Macbook Pro 2017 - USB-C Monitor not working

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

  1. NielsO macrumors newbie


    Jul 28, 2017
    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

  2. JohnnyGo macrumors 6502a

    Sep 9, 2009
    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


    May 30, 2010
    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


    Jul 28, 2017
    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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