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jbmeyer13
Joined: 03 Dec 2010
Posts: 1135
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| Posted: Sun Oct 27, 2013 11:47 pm Post subject: Odd Marquee Green channel artifact |
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So here's a problem that has myself and Nash stumped. This showed up after I replaced a leaking cap on the green segment of the CVA board.
When running 1080p 48/60 my green channel is displaying this large semi-circle that extends down from the top of the image. When I run 800p/72 the semi-circle is not present.
I have done the following:
- replaced the VNB
- replaced VIM
- swapped the R/G VIM cables
- reseated Focus, HDM and CLM
- reinitialized the PJ
- used an LED flash light on tube face (looked for glycol bubbles)
I'm thinking the next thing to change is the CVA...
Any ideas?
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Projector: Modded 9501LC ULtra- MP VIM, Vold VNB, ETECH LVPS, Silver VIM Cables, HD10F's & a V1 case!
Last edited by jbmeyer13 on Tue Oct 29, 2013 3:17 pm; edited 1 time in total
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Mon Oct 28, 2013 12:09 am Post subject: |
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I know we went over this a hundred times but I think if it was board related it be on all tubes. Are you sure it is on the tube face and not a reflection off the C-element? And look at the top of the full field where the curve comes into the black raster it is shifted up the entire length of the "circle" are you sure it is the same on the tube face, that shift?
Nashou
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jbmeyer13
Joined: 03 Dec 2010
Posts: 1135
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| Posted: Tue Oct 29, 2013 3:24 pm Post subject: |
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I shifted the phase and the artifact remained stationary which suggests that it's something on either the tube face or c-element (fungus) but that doesn't explain why it only shows up on 1080p and not 800p. Furthermore, I can't see anything when using my LED lantern. The thought of draining the glycol and trying to remove the c-element is nauseating....
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Projector: Modded 9501LC ULtra- MP VIM, Vold VNB, ETECH LVPS, Silver VIM Cables, HD10F's & a V1 case!
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Tue Oct 29, 2013 3:58 pm Post subject: |
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Hey JB
This should not be hard to figure out. Unplug the conv yoke and see if the problem remains. Vary the V Size; if the problem moves with the size then it is electronic, if not it is a smudge
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Tue Oct 29, 2013 5:49 pm Post subject: |
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Hey Nash
Phase will not move a test pattern
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Tue Oct 29, 2013 9:09 pm Post subject: |
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A friend of mine had a similar pattern on a semi refurbished M9000, we found this thing related to the focus adjustment, and unfortunately it was the most visible when it was in the sharpest setting.
Check this, if it is similar issue:
https://www.curtpalme.com/forum_archived/viewtopic.php@t=32229.html
Tweaking with the focus coil made the problem almost completely go away.
Hope that helps.
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projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Tue Oct 29, 2013 9:52 pm Post subject: |
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| Nashou66 wrote: | Forgot about that thread! you need to update it with the fix 
Nashou |
Yeah, it's a good idea, but when my friend figured it out (months later) that thread was long gone 
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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jbmeyer13
Joined: 03 Dec 2010
Posts: 1135
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| Posted: Wed Oct 30, 2013 4:54 am Post subject: |
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Its the cva...
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Projector: Modded 9501LC ULtra- MP VIM, Vold VNB, ETECH LVPS, Silver VIM Cables, HD10F's & a V1 case!
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