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LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

Hi there. I just bought the LG 32ud99-w for my brand new 15" MBP 2018.

LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

Posted on 2019-01-16 17:49:14 4K / 5K Monitors Vote Up0Vote Down

Hi there.

I just bought the LG 32ud99-w for my brand new 15" MBP 2018. I connected the display with the supplied USB-C cable and it recognized the display as it should do. No problem there. After like... 10 min. the connection was lost to the display (Black display and a charging sound from the MBP), and after one or two seconds the connection was back again. That has been like that, back and forth, since I bought it yesterday! Please help! (My MBP has a fresh Mac OS installed. Latest version). Should I deliver the display back? https://vimeo.com/311717355

12 Comments

  • Reply Title Icon

    RE: LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

    JamalofLGJamalofLG LG Moderator
    Posted on 2019-04-16 18:55:34 Vote Up-5Vote Down
    madmousedk, do you still require assistance with this?
    robrobro

    Did this resolve your problem? Let everyone know by selecting "Helpful"!

  • Reply Title Icon

    RE: LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

    guiphguiph Member
    Posted on 2019-07-12 19:45:03 Vote Up0Vote Down
    I have the exact same problem here. Any suggestion ?
  • Reply Title Icon

    RE: LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

    JamalofLGJamalofLG LG Moderator
    Posted on 2019-07-15 14:39:24 Vote Up-5Vote Down
    guiph, do you have the same setup?
    robrobro

    Did this resolve your problem? Let everyone know by selecting "Helpful"!

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    RE: LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

    robrobrorobrobro Member
    Posted on 2019-08-30 11:57:41 edited August 2019 Vote Up0Vote Down
    I have a 2016 Macbook Pro and have the exact same problem. Tested with a 2018 Macbook and a different cable, but still no luck.

    I have tried to find something relevant in the console, and this looks interesting to me:

    [ERROR] - Driver bug - rowBytes too small. Display 0x1b5d6c75, ioModeID 0x80007020, ioModeDepth 0x1, bytePerRow = 32, width = 1, bitsPerPixel = 32, minRowBytes = 26880 stored width = 6720. Forcing minRowBytes (possibly still wrong).


  • Reply Title Icon

    RE: LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

    redsupredsup Member
    Posted on 2019-09-20 09:12:33 Vote Up0Vote Down
    I'm facing the same issues with connecting over USB-C to my my MBP 2018. Also with the included HDMI Cable it only delivers a resolution of 1920x1080. With loosing the connection over usb-c the monitor becomes quite useless. Is there any firmware update possible or different cables that might work better? Anything? Help is much appreciated. 
  • Reply Title Icon

    RE: LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

    MagnusTMagnusT Member
    Posted on 2019-10-14 18:01:02 Vote Up0Vote Down
    I'm having the exact same issue. I bought a LG 32UD99-W yesterday, connect it with the supplied USB-C cable to my MacBook Pro (15-inch, 2017). The screen blacks out randomly with a couple of minutes in between. I have only my Mac connected to the monitor. I have tested with both Mac OS 10.14 and 10.15.

    I see now that LG hasn't replied since April. Did anyone get this resolved?
  • Reply Title Icon

    RE: LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

    niwredniwred Member
    Posted on 2019-12-02 22:45:12 Vote Up0Vote Down
    I seem to have a similar Problem where my MacBook (MacBook Pro 13-inch 2019) sometimes no longer re-connects to the screen after sleep.
  • Reply Title Icon

    RE: LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

    GuillaumeBGuillaumeB Member
    Posted on 2019-12-18 07:18:04 Vote Up0Vote Down
    Hi

    Same here with a band new MacBook Pro 2019. How resolve this issue very annoying, please ?
  • Reply Title Icon

    RE: LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

    GuillaumeBGuillaumeB Member
    Posted on 2019-12-23 10:26:35 Vote Up0Vote Down
    Could LG do something ?
  • Reply Title Icon

    RE: LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

    FloppeditFloppedit Member
    Posted on 2020-01-06 11:04:57 Vote Up0Vote Down
    Hi guys,

    Did we ever get an update? My LG monitor also doesnt seem to want to connect to LG but has no issue connecting to other monitors. My monitor also has no issue connecting to other computers.

    Thanks
  • Reply Title Icon

    RE: LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

    GuillaumeBGuillaumeB Member
    Posted on 2020-01-15 09:07:27 Vote Up0Vote Down
    Could be USB-C power issue because it seems that my MBP to LG fails want power consumption is high.

    Didi LG read this forum ?
  • Reply Title Icon

    RE: LG 32UD99-W connection problem to Macbook Pro 2018 w/ USB-C.

    guiphguiph Member
    Posted on 2020-01-19 16:30:07 Vote Up0Vote Down
    The only solution I found is to plug the power cable to my MacBook Pro. It doesn't take the power from the LG. So what's the point. ?
    Any Help LG ???
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