macbook pro 2014 retina display with thunderbolt 2 to usbc external monitor connectivity

Dear group,
I have connectivity issues trying to use the above macbook pro to drive LG 4K ( lg27UK850) display with USBC ( not thunderbolt 3) without losing resolution . There are major issues with the thunderbolt 2 ports as no adaptors available with a thunderbolt 3-usbc female and thunderbolt 2 male. I would loose resolution if I use the HDMI port. Suggestions please?

  • Asked by fn
LG UltraFine 4K Display

LG UltraFine 4K Display

Product No Longer Available

1 Answer from the Community

  • Use an Apple Thunderbolt 3 to Thunderbolt 2 adapter to connect a Thunderbolt 3 device that has two Thunderbolt 3 ports (such as a Thunderbolt 3 dock or Thunderbolt 3 hard drive enclosure). The second Thunderbolt 3 port can be used for USB-C output to the display (USB with DisplayPort alt mode).

    With video coming from USB-C, only USB 2.0 will be supported by the downstream USB ports of the display because 4K 60 Hz DisplayPort 1.2 uses all four super speed lines in the USB-C cable, leaving only the USB 2.0 lines available for USB.

    To use the HDMI port of the display for 4K 60 Hz HDMI 2.0, you will need a DisplayPort to HDMI 2.0 adapter because the MacBook Pro 2014 does not have an HDMI 2.0 port.

    To use the DisplayPort port of the display for 4K 60 Hz DisplayPort 1.2, use a mini DisplayPort to DisplayPort cable or adapter.

    In the case where you use either the HDMI or DisplayPort inputs, you can also connect a USB-C to USB-A cable which will allow USB 3.0 to be supported by the downstream USB ports of the display.

    • Answered by Joseph V from Fort Langley