The thunderbolt 3 to thunderbolt 2 adapter doesnt work with external monitors

Discussion in 'MacBook Pro' started by Caribbean Mac, Dec 26, 2016.

  1. Caribbean Mac macrumors member

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    Dominican Republic
    #1
    I just changed my 2009 17" macbook pro which I used to hook up to my 32" 1080p external monitor via a Thunderbolt 2 to HDMI 2 adapter with no problems at all. I bought the new 2016 15" retina MBP with the Apple original USB-C (thunderbolt 3) to thunderbolt 2 adapter but the new MBP doesnt connect to the 3 different brand monitors. HELP!!
     
  2. Creep89 macrumors 6502

    Joined:
    Mar 9, 2012
    #2
    Yeah because the TB3 -> TB2 adapter does not carry video signals. Get a USB-C -> HDMI adapter or USB-C -> DisplayPort if your monitor has DP in.
     
  3. Macalway macrumors 68020

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    Aug 7, 2013
    #3
    It's cool, but a confusing mess. I was going to post some info but got lost in it :D
     
  4. SoyCapitanSoyCapitan macrumors 68040

    SoyCapitanSoyCapitan

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  5. Caribbean Mac thread starter macrumors member

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    Jul 16, 2008
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    Dominican Republic
    #5
    I bought also the USB-C to HDMI and it doesnt work with the external 1080p monitors... it doesnt even recognize any of the 3 in the display preferences
     
  6. treekram, Dec 26, 2016
    Last edited: Dec 26, 2016

    treekram macrumors 6502a

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    #6
    There's a lot of people confused about the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 (Mini DisplayPort connector) adapter. It should work if you have Thunderbolt monitors. Check the specs of the your monitors - if it doesn't mention Thunderbolt, it's not a Thunderbolt monitor. Thunderbolt 2 uses the Mini DisplayPort connector but the Apple adapter does not carry a DisplayPort signal. So while the cable will connect properly, it won't work. You would need a USB-C to DisplayPort adapter/cable.

    If you do have Thunderbolt monitors, there was a post here about somebody having one USB-C port (out of 4) that wouldn't output a video signal (defective computer). The adapter may also be faulty. These two possibilities may also explain why a USB-C to HDMI adapter/cable won't work.

    http://forums.macrumors.com/threads/hdmi-not-working-on-rear-left-usb-c.2023744/
     
  7. Caribbean Mac thread starter macrumors member

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    Jul 16, 2008
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    Dominican Republic
    #7
    Apple should really make sure its adapters USB-C and Thunderbolt 3 are downward compatible with its own technologies (ei thunderbolt 2 and 1, firewire, etc) as well with HDMI 1.3, 1.4, 2.0 and displayport if it wants the MAC to be a real office laptop
    --- Post Merged, Dec 26, 2016 ---
    Also the Sierra OS on the new 2016 15" MBP doesnt provide any messages related to connected monitor nor the adapters ... it is a mute dumb system with no support messages
     
  8. xraydoc macrumors demi-god

    xraydoc

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    #8
    Since the TB3-TB2 adapter doesn't carry video signals, how would the computer know there's a monitor plugged in to it?

    Either way, that adapter's documentation states it doesn't support mini-DisplayPort video/monitors. As others have said, it supports data peripherals only.

    TB2 and mDP use the same connector, but they aren't the same data/protocol (though TB2 can embed DP video).

    [to confuse the issue, it will support the Apple Thunderbolt Display, including video and its attached peripherals - however this is a Thunderbolt Display, not a conventional mDP display]
     
  9. poorcody macrumors 6502

    poorcody

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    Jul 23, 2013
    #9
  10. therealseebs macrumors 65816

    therealseebs

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    Apr 14, 2010
    #10
    The problem is that the ports on the old Macs were both "thunderbolt 2" and "mindisplayport", and you're not given any obvious indicator that these are completely different things. So if you have a "thunderbolt 2 to HDMI" cable, what you really have is a "minidisplayport to HDMI" cable. Which may have been mislabeled, because vendors didn't want to try to explain that.

    And Apple's communication on this isn't great; the packaging for the TB3->TB2 adapter actually shows (without words) connecting the cable to a monitor. I assume it's a Thunderbolt display, but they don't say that on the packaging, so if you just look at the packaging, you have a thing that gives you the small connector you remember from TB2, it says TB2, and it shows that being connected to a monitor, just like your TB2 port connected to monitors... That's pretty much a great way to create customer confusion.
     
  11. norbeger macrumors newbie

    norbeger

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    Dec 26, 2016
  12. Caribbean Mac thread starter macrumors member

    Joined:
    Jul 16, 2008
    Location:
    Dominican Republic
    #12
    Thanks for helping this USB-C to HDMI adapter should come by default with each new 2016 MBP Shame on Apple for not removing ports without providing viable "new" untested Thunderbolt 3 aka USB-C that almost no monitor supports.
    --- Post Merged, Dec 26, 2016 ---
    On the spot your comment.... so Apple wants us to dump our monitors and purchase a 1K new monitor just to use the USB-C or thunderbolt 3 new limited port?
     

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