my overhead projector keeps blowing bulbs quickly?

There are several things that will cause bulbs to fail. The most common that I see is the bulbs are not installed all the way in their socket, they just set the bulb on top of the spring loaded socket pins and they will arc and overheat. The next thing is make sure that all air diverters are in place and that fan and screens are dust free. If the bulbs are bounced around like on a cart from classroom to classroom that will cause the bulb to quickly fail. If it fails at turn on there is a rectifier diode that will cause that problem.

William
June 2009

I repair hundreds of these things a year at a school...the most common problem is the diode/rectifier or the fan is so clogged with dust and junk that it doesnt spin. Some simple repair steps would be to take the fan apart, clean it and oil it with light motor oil. If it is the line voltage (you can check with a volt meter), then you can replace the diode/rectifier for around $15...check out mbelectronics.com for original overhead repair parts. They do give a discount if you are a school.

Dan Sperber
April 2009

Hi there! Im Shayne from LCD Presentation Systems Inc. We fix projectors for the lowest prices youll find anywhere gaurenteed. Im not just saying that either. Im on here looking for more business and we fix everything from projectors to tv's, and everything in between. Our tech is one of the best I've ever had the opportunity to work with. He can fix anything. Let me know if you are still interested in your repair request. You can email me @ info@lcdps.com and we can go from there! Id love to be able to help you out!! Have a wonderful day!

Shayne Leatherwood
August 2006

That circuit device is a diode rectifier and it may be defective or has become defective over time.This has happened to me many a time and am going through the process of this at the moment. Regards Alan

alan brimble
April 2006

AV person in a school. Have had same problems with EYB lamps in overheads. Possible causes: 1. building voltage fluctuations 2. fan/cooling slots covered 3. building thermostat turned way down at night, bulb gets cold and if not warm enough will fail at first ignition next morning 4. constant turning on/off. If you use an overhead turn it on and leave it on.

JMcMasters
February 2006