One of 4 USB-C ports not working

Discussion in 'MacBook Pro' started by CAWjr, Jun 19, 2017.

  1. CAWjr macrumors 6502

    CAWjr

    Joined:
    Jan 19, 2010
    Location:
    Atlanta, GA
    #1
    I have a refurbished 15" MPB with touchbar that I got in April. I have only been using it as a laptop until this weekend when my wife Brough home two Acer 27" monitors from work. I bought two USB-C to DVI cables to plug the monitors in & they work like a champ. I the plugged in power into the front left USB-C port & it would cut in & out. I moved it to the back port & it worked fine. I then tried to plug in my USB hub to the same port & it would not work.

    With nothing else plugged in, that port has worked fine for power, USB sticks, etc. But it seems that when I have two monitors plugged in the right side ports and power in the back left port, the front left port goes to crap. As a test case, I just unplugged the power, left the monitors plugged in on the right side, and the lower left port still appears to be dead.

    I know that the easy answer is to bring it to the Apple Store to have them look at it, but before I do that, I wanted to see if anyone else has had issues with the ports not working when you have other things plugged into all of them.
     
  2. New_Mac_Smell macrumors 65816

    New_Mac_Smell

    Joined:
    Oct 17, 2016
    Location:
    UK / China
    #2
    Does it work if you plug a single monitor on each side as opposed to two on one? I believe they user separate controllers, one for each side, so that could be the issue. Worth trying before faffing around with Apple support.
     
  3. CAWjr thread starter macrumors 6502

    CAWjr

    Joined:
    Jan 19, 2010
    Location:
    Atlanta, GA
    #3
    I currently have both monitors plugged in on the right side ports & they work fine. Plugging a monitor into the "dead port" doesn't work.

    I unplugged everything & just plugged the power in the "dead port" and now it's acting up with nothing else plugged in. A trip to the Apple Store is definitely in my future.
     
  4. New_Mac_Smell macrumors 65816

    New_Mac_Smell

    Joined:
    Oct 17, 2016
    Location:
    UK / China
    #4
    Does it do this after a fresh restart (It's more likely a H/W issue but worth seeing if it's S/W).

    And you haven't plugged in any 3rd party chargers or cheap eBay stuff into that port? I have heard of a few being DOA but not many failing like that. If you have plugged in something like a cheap power bank into that port then I wouldn't tell Apple...
     
  5. CAWjr thread starter macrumors 6502

    CAWjr

    Joined:
    Jan 19, 2010
    Location:
    Atlanta, GA
    #5
    I just got off the phone with Apple & they had me troubleshoot it a few different ways that included rebooting. The port is DOA.

    As for third party things, I use Aukey USB-C to USB-A adapters, but those work fine. The two USB-C to DVI cables I'm using for the monitors came from Amazon and they work fine on the non DOA ports. I've only used the included Apple power pack, so I'm not concerned about any of my accessories having fried the port. Good advice to avoid telling them if I had though. :)
     

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