Macbook pro m1 chip not connecting to LG monitor via usb-c

Question

Macbook pro m1 chip not connecting to LG monitor via usb-c

My Macbook m1 is able to connect through HDMI to my 4k LG monitor but not through USB-C.

It keeps turning on and off (the screen), showing up shortly in my display settings and disappearing again.

What I've tried;

buying different kind of usb-c cables even the €80 from Apple
Switching on and off the screen, even getting it off power completely
Resetting the screen
Starting my mac in safe mode
Removing all log-in items from Macbook
Changing Herz for external screen
Tried all of the usb-c ports on my mac
Calling with apple support (told me mac was fine call LG)
Calling with LG support (told me screen was fine call apple)
Tried switching the screen on with macbook plugged in, and without

Works fine with my partners Macbook (Air m1 2020 and Air m3 2024)

I am getting desperate .. dont know what else to do ?

MacBook Pro 16″, macOS 14.6

Posted on Sep 9, 2024 9:10 AM

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Answer 1

Sep 9, 2024 9:33 AM in response to santifromamsterdam

I don't know what ports your LG monitor has – but if it has multiple USB-C ports, make sure that you are using the right one.

There is one Dell monitor, for example, that has three USB-C ports:

Video + Data
Upstream - for connecting hub ports to a computer if you're using the DisplayPort or HDMI inputs
Downstream - for accessories

Presumably only the first one would accept video from a computer.

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Answer 2

Sep 9, 2024 1:20 PM in response to santifromamsterdam

santifromamsterdam wrote:

LG 32UP55NP-W

https://www.clove-technology.com/products/lg-32up55np-w-computer-monitor-80-cm-31-5-3840-x-2160-pixels-4k-ultra-hd-white

https://www.lg.com/nl/monitoren/ultrafine-uhd-4k-5k-monitoren/32up55np-w/?sortCriteria=%40ec_pdp_view_count+descending&srsltid=AfmBOopIBEj0GKIg6_nFBtZrPMvAekF4z4yuFUDvSWD5nuXno0-Uzzu5

31.5", 3840x2160 pixel monitor, refresh rate of 60 Hz. Appears to have DisplayPort, HDMI, and USB-C ports. The LG site is in mostly in Dutch, but run through an automated translator, it says

"USB Type-C™ ports enable 4K display, data transfer, and charging of connected devices (up to 90W) all simultaneously through a single cable."

There is nothing at all unusual about the resolution or refresh rate of this monitor, so my first suspicion would fall upon the USB-C cable. Current versions of macOS are supposedly very picky about transmission errors, as in not wanting to see any, and deliberately cutting resolution or cutting off the display if errors are detected. But you say you've tried all sorts of cables – including the Apple one (which, if it is the Thunderbolt 4 one, should be overkill in terms what's needed to support this monitor.)

I'm not sure what to tell you.

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Answer 3

Sep 12, 2024 9:18 AM in response to santifromamsterdam

USB-C cables for this purpose need to be no longer than ONE meter.

They must be genuine certified USB-C cables carrying USB-C identifying marks, indicating they are capable of at least SuperSpeed Plus 10 G bits/sec speeds (the inbound data paths will be 'turned around' on the fly to obtain the required 20 G bits/sec speeds).

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Answer 4

Sep 9, 2024 11:21 PM in response to Servant of Cats

Thanks for investigating though! Appreciated. I am also unsure what it could be ..

I've also reset the LG screen back to factory settings multiple times.. maybe someone else knows something. I ll keep trying and googling stuff. If I find something Ill be sure to update this thread.

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Answer 5

Sep 12, 2024 4:57 AM in response to santifromamsterdam

Update -> when I buy a new usb-c cable ( i keep trying) it sometimes works for a day and then starts doing the same thing again .. this is so weird. who would've thought a €3000 macbook and a €400 screen would not work for you ...

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Answer 6

Sep 12, 2024 9:38 AM in response to Grant Bennet-Alder

mine is 0.7 m currently. I also tried with the official apple one but that didnt work either.

the current one i am trying with is:

USB 4 Gen 3x2

more info here:

but i tried it with all - it works for a day or two but then stops working. my partner has macbook air m1 and macbook air m3 and both work fine with the screen and the cable so it seems to be my mac.

i also tried hooking it up to a apple studio screen, that worked fine but i am still willing to believe that i can work with a screen thats less than €1500 >.<

[Edited by Moderator]

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Answer 7

Sep 12, 2024 10:20 AM in response to Grant Bennet-Alder

cable is 0.7 m, Version USB 4 Gen 3x2

this is what it says on the site where i bought it

The USB-C™ data cable is used for ultrasonic overdrafts that are ideal for music, video's, films of TV-series in maximum 4K @ 60 Hz. It is ideal for gamers, films and home entertainment.

USB cable with USB 4.0 for super synchronization at 20 Gbit/s - 4 channels in USB 3.0 can be used for USB-C™ devices for laptops and smartphones with maximum 240 W and 48 V at 5 A power Delivery 3.1 (EPR) Supports high resolutions up to 4K @ 60 Hz on a TV monitor Compatible with Thunderbolt™ 3 and Thunderbolt™ 4 with compatible USB 3.2, 3.1, 3.0 and 2.0 Support for DisplayPort and PCI Express (PCIe) protocols USB-C™-naar-USB-C™-kabel is USB-IF-gecertificeerd

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Answer 8

Sep 9, 2024 9:37 AM in response to Servant of Cats

It only has one usb-c port unfortunately (i guess ;))

LG 32UP55NP-W

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Macbook pro m1 chip not connecting to LG monitor via usb-c

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