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Sometime this kind of thing happens due to heat. If the projector is  
only intended to be used in the horizontal orientation and it is aimed  
up or down, the heat does not convect right and the light valves get  
exposed to excessive heat. What was the orientation of the projector?  
is it speced for this orientation? Some are, some aren't. When this  
happens the light valves need to be replaced. The appearance tends to  
get worse over time. Sorry!

Stephen Miles Uzzo
New York Hall of Science
47-01 111th Street
Flushing Meadows Corona Park, NY 11368 USA
http://www.nysci.org/learn/1431359/staff/senior_staff#uzzo
V +1.718.699.0005 x377
F +1.718.699.1341




On Apr 13, 2010, at 12:57 PM, Allan Ayres wrote:

> 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
> [log in to unmask]
>
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