There are several possibilities here, leaving aside the possibility that the power supply MTBF figure was simply exaggerated.The Al Caps used in switching power supplies are rated for 2000hrs or at the max 5000hrs. I saw one switching power supply with MTBF of 100,000 hrs. I wonder what kind of caps are used to get such high life?
by Duane Benson
by Jeff Child
by Aaron Carman