you either cooked the micro, or you blew up one or more of the switching fets, and definitely did a number on the capacitors,
now it could just be my eyes, but the fets towards the capacitors look like they have gotten quite hot,
best way to identify the fault would be with a scope, or atleast a multimeter with AC voltage measurement,
you hook it up as per normal, stick the negative of the meter to battery negative and positive to each output looking for which have a difference,
though in my own opinion at $8 a pop short of a learning experience your not going to cut costs by repairing it,