Hey,
So I've got this LCD projector: Sharp PG-C45X LCD.
Stats here http://www.projectorcentral.com/Sharp_PG_Series-Notevision_PG-C45X.htm . Its producing a strange mark with yellow discoloration near the upper right of the image causing it and was wondering if you knew how to fix it? I just got it and it's used and not under warranty. Is there dust on the LCD or do i need to replace the UV filter or what? I have experience taking apart and fixing electronics but I'm not really sure what's going on here. Any help would be really appreciated. Let me know. I'm kinda against the clock on this one, so any quick helpful responses would be really great. Thanks!
http://img.auctiva.com/imgdata/7/4/1/5/2/8/webimg/171626333_o.jpg
http://img.auctiva.com/imgdata/7/4/1/5/2/8/webimg/171626378_o.jpg
Full photos can be found here.
http://img.auctiva.com/imgdata/7/4/1/5/2/8/webimg/171626333_o.jpg
http://img.auctiva.com/imgdata/7/4/1/5/2/8/webimg/171626378_o.jpg

I had a Sony HS10 with a problem like that, it turned out to be a bad prism block. Expensive to fix. Here's pictures.

http://www.avsforum.com/avs-vb/showthread.php?t=984458&highlight=hs10+prism+block

My old Sony VPL400 developed a yellow spot similar to what was shown here and it was a burned blue polariser plate. It was replaced under warranty.

It's the blue chip most likely. Can be caused by many things, but if it is not under warranty it is probably not worth fixing.

Doesn't look like a polarizer to me, mine went on my old HS10 and it was more of a yellowish tinge on the left half of the picture, much less defined that what is shown here. It's easy enough to check that if you're willing to open up the PJ and find the polarizer. When I took my blue one out, you could easily see where it had faded and it corresponded to the same area on the picture. Those are something you can buy and replace yourself for a few hundred $$, the actual LCD blocks are much more expensive and you'd have to send it in. Unfortunately, I think it's your block (or part of it) that has failed.

I'm sure it's the polariser. When mine went on my old Sony VPL400 there was a yellowish circle near the center of the picture. I got the old plate back and you can clearly see where the burn is located.

Hi George,
Do you happen to have any photos of the old burnt polariser?

Thanks,
John

Not George, but here's a shot of my burned out polarizers, one clearly much worse than the other:

http://i172.photobucket.com/albums/w16/jdlive/HS10%20surgery/IMG_0080.jpg

JDLive,
Can you please let me know the dimensions of the burnt out polariser? I'm trying to find a suitable replacement for my LCD rear pro television.

Thanks,
John

JDLive,
Can you please let me know the dimensions of the burnt out polariser? I'm trying to find a suitable replacement for my LCD rear pro television.

Thanks,
John

I don't have them any longer, but IIRC they were slightly more than an inch wide.

It's not the polariser plate, as you can clearly see the pixels defined in the problem area. A burned polariser has a cloud like, hazy look to it. This is a bad LCD panel (I've had both VPL400Q and HS10 projectors) and will cost $1000 to $2000 to fix if out of warranty, since it usually requires the entire "prism block" to be replaced. The prism block is a sealed optical unit that includes all 3 LCD panels aligned and attached to it.

-D

Basically it sounds like a repalcement projector is the best course of action.