External Displays won't come back on

Tried this solution and if anything the monitor has got worse with the power cord plugged in, this has been going on now for 4 months. Do we know if it just the 4K 5K LG monitors which are the problem with these MacBook Pro 16? Get a little fed up dealing with this problem, I would not mind so mush if there was a solution, but there is no fix as far as I can see, apart from buying a new Monitor, or get a new laptop which is not a Macbook?

I have the same issue with my 2019 16-inch MB Pro. Connecting to a Philips Brilliance 328P USB-C-screen. Shuts off, and have to be rebooted with the fingerprint/power-button. My MacOS is Catalina 10.15.5.

No changes after update for me. I have my MacBook closed on a stand, and use external apple keyboard and mouse. This does not work, since the computer has shut off. Even if i disconnect the screen and open the MacBook, it takes some time before it restarts, and the Apple-logo shows.

I figured out that the fan spins rapidly and the computer shuts down after about 10-15 minutes in sleep-mode.

Reseting NVM-RAM and SMC did not help.

Having the exact same problem. Brand new 16" - i9 2.3ghz, with a Dell U3417W.

Allowing the computer to fall asleep with the external display connected results in a hard crash.

Possibly related (?) - and curious if others see this too - when plugging in the monitor, after everything switches over and the monitor comes on there's a brief blue flash a few moments after. It's brief, doesn't impact anything, but it always happens - also happens whenever the switchover takes place (closing the lid will trigger it, so will opening it)

I also had a crash once while randomly plugging the monitor into different usb-c ports to see if the blue flash was only occuring in specific ports. It's not, it's in all of them, and trying to figure that out gave me a hard crash. Can't reproduce that easily though.

Similar issue here.

2019 16 inch MacBookPro

LG UltraFine 4k Display

My system will crash doing graphic intensive work like rendering video in Adobe Media Encoder or Adobe Premiere Pro. If I unplug my monitor I have no issues. Super Frustrating.

I agree, it sounds like it's a design problem. When I was running a heavy work in my editing software maxing out the CPU/GPU, even the battery started dropping (although it was plugged in all the time). And it crashed, obvioulsy.

My gut feeling is that this MBP16 is not really intended to be used with external screen and computer tucked away somewhere as if it was a desktop. It's a laptop first and foremost, with the potential to be hooked up to a monitor every once in a while.

Just today. I’m also finding it hard to believe since it was such a mess. Also I got the entire laptop replaced basically. But its working and it never has before so fingers crossed it continues. Totally insane it took 6 major versions to get it sorted out. Apple qc really went right off a cliff.

I'm experiencing the same issue. The 10.15.2 update did not fix this issue for me.

same for me, same setup as you, very frustrating,

sometimes flashes on and off, sometimes just doesn't respond at all after wake up.

I'm still getting the problem after upgrading to 10.15.3

I'm also still having this problem with 10.15.3

The only solution for me so far is to restart.

For what I heard the next update .4 will help solve some issues with the GPU, hopefully it will fix this issue as well.

I have the exact same problem. Very reproducible and have taken multiple videos with my phone to demonstrate problem. Absolutely infuriating.

Running Catalina 10.15.3 on 16" Macbook Pro

I upgraded to 10.15.4 beta3, with the hope of some improvement. Nope... seems about just as bad as ever.

I'm still having the same problem with external monitors not turning back on. I have now tried both ports on the Mac. Would be great if we can gets this fixed Apple, as it been 3 MONTHS now.