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Subject:	Yellow spots in video projectors?
From:	Allan Ayres <[log in to unmask]>
Reply To:	Informal Science Education Network <[log in to unmask]>
Date:	Tue, 13 Apr 2010 09:57:25 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (48 lines)

ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************

Hi everyone,

I posted this yesterday on the Science on a Sphere list, but I figured  
I'd ask here as well.

I'm wondering if other video projector users have had yellow spots  
develop in their images over time.  We've particularly had problems  
with Sony projectors, including two of the VPL-FE40 units in our SoS  
installation and an older VPL-PX40 we took out of service a few years  
ago because of the spots.  (We don't have experience with any other  
brands, so I don't know if they have similar problems.)

I dug out the old VPL-PX40 and took it apart, and it appears to be the  
blue LCD element itself that has the splotches in it.  That's a  
bummer, as I suppose an LCD panel is more expensive to replace than,  
say, one of the polarizers or other little plastic filters that are  
scattered around the system (i.e. probably some significant fraction  
of the cost of a new projector).

Anyway, I just wanted to throw the question out to see if anyone else  
had faced this problem.  If so, has anyone had any success with  
getting projectors repaired and/or cleaned?

Thanks!
~~~~~~~~~~~~~~~~~~~~~~~~~
Allan Ayres
Exhibit Developer
Lawrence Hall of Science
University of California, Berkeley
Berkeley, CA 94720-5200
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