Depending on the age of the projector it is likely the power supply. If the first 4 letters of the s/n are ANEL or anything other than ANEV it could be that the power supply is an older model that did'nt get the upgrade that was used to fix the premature shutdown issue which was fixed by soldering a ground wire from a point on the bottom of the power supply to the top of the main board. If you take the top off you can see if a wire coming from the bottom of the power supply to the top of the main board and it should be soldered and not screwed in by a screw.
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Depending on the age of the projector it is likely the power supply. If the first 4 letters of the s/n are ANEL or anything other than ANEV it could be that the power supply is an older model that did'nt get the upgrade that was used to fix the premature shutdown issue which was fixed by soldering a ground wire from a point on the bottom of the power supply to the top of the main board. If you take the top off you can see if a wire coming from the bottom of the power supply to the top of the main board and it should be soldered and not screwed in by a screw.