I disassembled the unit and found that +5V is shorted to ground on the top board. No shorted tantalum caps or obvious failed parts. I am beginning to think it may be power/ground planes are shorted on the four layer board (all boards are four layer)... probably wasted $20 on a DC-DC. It's not going to be easy tracking down the short. Maybe apply a high-current 5V supply and see what gets hot.
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