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Marquee.. Possible convergence board improvements.!!
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dvh99



Joined: 25 Dec 2009
Posts: 2158
Location: nederland

Posted: Wed May 29, 2013 4:05 pm    Post subject:
would something like this work gjaky you think?

bias.png
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active bias circuit
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bias.png

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1 answer always poses multiple questions.
marquee 9500ultra HD10L moome hdmi1.3 v3+ some mods.
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gjaky



Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary

Posted: Wed May 29, 2013 4:14 pm    Post subject:
Yeah, it looks good for a starting, but of course needs to be taylored to the convergence amplifier. But first it would be important to understand where is the drifting comes.
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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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dvh99



Joined: 25 Dec 2009
Posts: 2158
Location: nederland

Posted: Wed May 29, 2013 4:19 pm    Post subject:
agreed, i have the layout for the circuit btw.


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1 answer always poses multiple questions.
marquee 9500ultra HD10L moome hdmi1.3 v3+ some mods.
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gjaky



Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary

Posted: Wed May 29, 2013 9:18 pm    Post subject:
Unfortunately I haven't touched a marquee in a year at least, so can't help much with real test results.
I would try to observe the signals with a good multimeter/oscilloscope on HDM, VDM, where is the static convergence correction, as Mike pointed out earlier, then on the convergence board.
BTW, the green and blue horizontal static convergence is driven by the same IC (U7) on the HDM, the red has a separate IC (U11), so this is an other clue.
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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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View user's photo album (1 photos)
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