I had the same problem and fixed it today. The fan is 70 x 70 x 20mm. I could not find the exact one, but 70 x 70 x 15 works just fine and I was able to find that fan at a Micro Center store for $8.99. The fans should be blowing air out from the front of the machine, not blowing in on the lamp.
This is a common problem with these projectors. There are actually 3 fans in the unit, 2 of which commonly fail. If you replace the fan with another one not exactly like it the unit will still shut down after a few minutes with a fan fail error. (blinking temperature light) I may be interested in purchasing your dead projector. Please email me at nalexandrov251 (aT)gmail.com and we might be able to work something out.
We have several of these projectors and this is a common problem. The cooling fan that directly cools the bulb dies. Since the warraty is expired on them we have gone through hell and back to get them fixed. We found a company that will fix them but no one will sell us the parts.
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Lamp is burned out or makes a popping sound. When the lamp reaches its end of life, it may burn out and may make a loud popping sound. If this occurs, the projector does not turn back on. To replace the lamp, see on page 38. LAMP light is solid amber If the LAMP light is solid amber, replace the lamp. LAMP light is blinking amber If the LAMP light and the Power light are blinking amber, the lamp driver has failed and the projector will automatically shut down. If the LAMP light is blinking amber and Power light is solid blue, the color wheel has failed and the projector will automatically shut down. Unplug the power cord after 3minutes then turn the display on again. If this problem persists, contact Dell™. TEMP light is solid amber The projector has overheated. The display automatically shuts down. Turn the display on again after the projector cools down. If the problem persists, contact Dell™. TEMP light is blinking amber A projector fan has failed and the projector will automatically shut down. If the problem persists, contact Dell™.
If you are connecting to a laptop then you may need to hold the function button down and press F1, F2, F3 etc. there should be a sign with the latop on there and a sign with an external device (monitor,PROJECOR)
hope this information was useful to you.