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This projector as with most high power projectors will have a cool down period for the lamp once the power button is pushed from on to off. For this model, the cool down period is 120 seconds after which the unit will fully power down. You can override this cool down period by pushing and holding the power button for 1 seconds. If you use this procedure though, you should not power up the projector again for at least 60 seconds to allow the internal temperatures to stabilize.
The capacitors on the power supply need to be replaced. When you take apart the projector, and then remove the power supply (it's the section that the power cord goes to) and open it up. Look for the little can capacitors and see if any of them are bulging on top. That is the sign that they've blown. Replace the big ones (about 5) for about $5 in parts. Reassemble and test by turning it on. Search for YouTube video for this.
Your projector need replacement of lamp unit if you don't want yet you just reset the lamp counter
Power on projector
press MENU key
Press right arrow key to select Option
Press down arrow key to select lamp Hours
Press and hold down the ENTER key 5 second (lamp hour counter show red)
press POWER button to turns off the projector
now you power on your projector and no error displaed and no itself turn off after 15 minutes
The projector was in security mode B which lock all of the projectors controls. I found the solution to this problem in an online manual for the projector. The solution is this button sequence: power-- enter-- power--enter-- power--- enter-- menu. This sequence unlocks the projector controls by resetting the security password.