Sounds like it's missing the ground connection on the 12V. Check the socket soldering and continuity with the board.
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On Aug 22, 2023, at 16:07, Bruce KS4V <
Ks4v@...> wrote:
I am helping a friend troubleshoot a QMX wired for 12 volts.? The rig will not power up unless the USB c cable is attached.? Remove the USB cable and the rig will not power up.? Thinking about reflowing the pins for the USB connector but does anyone have a better suggestion?
