Please, refer to the following link:
https://www.optomausa.com/support Optoma Support
A trained service technician may be needed to repair the faulty component.
SOURCE: Unit turns on for 20-30 seconds then powers off.....Please Help
it is the ballast issue,u can try one of the equivalent ones or just try & rework on the old one, perhaps one of the mosfets is leaky!!!!!!!!
SOURCE: How can I check the used hours of the lamp?
press buttons up-up-left to go into service mode, there you see the lamp hours, succes
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SOURCE: ive had my optoma ep721 projector probably for likle 2 months and
1 of 2 things happened here. Either the power supply is spent or your lamp ballast is busted. In either case it would have to be opened and repaired professionally. may cost upwards of a new projector, so look around for a decent shop and have them test it. If you dont mind me asking, if you decide to get rid of it would you mind selling me the lamp cheaply. Doesnt matter if its burn out, just need the glass from the bulb if its not broken. Hope i helped.
SOURCE: projector turns on the power light flashing and lamp light solid
Here's the fix: Take off the top cover of the projector. Unplug the
wire leading from the two fans in the back of the unit to one of the
circuit boards in front of you. Just trace one wire from fan to board.
Unplug at board. Turn unit on and it will again turn on, show HP splash
screen and then shut down, like it should, because the fans are now
disabled. After it completly shuts down, plug the fan wire back into
the board. Turn the unit back on and, presto, its working again. It
will not turn off.
Try it!
SOURCE: no display from projector
try resetting the lamp timer. if that doesn't work: listen for a high pitched whir when you power it on. if you don't hear it, the colorwheel needs replacing. if you do hear it and it doesn't light, the ballast is bad and needs replacing.
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