Will this adapter allow me to use a 2015 Retina MacBook Pro with an LG UltraFine 4k display?

I understand that the LG UltraFine 4k display uses USB-C and the 2015 Retina MacBook Pro has two thunderbolt 2 ports. Should this adapter work with a thunderbolt 2 cord to connect these two devices?

Answer

Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter

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  • No, the Thunderbolt 3 to Thunderbolt 2 Adapter only transmits Thunderbolt signals and is therefore only for connecting Thunderbolt devices.

    A Thunderbolt device is required to convert Thunderbolt signals to DisplayPort or HDMI.

    The Thunderbolt ports of the MacBook Pro can also send DisplayPort signals, but the LG UltraFine 4K requires both USB and DisplayPort signals over a USB-C cable.

    Therefore, to connect the LG UltraFine 4K display to a 2015 MacBook Pro, use the Apple Thunderbolt 3 to Thunderbolt 2 adapter to connect a Thunderbolt 3 device or dock that has two Thunderbolt 3 ports or a USB-C port that supports DisplayPort alt mode.

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