LG UltraFine 5K - Issues/bugs

no_more

macrumors newbie
Sep 13, 2016
10
1
Did anyone experience the lack of adjusting brightness? Can't adjust brightness after LG app update.
UPD: Everything is ok again. I have LG Thunderbolt Cable, tried to pull it out and it didn't help. When I turned it upside down, the brightness worked again.
 
Last edited:

King724

macrumors newbie
Jan 7, 2015
16
2
Cool - that gives me some confirmation on what to look for. I cannot afford to be burned a 3rd time by this damn monitor.

Appreciate the info
I have an original 5k ultrafine that has horrible image retention now (3 years later)...

I would also appreciate anyone who has used the latest 5k ultrafine for a while comment on any retention issues with the latest monitor. I am thinking about replacing my original. Thanks!
 

cp21yos

macrumors newbie
Jan 11, 2002
11
0
Sydney
I have the original since it became available in Australia and it's been in use everyday and I'm not seeing any image retention… the only problems I have is the brightness bug and occasionally since Catalina the usb hub crashes and I have to cold start the monitor to get it back up.
 

Korg86

macrumors newbie
Mar 14, 2020
3
0
Two questions:
1). Is it normal for my MacBook Pro 16" (Late 2019) to be running noticeably hotter than normal on an ongoing basis when connected to the LG UltraFine 27" display? Anyone else experience this? Any issues with diminished MacBook longevity or overheating?

2). The Apple.com product page for the LG UltraFine 27" product states the follow in the description: "For optimal performance on the 16-inch MacBook Pro, connect to power using the MacBook Pro’s 96W adapter." To be 100% clear: Is this telling me to connect the MacBook Pro to a wall outlet using the standard included charger, simultaneously while connecting the LG UltraFine display (which also plugs into the wall) into the other port?

I know the 2nd one sounds like a dumb question, I just wanted to be 100% certain. Any idea why Apple stated this in Q#2?

Thanks in advance! Cheers!
 

cp21yos

macrumors newbie
Jan 11, 2002
11
0
Sydney
  1. My MBP 16" (8 core variant) runs hotter than the previous 2019 15" (also 8 core) but I think it's Ok, in the sense that it can dump more heat apparently than the previous 15" — given that it's driving an external 5k monitor that could account for the difference (vs. not connected to 5k).
  2. The LG 5k Ultrafine has a 200W power supply built-in, 140W is used by the 5k IPS screen so that leaves at best 60W for your MacBook Pro (presuming you don't have other power sucking devices on the USB-C ports) — which ships with a 96W adapter. I couldn't find anything on LG's 5K monitor page to say what the power output on the Thunderbolt port was so I'm guessing if you're running your 16" flat out it won't be sufficient to power it.
I haven't experienced it with the 16" yet, but with the 15" I could flatten the battery while plugged in if I was training a large image model (couple 100k of images) or running a long Xcode build workflow (think hours).
 

maxsquared

macrumors regular
Jun 27, 2009
165
48
  1. My MBP 16" (8 core variant) runs hotter than the previous 2019 15" (also 8 core) but I think it's Ok, in the sense that it can dump more heat apparently than the previous 15" — given that it's driving an external 5k monitor that could account for the difference (vs. not connected to 5k).
  2. The LG 5k Ultrafine has a 200W power supply built-in, 140W is used by the 5k IPS screen so that leaves at best 60W for your MacBook Pro (presuming you don't have other power sucking devices on the USB-C ports) — which ships with a 96W adapter. I couldn't find anything on LG's 5K monitor page to say what the power output on the Thunderbolt port was so I'm guessing if you're running your 16" flat out it won't be sufficient to power it.
I haven't experienced it with the 16" yet, but with the 15" I could flatten the battery while plugged in if I was training a large image model (couple 100k of images) or running a long Xcode build workflow (think hours).

Point 2 it is mentioned on LG's product page, it provides 94W of power.

 

poorcody

macrumors 6502a
Jul 23, 2013
828
638
FYI, the release notes for 10.15.4 (out today), had this listed:

- Fixes an issue with screen brightness for the LG UltraFine 5K display after waking from sleep

Haven't tried it yet myself.
 

defn

macrumors regular
Apr 25, 2015
104
126
10.5.4 fixed the wake from sleep issue for me.

But good lord, the image retention on this is getting from bad to worse. (Mine was purchased in December 2016)
 

poorcody

macrumors 6502a
Jul 23, 2013
828
638
FYI, 10.5.4 seems to have fixed both the wake-from-sleep and brightness persistence issues for me.

I'm not seeing any image retention on my LG 5K Ultrafine. I do have the desktop picture rotating every 10 minutes, maybe that helps? (Although I don't see any problems in the menubar either.) I have one of the original 5K's bought in November or December 2016.
 

cambookpro

macrumors 604
Feb 3, 2010
6,524
1,982
United Kingdom
Just noticed this small mark (~2.5mm x 1mm) on my screen. It appears dark when sitting face on, and light when viewed from above. Anyone else experienced similar? Phoned LG and they want it for 10 days to repair. A little inconvenient but now I've seen it, I can't un-see it!



Sent this away to LG's repair centre yesterday (I'm assured that this was still okay to do during the pandemic, in any case I've got my old Thunderbolt Display out as I'm anticipating some delays), their theory of what it was brings a new meaning to this thread's title...

They think it could be a literal bug that has died behind the screen and causing a mark! :oops:
 

chris4565

macrumors 6502
Sep 22, 2018
427
114
They think it could be a literal bug that has died behind the screen and causing a mark! :oops:
Maybe one of these thrips. I've already read multiple reports regarding TVs etc. that these get trapped sometimes behind the panel. I even had this exact problem too one day many years ago.
 
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