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geekhack Community => Keyboards => Topic started by: Sxander on Tue, 09 June 2020, 11:22:11

Title: In-line USB C soldering issues {help}
Post by: Sxander 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. [attachmini=1]
  
• 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.)
    [attach=2][attach=3][attach=4][attach=5][attach=6][attach=7]
    
  
  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!
  
  Cheers,
  

Title: Re: In-line USB C soldering issues {help}
Post by: dwrowe 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.