Listen to hear if lamp fan is working while lamp is on.also pull out bulb an housing and spray air in fan ,make sure the edges are clean,.there is another fan on the dlp chip
Make sure all Airways do not have alot of dust builted up blocking Airways this can cause Lamps to Blow, also keep in mind these sets are only desinged to play between 5000 to 8000 hrs you cannot leave them on day and night like regular TVs,and yes New Lamp does not mean that it was not Defective sometimes companys do have a run as to where they have alot of defective Lamps it Happens
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