Zu Tantalkondensatoren/Fehlerbild:

Tantalums tend to fail at turn-on. They almost always fail as a short circuit. Combined with the fact that tantalums are usually used for power supply bypassing, this means that if a product fails at turn-on with symptoms that a power supply is down, a tantalum cap is a prime suspect.
Mark Rumreich, The Electronics Repair Cookbook, S. 112

Ich denke, die Spur ist heiß