Back in the days of the Athlon socket A era, a lot of mainboards from mostly all brands suffered of failing electrolytic capacitors. There after the quality of the components becomes better and the problems were gone. But there are still some newer mainboards on the market, that have explosive capacitors on-board.
One example comes from ASUS, the ASUS M3A, a mainboard with AMD 770 chipset and socket AM2+.
The board was running around 15 months with an AMD Phenom 9500, all voltage and frequency settings at automatic, until I noticed the blown up electrolytic capacitors.
All of the four primary side capacitors of the processor voltage regulator module have failed. And they double failed. Instead of blowing at the top, as they were designed to do at too high pressures, they blow out at the bottom.
Fortunately no other components were affected due the fails and the mainboard is still working, but it freezes immediately on heavy cpu load.

The primary VRM electrolytic capacitors are all blown up!

Top view of the ASUS M3A mainboard

The mainboard was manufactored in late 2007. I purchased it in late 08.