Connecting 2 x LG Ultrafine 4K 22" (Older Model) & Belkin Thunderbolt 3 to MacBo...
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Connecting 2 x LG Ultrafine 4K 22" (Older Model) & Belkin Thunderbolt 3 to MacBook Pro  


Active Member
Joined: 2 years ago

Dear Members

Thanks for your insights and ideas but I still struggle to connect both displays.

My set up is as follows:

  • MacBook Pro 13” 2016 4 x thunderbolt 3 ports – Mac os Catalina
  • Belkin Thunderbolt 3 Pro
  • 2 x 22” LG Ultrafine 22md4k
  • Club 3D USB C to Display port Cable 1.4 8K 60Hz, 4K 120Hz and Displayport to USB C bi-Directional


My issue is that monitor connected via display port (from Belkin) to USB-C (on monitor) does not turn on although I can see its name appear in settings on my MacBook pro rig + HP Elitebook. Based on previous posts I have read, the 22md4k version needs additional power in order to work.

Do you believe that buying Hauwei VR2 cable to connect my Belkin Thunderbolt 3 Pro to monitor will work? Do you have any other ideas how to tackle this problem considering my set up?

Alternatively, I can plug 2 separate cables on my MacBook pro and it works but issues is with my HP Elitebook which has 1 x USB-C x HDMI port. For this reason, I bought Belkin Thunderbolt 3 Pro to connect via display port.

I slowly start to lose hope using both screens at the same time on my Mac + HP Elite Book.

Appreciate your support and thanks in advance,

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.


Noble Member
Joined: 4 years ago

The old (21.5 or 22 inch, 4096 x 2304) LG UltraFine 4K displays require a USB-C connection that includes USB 2.0 to function.

Here's a list of options:


Mac mini (2018), Mac Pro (Early 2008), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Radeon Pro W5700, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case