Hi Martin,
Wow... sorry to hear that this shonky cable fried the board in your new mount!
Cable looks good as far as the wiring goes, at least with respect to their pin assignments. They haven't been reversed. Without seeing what the white and black wires were like prior to the meltdown, I would be inclined to say that the problem is not the wiring itself but the core logic which is embedded in the USB plug at the other end of the cable (see attached image).
I hope you're not left waiting too long for replacement equipment.
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