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hi, All electronic equipments have fuse in the power supply section. In your projector it is inside the unit. The fuse of projectors will blows only if there is any trouble in the power supply. Just try to replace the fuse in the power supply board. It will be near the input connector. If the fuse again blews then you have to replace the power supply board. Because the components in a projector power supply is rearly available. You will not be able to access the fuse with out oppening the projector. OK
either the lamp has/is going to expire, or the ballast is bad. if the lamp has bulges or black spots on the inside, replace the lamp and clean out your projector with canned air. too much dust keeps in the heat and makes a 2000 hour lamp go in 1100 hours.
Hello BobSmalley, From your post, I gather that you know your way around electronics. So, why don't you use a VOM (Volt Ohm Meter) to trace power starting at the PS and see where you lose it. You may find a blown fuse along the way as you didn't mention fuse status (and that projector surely has one). If you do have access to a meter you could also check the ballast to see if it's putting out enough voltage for the lamp. But since you stat that it doesn't power up at all, I would lean towards the Power Supply (PS) and locating the fuse (could be an AGC, etc... or a printed circuit fuse soldered in circuit right on the component side of the board near the edge where power comes in). Keep us posted, and Good Luck.
You can test the power source if you are getting any power input from the power cord itself. Plug in your power cord and use an eletronic meter on the other end to see if you are getting the proper voltage (110/120) reading. If not, then the power cable is bad in itself. IF you are getting power from your cord, it could also be a fuse inside the Optoma and/or where the power plug on the Optoma meets the actual power source is out of alignment or may also be not making the proper contact to the main circuit board on the Optoma. Hope it helps....JGUAM