Connect LG 29UM69G-B monitor to MacBook Pro 2017 via USB-C

I got a LG 29UM69G-B monitor today and I would like to connect it via USB-C to my MBP 2017. I've used the USB-C charging cable that came with my MBP but when I connect it to my MBP the display is not recognized at all. However, the MBP does charge via USB-C, it just doesn't doesn't detect the new display (i.e. Displays ➔ Arrangement doesn't show any additional display).


Does anybody else have issues with USB-C monitors? Do I need a special USB-C cable for this use case? The display works via HDMI and USB-C / HDMI adapter.

MacBook Pro TouchBar and Touch ID, macOS High Sierra (10.13.3), LG 29UM69G-B

Posted on Feb 19, 2018 7:45 PM

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Posted on Mar 26, 2018 6:58 AM

USB-type-C should be thought of as an Attribute of a cable that specifies its cable-ends. It does NOT adequately describe its function. The best worst counter-example is the MacBook Charge cable. It has USB-C on each end, but is only capable of Charging and USB-2. Nothing more.


The ports on the most recent MacBooks are capable of many different protocols, including ThunderBolt-3, USB 3.1, and charging at multiple Voltages. Some displays may be able to interface with either or both of those, but in general ThunderBolt-3 is only good for genuine ThunderBolt devices, and a Charging cable often does nothing more.


That first Belkin cable picture shown by pavitchat is of a cable sold as a USB 3.1 cable (the green dot at the top) which features USB-C connectors as an attribute. (shown among features at the bottom.)


What has never worked is "stacking" converters. You generally must perform the complete conversion in ONE converter, with a few minor exceptions for re-wire adapters, such as [Mini] DisplayPort to [Full size] DisplayPort.


The "good old days" of "if the plug fits, the devices will work fine" are gone forever.

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Question marked as Top-ranking reply

Mar 26, 2018 6:58 AM in response to filebot

USB-type-C should be thought of as an Attribute of a cable that specifies its cable-ends. It does NOT adequately describe its function. The best worst counter-example is the MacBook Charge cable. It has USB-C on each end, but is only capable of Charging and USB-2. Nothing more.


The ports on the most recent MacBooks are capable of many different protocols, including ThunderBolt-3, USB 3.1, and charging at multiple Voltages. Some displays may be able to interface with either or both of those, but in general ThunderBolt-3 is only good for genuine ThunderBolt devices, and a Charging cable often does nothing more.


That first Belkin cable picture shown by pavitchat is of a cable sold as a USB 3.1 cable (the green dot at the top) which features USB-C connectors as an attribute. (shown among features at the bottom.)


What has never worked is "stacking" converters. You generally must perform the complete conversion in ONE converter, with a few minor exceptions for re-wire adapters, such as [Mini] DisplayPort to [Full size] DisplayPort.


The "good old days" of "if the plug fits, the devices will work fine" are gone forever.

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Connect LG 29UM69G-B monitor to MacBook Pro 2017 via USB-C

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