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MikeRaftery Author

Level 1

19 points

Thunderbolt 2 display with new 2020 MBP

I've been using my 2017 MBP with my older Thunderbolt 2 display for years. I use Apple's TB2-TB3 adaptor cable. Just got my new 2020 MBP and everything is looking good except the new laptop won't recognize the older display. Both laptops are Touch Bar model. I checked with system report and the new laptop is not seeing the thunderbolt connection. The old laptop sees it and connects. Old laptop thunderbolt bus firmware version is: 41.4; New laptop bus firmware version is 80.0. Tried SMC reset, power disconnects & even MACOS reload. No joy.

Any ideas?

MacBook Pro with Touch Bar

Posted on Jun 19, 2020 5:56 AM

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MikeRaftery Author

Level 1

19 points

Posted on Jun 19, 2020 1:33 PM

Issue solved; my TB2 display has a bad (or at least marginal) cable. I used a seperate TB2 cable that I had on hand and plugged it into the spare TB2 connection spot on the back of the monitor and BINGO - the laptop connected. Didn't know you could do this. I guess it makes sense that both connections come together at the same bus inside the monitor. Anyway; problem solved. Hope this helps someone down the road.

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Thunderbolt 2 display with new 2020 MBP

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