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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Sat Sep 29, 2012 9:38 pm Post subject: Marquee blue focus issue -FIXED |
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I looked at my friend's Marquee 9000, and found one strange problem, not a major one, but annoying.
So the problem is only with the blue tube, the electronic "focus" option has some strange effect on blue brightness consistency, moreover it is varying with focus adjustment.
It is really hard to explain what is happening so I made some draws.
So look at picture "no1" let's imagine the black background is the 'full white' test pattern on the blue tube, while the grey oval lines are moticeably darker than the other part of the tubeface. It looks like a wear pattern, but this can be moved.
Adjusting more the focus, we get the "no2" picture, the oval darker 'things' got bigger. Adjusting more and more the focus the two oval lines are touching themselfs so they look like in "no3" picture. With very low focus level we can eliminate the darker areas, but then it's very unfocused. I guess this is some kind of interference, but how to fix it?
FIX: fine alignment of the focus coil made the problem almost completely disappear.
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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
Last edited by gjaky on Tue Oct 29, 2013 9:54 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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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sat Sep 29, 2012 10:26 pm Post subject: |
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Hello
Blue always does that; blue is darkest when it is focussed the best. It is in the phosphor and the tube, and likely only another tube will work better.
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Sun Sep 30, 2012 6:57 am Post subject: |
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Yeah, but the problem is not simply that the blue is not bright enough, more like some portion of the blue is noticeably darker than the other, and looks like a burn-in when all colours are applied, but if I set the focus the darker area moves. I don't think it's normal, also no visible wear on blue.
_________________
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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Phoenixed
Joined: 13 Oct 2011
Posts: 514
Location: The mitten
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| Posted: Mon Oct 01, 2012 6:22 am Post subject: |
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For giggles I would. I have had calibrators tell me the contrast modulation gives them fits.
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Planar PD-8150/Runco LS-5
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Phoenixed
Joined: 13 Oct 2011
Posts: 514
Location: The mitten
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| Posted: Mon Oct 01, 2012 6:57 pm Post subject: |
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gjaky
If you want two more to play with I would be happy to send you my two, just cover shipping.
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Planar PD-8150/Runco LS-5
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Mon Oct 01, 2012 7:04 pm Post subject: |
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Thanks for the offer. Personally I wouldn't give a single penny for a CMM -but that's only me  . I'll pass this offer to my friend.
_________________
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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Phoenixed
Joined: 13 Oct 2011
Posts: 514
Location: The mitten
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| Posted: Mon Oct 01, 2012 7:13 pm Post subject: |
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| gjaky wrote: | | Thanks for the offer. Personally I wouldn't give a single penny for a CMM -but that's only me . I'll pass this offer to my friend. |
I hear ya brother.
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Planar PD-8150/Runco LS-5
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