the H Def board, no real change. I was able to change the name of the single signal entry, and it has synched a couple times to 1024x768 60Hz, but that's it, all board changes made no effect, the scrambled mess is still prominently there...
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