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Regarding realestate of the caps on circuit boards, most manufacturers have reduced the size of the can over recent years and/or offer a taller profile (same diameter) and at the next higher voltage range (say what was 16V and now is 25V) to give you some more margin. This is why many use the very good parametric search engine features like Mouser and DigiKey have when shopping for components. As others have said, a failed 47uF 16V 85deg-C high frequency switching power supply cap in a 15V circuit is a very poor margin. To me it should be a low ESR, 25V 125 deg-C pro-active replacement type; maybe also upping the capacitance to 63 or even 100uF to get the ESR even lower.
Tom (PK)
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