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Meemil
Joined: 25 Mar 2016
Posts: 96
Location: Finland
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 Link Posted: Fri Dec 21, 2018 3:26 pm Post subject: Vertical noise on picture |
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Hey,
I jusy today noticed small vertical lines running thru the picture. They're most noticeable on external signal, and more so with high bandwidth ones (eg. 1080p 72hz). I spent the whole day diagnosing the problem and found out that removing the stig amp wires fixes it. I tried a swap stig amp but without luck.
This seems just bizarre, what could be the next place to look for?
Update:
Taking out the focus wires while SAB is connected fixes it too!
Update 2:
Dang I keep editing this lol. But it seems that taking any tube out of either SAB or FGM fixes it. I've tried swapping the wires all the way from VDM to SAB and FGM. Seems like there is no clear pattern to this, which doesn't indicate a board problem.
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gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
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| Link Posted: Fri Dec 21, 2018 7:42 pm Post subject: |
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There is a grounding problem with the astig amplifier, do a search on the forum. Adding extra grounding should eliminate this noise.
_________________
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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Meemil
Joined: 25 Mar 2016
Posts: 96
Location: Finland
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| Link Posted: Fri Dec 28, 2018 12:29 am Post subject: |
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Thanks Gjaky that did the trick! Did some research and the output is now way clearer after bunch of ground bridges to different boards.
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