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Green CRT problems - Barco Retro 801s

 
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Brooklyn



Joined: 17 Sep 2007
Posts: 494
Location: Morgan Hill, CA

Posted: Tue Dec 11, 2007 8:37 am    Post subject: Green CRT problems - Barco Retro 801s
Hello, I have a Barco Retrographics 801s. The problem I am having is that there is always a blank raster of sorts on the CRT that won't go away. Even if I turn the G2 all of the way down, and have no picture sent to it, there is still an extra blank raster there. The G2 pot does adjust the regular raster fine, but this extra brightness is always there.

I tried swapping the RGB out and neck boards and there was no change. What could be causing this?
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Curt Palme
CRT Tech


Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC

TV/Projector: All of them!
Posted: Tue Dec 11, 2007 1:28 pm    Post subject:
Either you're seeing phosphor afterglow, or the tube itself is bad (bad cutoff).
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Tom.W



Joined: 09 Mar 2006
Posts: 6635
Posted: Tue Dec 11, 2007 3:26 pm    Post subject:
Sounds like a G1 short.

http://www.sencore.com/custsup/pdf/TT238.pdf
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Brooklyn



Joined: 17 Sep 2007
Posts: 494
Location: Morgan Hill, CA

Posted: Wed Dec 12, 2007 1:22 am    Post subject:
It is not afterglow, so it sounds like a problem that I will just have to live with? Unless I can get ahold of one of those special CRT testers to test the G1?
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