The connection works perfectly fine with the 2.4GHz/32Gb, but doesn't work with the 2.3 GHz/64Gb model - can someone help me to understand why? (I'm aware that the OS isn't supposed to be compatible, but why then on one & not the other?? Is it just hit & miss?)
[I should mention that all of the C ports have been tried on the MBP & are fine - a VGA monitor to C works.]
MacBook Pro (2017 – 2020)
rkaufmann87 wrote:
Target Display Mode has been dead since 2014, over a decade ago. Please carefully read Target Display Mode to learn what will work in Target Display Mode, a 2019 MBP is NOT a supported device!!!!!!!!!!!!!!!!!!!
Actually, a 2019 MacBook Pro is a supported video source … when running Catalina.
Not that it would make a lot of sense to stay on Catalina, and spend $80+ for Thunderbolt connection hardware, just to reuse an old 21.5" 1920x1080 or 27" 2560x1440 iMac display.
Target Display Mode has been dead since 2014, over a decade ago. Please carefully read Target Display Mode to learn what will work in Target Display Mode, a 2019 MBP is NOT a supported device!!!!!!!!!!!!!!!!!!!
Is it just hit & miss?
Probably. There have been a few anecdotal reports of TDM working with devices that are not supposed to work. Don't tell anyone.
I already had it running on my 2018 MBP, so no extra expense there. I need an app on the old iMac for now, so I need to keep it &, naturally, it's a waste to not be able to utilise the screen. I just don't understand why one 2019 MBP works & another doesn't - I was hoping someone might know why. No matter, thanks anyway.
Why does Target Display work between my 2012 iMac & one MBPro, but not this same-year-model one?
