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Horizontal lines on a Marquee 8500

 
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backslap



Joined: 26 Jan 2009
Posts: 36
Location: the netherlands

Posted: Sun Jan 17, 2010 4:26 pm    Post subject: Horizontal lines on a Marquee 8500

Hi,

I want to show you guys a picture of a full white screen of my Marquee 8500:




Am I correct in assuming this isn't the notorious banding issue caused by the use of Bow?

I am seeing this (looks more dramatic on camera than it does in real life) on all resolutions.

What could it be?


Grtx, Elwin


PS. the brown blob is a feature of my camera.
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AnalogRocks
Forum Moderator


Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G

Posted: Sun Jan 17, 2010 4:51 pm    Post subject:

Was this projector ceiling mounted before and now you have it on the floor or vice versa? That looks like a windows task bar burnt into the tubes.

BTW open that camera up and clean it will ya? Laughing

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Nashou66



Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY

Posted: Sun Jan 17, 2010 5:08 pm    Post subject:

Nope, that is the classic Marquee banding.

read this and try your best shot.

http://www.etechvideo.com/techtip10.htm

Athanasios

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Marquee Modifications and Performance Enhancement
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backslap



Joined: 26 Jan 2009
Posts: 36
Location: the netherlands

Posted: Sun Jan 17, 2010 7:01 pm    Post subject:

Alright! I already thought it was banding but playing with Bow didn't solve anything...

Must have been the convergence tweaks I made to the green raster.

It's fine now after resetting the convergence, thanks!
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draganm



Joined: 08 Mar 2006
Posts: 8990
Location: Colorado

Posted: Sun Jan 17, 2010 9:19 pm    Post subject:

AnalogRocks wrote:
That looks like a windows task bar burnt into the tubes.
that brown stripe is the CRT re-fresh scan. You have to set the camera for shutter priority 8 to get rid of it. Took me a while yesterday to figure this out which is Ironic because I was trying to actually take a picture of banding. When you use too mcuh Bow you usually get only 1 big band in the middle. BTW, the brown stripe on the left is actual wear in his pic Smile


W-banding stock bd..JPG
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W-banding stock bd..JPG


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