The usb connector on my PB psu has gotten mangled. Normally I wouldn't matter about such trivial things, but the psu that came in the PB box, the one with the yellow tip, was probably the best charger known to man for any micro usb device, phones, tablets, you name it.
So I've got a replacement connector and I'll be repairing the cable tomorrow but I can't tell by just looking at the wires which is the live and which is ground. Is there any way to tell other than cutting the broken connector open with a hot scalpel?