Question about ViewSonic PJ550 Multimedia Projector
The lamp on my projector recently went out. Heard a pop and looked at the lamp and it had a lot of broken glass inside the bulb itself. Got a replacement lamp installed and it will not light. The projector power LED blinks green for a minute or so and then cooling fan(s) sound like the speed up slightly. After this the the lamp LED blinks red and the power LED turns solid red. I checked the voltage going to the lamp during this and never got anything. I pulled the lamp and checked with an ohm meter and it showed as being open. Does this sound like a bad replacement lamp or something with the projector?
Problem 1) The projector should put out a burst of 7000-15000 volts to start the lamp, and then immediately drop down to 60-100 vlts to keep the lamp lit. It sounds like the bulb blowing took out your ballast, or the ballast going out took the bulb (uncontrolled current = overheated bulb = boom)
Problem 2) Thats not a problem at all. HID lighting uses an arc to create light, just like welding creates light. Since it uses an arc, and not the heating of metal, there is no filament to test the resistance of. All the bulb is, is a special mixture of gasses and two very durable electrodes, with a gap in between.
Posted on Dec 02, 2009
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Posted on Jan 02, 2017
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