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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
clean out the projector with canned air to get rid of the dust that could be causing it to overheat. also make sure the fans are spinning. if it still blinks, replace the temp sensor. if it overheats alot, the sensor will wear out from excessive heat.
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