Author Topic: In-line USB C soldering issues {help}  (Read 1001 times)

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Offline Sxander

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  • Posts: 3
In-line USB C soldering issues {help}
« on: Tue, 09 June 2020, 11:22:11 »
Hey there!

Lurkers first post!

I've been working on some custom USB C to USB A cables recently (4 pin USB 2.0 only). Finished my first cable, plugged it in with the excitement of biting into a new flavour of ice cream for the first time and... nothing. I can't for the life of me figure out where I've gone wrong. Perhaps someone here might be able to point me in the right direction.

  • Here's the datasheet for the USB C connector I'm using (wish there weren't so many pins!) I've added some color coordinated lines to help with the confusing presentation of the pin mapping. * 954.pdf
  • Here's my novice soldering work (2 sets of USB C to A cables) :
    • I've checked for shorts using my multimeter and everything checks out.
    • I've also checked continuity from one end to the other end of the wire, as well as from the soldering pads on the USB C PCB to the pins connecting to the plug (so from C4 to A6, C5 to A7, D5 to B4/B9 etc.)

    I'm at a complete loss here as to why the cable won't work! Have I wired something wrong or is there something else I'm missing?

    Appreciate any guidance whatsoever!

« Last Edit: Tue, 09 June 2020, 11:25:04 by Sxander »

Offline dwrowe

  • Posts: 3
Re: In-line USB C soldering issues {help}
« Reply #1 on: Thu, 10 September 2020, 22:08:27 »
Old thread - but in case someone else comes upon this.

Flip your RED (5V) and BLACK (GND) wires on the USB-A port.  I got tripped up on the same wiring diagram that I think you did, even with your correct soldering on the USB-C side.