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Posts referring to the InFocus Home SP 4800
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May 24, 2011 9:32 AM
My question is why is the image on my Infocus 4800 so dark.
Here is what I'm working with. I have 3 Infocus projectors that are similar that use the same lamp; X1, X1A and SP 4800. I started with my x1 and a fairly new lamp but the color wheel broke so I looked for another Infocus similar model. I used a Toshiba TLP-s30 while I searched for the replacement Infocus projector.
I ended up finding two Infocus projectors separately. I purchased an X1a from Ebay and a SP4800 from Craigslist. When I picked up the 4800 I noticed it had a dark picture, but it did have an image and the color wheel didn't sound like industrial machinery. I assumed it was dark due to an old lamp and that didn't matter to me since I had a good one in my other unit.
When I placed my new lamp in the 4800 it was brighter, but not as bright as I remembered my x1. I was very disappointed and was starting to wonder if I had two bad lamps as I was pretty sure i should have a brighter image. I could not adjust the brightness, contrast, color temperature, preset (presentation, film, video) to make the picture any better.
My ebay X1A purchase arrived with no lamp so I placed the presumably bad lamp from the 4800 in it and was amazed that it was MUCH brighter than it was in the 4800 but still not as bright as it should be. I then put the "new" lamp from first X1 into the X1A and now have the results I expected, a nice bright clear image that I should get from any of these projectors (expect for the broken color wheel on the X1). I even adjusted the X1a in the same way I did the 4800 to try to answer why the 4800 is so dim with the exact same lamp.
So back to the question, why is this SP 4800 so dim? I know it's not just the lamp now. I used the same VGA cable and source computer for all the testing and was in the same dark room and same screen.
Mar 7, 2010 8:12 PM
I noticed that you are able to supply colorwheels and light tunnels for infocus projectors. I'm in need of a colorwheel and light tunnel for a infocus SP4800. Ball bearing failed in the colorwheel and it is was producing a lot of noise. I've got the project apart and I have tested to the colorwheel to verify that it was the source of the noise, which it was. While I had the project apart, I noticed that the light tunnel had chipped glass.
Do you have a colorwheel and light tunnel available for the Infocuse sp4800 that I can purchase? If so, can you tell me what I need to do to purchase the colorwheel and light tunnel?
May 26, 2008 5:18 PM
I recently purchased a used projector and all in all I am very happy with its performance, BUT I am picky and have noticed one or two scrolling bars that cycle through my seven foot hockey game. These lines are most notably seen when the screen is black or white. I was told it might be a wiring issue, but am not sure of what to do or where to start to correct it. Your expertise and comments are appreciated.
May 22, 2008 8:01 AM
Hi I am looking for a color wheel for the SP4800 and instructions on replacing it. Starting the growling sound several months ago. Are these available?
Jan 25, 2008 7:53 PM
[QUOTE=LuvMy 4805|Dec 20, 2007 5:25:54 AM]
Better late than never I guess. Just came across your post, but found the answer to your question on this websight,
"The factory defaults on RGB gain and offset are all 50. The changes we made to color balance were as follows: red gain, 54; green gain, 48; blue gain, 53; red offset, 52, green offset, 48; blue offset, 50."
That was taken from the 2004 review, I use these settings on my 4805.
Can anyone tell me the service code for the InFocus SP4800 / X1 series? I am looking to calibrate it with my colorimeter, but am having difficulty locating the access code. Many thanks in advance. I can be PM'd at email@example.com
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