LG UltraFine 4K display randomly flickering
June 29, 2026
June 29, 2026
I have a LG UltraFine 4K monitor (24MD4KLB-B, the one made in partnership with Apple in 2019 for deep macOS integration).
This year it randomly started flickering. Literally once second it was OK, and the next it was flickering. It’s been plugged the same way for years (I use it with a Lightning cable on my MacBook, which also powers the laptop). Nothing changed.
Tried a bunch of things including unplugging and re-plugging the display, both from the laptop and from the power outlet, as well as restarting the computer. No change.
Flickers varies from the whole screen flashing black at a fast rate, or some specific portions of the screen flashing with more of a “noise” pattern? And more recently, ghosting of what I had on screen at the time it started flickering.
The only report I found is this Reddit post but sadly no solution there (until I posted mine more recently).
The only thing that seems to reliably fix this for me is to plug the laptop with a power adapter, instead of relying on the screen to power and charge it.
It’s not instant but it seems after leaving the computer plugged for a few minutes or sometimes a few hours, the flickering is gone.
Then you can use the screen for power again, and in my experience it’s fine again for weeks or even months until the next instance of flickering. 🤷