I have LG Ultrafine 22MD4KA-B monitor that I am trying to use with my MacBook Pro.

MacBook Pro is Core i9" 2.4 16" 2019 5600M

https://everymac.com/systems/apple/macbo...

At first the problem was that only in MacOS (various versions) monitor blnks like crazy. On the same machine i have BootCamp with Windows 11 and from there monitor works normaly. When i boot in MacOS it automaticly starts to blink and it then continue to blink even if i boot to Windows. Only way to stop that is to disconect monitor from power and wait couple of hours (usualy one night). Then it works normaly again but only in windows not the MacOS.

As i can recal i tried using LG application for this monitor in windows, and when i changed brightness it started with blinking. Again as i recall. At that time I did not used MacOS with this monitor so mabey the problem was already there, and then mabey it started with me and that LG app.

I tried couple of things like disabling auto brightnes, graphic switchnig, and so, but with no success. Also a lot of different USB-C and Thunderbolt cables (this model only have USB-C connection)

Also worth mentioning is that in Internet recovery and as i recall in safe mode it does not fliker (after one night without power).

As I mentioned in another post, it seamed that at some point monitor fixed it self (in windows and macos) but that did not lasted long.

I used monitor like that for a while, but now it started blinking in Windows also, and leting it without power is not working same as before. It continues to bilnk no mater what. Now i left it without power, and will leave it for a few day to see what will happen.

I asume that it is some hardware issue but not sure. I do not have multiple Macbooks to try them. If someome have some suggestion or hint it would be much appreciated. I love this exact model because of screen size and resolution...

I have a question about a 24” LG Ultrafine 5K Monitor. The screen shows a picture, but it is equally greenish tinted, see attached photo.

I tried 2 different MacBooks and different cables. Also the screen has 2x usb-C input and it doesn’t make a difference which one I’m using.

I assume it’s a hardware defect on the mainboard, the question is if the defect allows to narrow down, where to search on the mainboard.

Do you have an idea what could possibly be the problem?

Thanks!

⟐ Commented maio 25, 2025 at 5:31 GMT-7

⟐ Answered abril 28, 2025 at 5:07 GMT-7

⟐ Commented março 23, 2025 at 15:48 GMT-7

⟐ Answered dezembro 06, 2024 at 12:56 GMT-7

https://www.youtube.com/watch?v=JY_OdRQs...

Would this be related to the Texas Instruments LP8860AQ1 LED Driver as shown in the ifixit page here: LG UltraFine 5K Teardown Or Is it likely to be something else?

This is a replacement motherboard from a second hand unit. The thunderbolt port on mine died hence why I replaced the motherboard. Something I have noticed with this new MB is that when you power it on the right hand side of the screen (exactly the area as shown in the video) flashes white - yet my original MB did not do that, hence I am convinced it is the motherboard (the same thing happens with the MB in the original unit (but the screen on that is cracked)).

The only other thing I can think of is it could be the connector for the backlight?

⟐ Commented março 31, 2024 at 22:43 GMT-7

⟐ Commented janeiro 04, 2023 at 9:54 GMT-7

⟐ Answered novembro 15, 2022 at 12:49 GMT-7