LG 34WN80C will not work with HDMI with MacBook Pro 16 but works fine with new MacBook Pro 13

Question

Level 1

8 points

LG 34WN80C will not work with HDMI with MacBook Pro 16 but works fine with new MacBook Pro 13

Have a LG 34WN80C it will only connect via usb-c cable to MacBook Pro 16. Using same HDMI hub and cable it connects fine to a MacBook Pro 13.

I can connect a LG 34UM61-P to the MacBook Pro 16 via the same HDMI hub and cable.

MacBook Pro 13 and 16 works with LG 34UM61-P via HDMI

MacBook Pro 13 and 16 works with LG 34WN80C via USB-C

MacBook Pro 13 works with LG 34WN80C via HDMI

MacBook Pro 16 DOES NOT with LG 34WN80C via HDMI

Any ideas why or what will resolve this issue?

MacBook Pro 16″, macOS 10.15

Posted on Nov 28, 2020 9:13 AM

Reply

Answer 1

Nov 28, 2020 9:48 AM in response to fjsandiego

That "4K" display is not expected to work reliably at best quality over HDMI. HDMI is for consumer devices such as HD TV sets.

If it is working fine when connected over USB-C cable [which has DisplayPort protocol embedded], then it is working as designed.

Reply

Answer 2

fjsandiego Author

Level 1

8 points

Dec 2, 2020 12:05 PM in response to Grant Bennet-Alder

Thanks for the information. The LG 34UM61-P is sold as a computer monitor and only has HDMI inputs. I'm trying to use both at the same time and thought using HDMI on both would solve the issue but since the LG 34WN80C doesn't work with HDMI I'm stuck. Would using a HDMI to USB-C or HDMI to DisplayPort maybe help?

Reply

Answer 3

Dec 2, 2020 3:13 PM in response to fjsandiego

The cables you want for HDMI-only Monitors (higher resolutions than HD TV sets) are marked as Certified with an anti-counterfeiting tag and are labeled:

"Premium High Speed HDMI cable" or that + "with Ethernet" --OR-- (even better):

"Ultra High Speed HDMI cable" or that + "48G"

Cables with No Certification tags are good for your standard TV set, and not much more.

Reply

LG 34WN80C will not work with HDMI with MacBook Pro 16 but works fine with new MacBook Pro 13

Similar questions