First LCD projector setup

[BravoOrig]

I'm new to this forum and want to share my first results.
LCD Panel: Chisholm 20/10 without power supply 16.7 million colors, 640x480 resolution I believe.
OHP: Bell & Howell without it's top glass and bad bulb. Not sure of the model #, even today.
Bulbs: 24 EVC long-life bulbs
Screen: Dalite Challenger 50x50" portable screen, old but in excellent condition at a rural junk store, pretty much free with a 8mm projector, and slide projector.

After contacting projectorcentral.com, I recieved scanned images of the brochure for my panel, plus the pinout and voltage/amp requirements. My father then ordered a new powersupply off the net somewhere. My bulbs are in the 8200 lumens area I believe, and I went with the longer life version, plus got a teriffic deal of 24 bulbs off eBay for around $30. I can watch tv for most of the year 24 hours a day, if I had the time. The OHP I got off eBay without top glass and only was reported the fan spun up, replacing the bulb fixed it of course.

At first when I visited my family for Xmas, and received the powersupply, the panel would not work. It seems to require a certain sequence of what you plug in, i.e. powersupply, and video, before it will sense each correctly. Plus it has to sense a bright light to turn on. To my suprise it worked fine at home. A couple of stuck pixels, that soon went away and I got about a 60" diagnol image on my screen. The stuck pixels come back when I access the panels menu, but go away again. Right now it's sitting on a rolling footstool, and creates a slight keystone effect shining onto the screen but I love it. Hope to get a tall enough cart for it soon. The OHP's top cutout is shaped like a peice of paper from top to bottom, so I had to lay the panel on it different, and turn the OHP's lense/reflecting armature, to show it all correctly. The panel is also capable of reversing the image, for rear projection. I have only been using a videocable so far, and will try the S-VHS connection today. It can be a little grainy, but is really like a theater viewing experince. The wife loves it and I only spent under $200, thanks to eBay, and that's with shipping.

The only problem I have, and I never thought I would have this, is that where I need the OHP to sit, behind our couch, for best viewing, creates too big of an image! Measured roughly on our wall, with entertainment center in the way, it's a 152" image, that's 8 foot vertical, and 10ft wide! I'm hoping to still sit the projector there, and buy screen material off eBay. I plan to hang the screen from the ceiling, on a frame, and have it hinged to go up and hook onto something, to lay horizontal with the ceiling, during non-use.

[faithblinded]

The problem you're having is because the focal length on your triplet(if you have one, your objective lens) has too short of a focal length. If you get a longer focal length objective lens, you should be able to have a smaller screen.
Use Brainchild's handy dandy lens figurer doo dad thingie here to figure out what focal length you need to get the desired size.
http://www.lumenlab.com/focal_calc.php