Usually 750 to 5,000hours depending on the bulb
replace bulb
Replace the lamp, Whenever the lamp/bulb is going out there is an auto shut-off that kicks off the internal electronics, it is a heat issue that occurs whenever the bulb is shot.
also there is a safety switch which should be on the side of the TV (if you are looking at the front it should be on the left side near the back)
inside this panel is the switch
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