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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Sun Feb 11, 2018 2:51 pm Post subject: Vertical lines on red/blue grid are very thick |
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Hello,
I am setting up a BG 1209s. I started with a 15KHz signal and everything looks fine. But when I started adjusting for a 40.4KHz signal (1080p72), I noticed that the vertical lines on the red grid look some kind of blurry. It ends up having a white with redish borders.
Where can it come from ? Astigmasim ? But if it is, why with 15KHz signal, does it look fine ?
Thanks for your help
Last edited by Corleone88 on Thu Feb 15, 2018 9:23 am; 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: Sun Feb 11, 2018 3:26 pm Post subject: |
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It looks like your astig is out. At the set frequency, put the contrast to 100, and set the astig so that the dots are perfectly round. I'd start by zeroing out the astig settings to 50 each, and then set the astig magnets around the tubes first.
The Barco dots are very coarse, I'd use an external BluRay disc or the test pattern from a DVDO/Lumagen if that's in the signal chain.
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Sun Feb 11, 2018 3:40 pm Post subject: |
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Thanks Curt. I never did the astig, I suppose that it is explained in your CRT primer.
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Thu Feb 15, 2018 9:21 am Post subject: |
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I started to think that my problem is not related to bad astigmatism adjustement.
With internal patterns (15KHz), my vertical lines (red, green and blue) of the grid have the same width and the overall picture looks fine. As soon as I put external signals (1080p60 or 1080p72), the green vertical lines look thin but the red and blue ones have their width doubled (or even more). The horizontal lines (red, blue and green) look thin in any case.
Can it be caused by a problem on one of my cards (vertical deflection ?)?
Thanks for your help
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Thu Feb 15, 2018 7:20 pm Post subject: |
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Here are some better pictures to see the issue.
Internal signal 15Khz (except the red astigmatism that misadjust recently, it looks fine to me):
External signal (HDMI 1080p72):
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Sat Feb 17, 2018 8:01 am Post subject: |
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Curt, can you confirm me (with these new pictures) that it is caused by bad astigmatism adjustement? Even if horizontal lines look fine.
Thanks
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