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if the led flashes once in 2-second intervals and you don't hear a high-pitched whir, the colorwheel needs replacing. if you do, the ballast is bad. if it flashes 2 times, the lamp is past 3000 hours. 4 times, fan error. 5 times, temp too high and it needs to cool.
If not , open up the lamp door at the bottom and take out the lamp. Check on the lamp's shaft for any irregularity ( i.e. vein like looking black marks or bubbles or a white spot , also check that the fillament on the inside is not broken.)
If you spot anything I listed up here , your lamp will need replacement.
If you cannot see any irregularity , check when the unit shuts down which of the LED's on the unit flashes.
It will either be your lamp or the Ballast ( lamp's powersupply ) that is faulty and will need replacement.