Question about InFocus ScreenPlay 4805 Multimedia Projector

3 Answers

Fan does not operate

After cleaning the bulb screens and re-inserting the bulb housing on my SP4805, the fan that cools the bulb does not run and the projector gets very hot. Also, it makes some occasional whirring sounds. The projector operates normally with a solid green LED. Any ideas?

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  • Doc E Jan 06, 2008

    As it turns out, the fan does seem to be obstructed. The fan blade rubs against the plastic surrounding it which prevents it from turning. Not sure how that happened. Seems like I need to get inside it to fix it, but had a little trouble figuring out how to open the machine. Any guidance on how to open the 4805?? Thanks!

  • Doc E Jan 09, 2008

    Thanks for the great instructions for taking the cover off! I managed to get the projector open and apart without much trouble at all. I managed to get the fan out of the projector and it seems to me that it needs to be replaced. Having trouble finding a Nidec BETA SL model #D08G-12TS4 fan online for replacement. Anyone know where to get one or a compatible replacement? Thanks again.

  • Doc E Jan 15, 2008

    Well, found a replacement fan and installed it. However, after putting everything back together, the new fan does not operate either. Does this definitely indicate a problem with the board?? What are my options now?

  • Ken L Jan 23, 2008

    I am having the exact same problem with the same Nidec Fan.

    Doc E, where did you find a 12 Volt fan that will fit in this system? I have found 12V fans but nothing that will fit. If/when I find a fan and still have the same problem I was thinking of hard wiring something externaly to see if the issue is the fan, the fan electrical port, or the board.

    I took my projector into a repair shop and they charged me $100 to tell me the fan was broken which I already knew. They stated that they could not fix it either.



3 Answers

Glad to have been of help with the instructions. Don't bother of getting the exact replica of the fan just get the right size that fits they are usually all 12volts and shouldn't be a problem to find.

Posted on Jan 09, 2008


Turn the projector on it's back unscrew the 4 screws that are on the front and back grill. Unscrew the 4 screws that hold the bottom case. remove the 3 small screws from the back grill. Remove the focus and zoom rings. The zoom ring can be stubborn to remove. What I do is lever it off by pulling the front grill. Don't try to remove the front and back grill from the top case. It's better to remove them together. When you succeed in removing the zoom ring, lift the the front grill together with the top case up. You should be able to insert your hand to push off the keypad and speaker plugs. When you're reassembling back the covers, separate them by gently prising the front and back grill from the top cover with a flat blade screw driver from the inside. Assemble the top cover first and not forgetting to plug in the keypad and speaker plugs at the back.

Posted on Jan 06, 2008


Make sure that nothing is obstructing the fan. Try to rotate the fan with your fingers to make sure it is free. If it is, you would be lucky if the fan is at fault because this is rather cheap and easy to find if not it is the main board which is at fault.

Posted on Dec 31, 2007

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Posted on Jan 02, 2017

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When the bulb heats up & cools in normal use, the housing will contract and become loose.

Unplug and re-seat the bulb and housing ...

Another possibility: If the replaced bulb shattered in the projector, there may be debris in the fan... use compressed air ($8/can RadioShack) to clean out (make sure the projector / bulb are cool before using compressed air.

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