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noos@xp37+
Joined: 17 Jun 2008
Posts: 464
Location: Berlin/Munich
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| Posted: Mon Mar 18, 2013 11:04 am Post subject: 9500 Ultra - more than scanlines - picture and internal pat |
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Hello,
I have a problem that can be ignored, but it is visible in bright scens. It is like extra scanlines that are a little thicker than normal scanlines, and run up or down through the picture. They are as dense as scanlines, and they are not wide spread like ground loops (I have checked for this). I have those extra lines on red and green (blue might be too soft), and they are also present in internal test patterns.
Barclay66 pmed me some very good "German" ideas, that I include here if someone is on the hunt for a similar fault:
Eine Möglichkeit ist das CLM, wenn es mit seinen digitalen Signalen auf die Videokette "saut".
- Auch kann das LVPS der Verursacher sein (z.B. unsaubere +/-85V für die VNBs).
- Das HVPS kann in Frage kommen (unsaubere G2-Spannungen).
- Die VNBs sind möglich (aber dann meistens nur eines davon).
- Bei senkrecht durchlaufenden Störungen kann es auch das VDM und/oder das SAB sein.
- Es gibt auch Fälle, bei denen nur die Lage von Kabeln eine Ursache war.
- Oder irgend ein anderer Rotz (dirt) , der da auf die Videokette einstrahlt.
Thanks for your ideas
noos
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Mon Mar 18, 2013 11:17 am Post subject: |
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Just a translation of the potential sources:
- One cause can be the CLM, especially if it injects digital noise into the video chain
- Another can be the LVPS (e.g. noise on the +/-85V rails for the VNBs)
- The HVPS can be another source (e.g. noise on the G2 rails)
- The VNBs themselves can cause this (but usually only one of them at a time)
- If the noise runs vertically through the picture it can be caused by the VDM and/or the SAB too
- There have been cases where the routing of cables did this
- Or it could be any kind of noise that gets caught in the video chain
Regards,
barclay66
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noos@xp37+
Joined: 17 Jun 2008
Posts: 464
Location: Berlin/Munich
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| Posted: Mon Mar 18, 2013 11:27 am Post subject: |
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Thanks for the translation Jorge - I do not touch such a piece of crt art an try to transalte it.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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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: Mon Mar 18, 2013 1:28 pm Post subject: |
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| noos@xp37+ wrote: | | Thanks for the translation Jorge - I do not touch such a piece of crt art an try to transalte it. |
He could have left it in German, and I would still be able to read it. 
All of the above are good ideas, you'll need to swap some boards to see where the problem is.
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Mon Mar 18, 2013 3:33 pm Post subject: |
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| Curt Palme wrote: | | noos@xp37+ wrote: | | Thanks for the translation Jorge - I do not touch such a piece of crt art an try to transalte it. |
He could have left it in German, and I would still be able to read it.
All of the above are good ideas, you'll need to swap some boards to see where the problem is. |
correction, take an educated guess what it says as it`s obvious because of the terms cmm lvps etcetera.
_________________
1 answer always poses multiple questions.
marquee 9500ultra HD10L moome hdmi1.3 v3+ some mods.
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