Macbook Pro 2017 - USB-C Monitor not working

Discussion in 'MacBook Pro' started by NielsO, Aug 8, 2017.

  1. NielsO macrumors newbie

    NielsO

    Joined:
    Jul 28, 2017
    #1
    Hi Guys,

    My Macbook Pro from 2017 does not recognize the new LG 43UD79-B. I connected the display with a new Caldigit Thunderbolt 3 cable. My macbook does recognize that there is a display connected some how. But in system information I can only see that my MB is powered with only 7 watts.... Normally the display would power 60watts.

    I can't find the solution and it would be great if you guys could help me out.

    I will add a couple of screen shots so you can see what my MB does.

    Schermafbeelding 2017-08-08 om 12.32.02.png Schermafbeelding 2017-08-08 om 12.33.01.png Schermafbeelding 2017-08-08 om 12.34.09.png

    Thanks!
     
  2. JohnnyGo macrumors 6502a

    Joined:
    Sep 9, 2009
    #2
    It seems to me that the issue is with your Thunderbolt dock. Most docks do not charge at 60-87 watts (MBP 13-15”) but rather at 30-45 watts.

    But your info regarding charging with 6-7 watts may be a “net charge”, meaning the TB3 dock my be charging at 15-30watts and your Macbook is using 10-20watts.
     
  3. Brookzy macrumors 601

    Brookzy

    Joined:
    May 30, 2010
    Location:
    UK
    #3
    It’s probably the cable.

    Thunderbolt 3 cables longer than 0.5 metres do not have full USB compatibility.

    Try the cable that came with the display or another 5 or 10 Gbps USB-C cable (not the 480 Mbps charging cable that came with your MacBook).
     
  4. NielsO thread starter macrumors newbie

    NielsO

    Joined:
    Jul 28, 2017
    #4
    Could it be that the cable must support USB 3.1/3.0 backwards compatibility? Could this solve the problem?
    I am willing to send the cable back and buy a new one. But if I would buy a new one I have to be sure that it will work.
     

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