Connecting Macbook Air via HDMI

Discussion in 'MacBook Air' started by Faux Carnival, Sep 30, 2011.

  1. macrumors 6502a

    Joined:
    Aug 1, 2010
    #1
    Hello, I bought a Kanex Mini DP to HDMI cable. (not an adapter)

    So, I want to connect my computer to a Full HD TV. I plugged in the cable. The image is so grainy, literally nothing is visible. What might be the problem?

    After I plug in the cable, is there something I should do additionally? The image is not mirrored by the way. I see different things on the screens. Plus, I can't control the cursor on the TV.
     
  2. Moderator emeritus

    Hellhammer

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #2
    Have you checked the resolution from display preferences? It should be plug&play.
     
  3. thread starter macrumors 6502a

    Joined:
    Aug 1, 2010
    #3
    I can't see Plug&Play. Under Displays, the resolution is set to 1440x900.
     
  4. Moderator emeritus

    Hellhammer

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #4
    Plug&play = Plug it in and it works without any tweaks

    You should have two resolution there. The 1440x900 is for your MBA's screen, while the TV should have 1920x1080. If the TV is not recognized at all, then it sounds like your cable is defective.
     
  5. thread starter macrumors 6502a

    Joined:
    Aug 1, 2010
    #5
    I finally got it working. I set the TV's resolution to 1080p. However, the display doesn't fill up my TV screen.

    The bigger problem is, the display is still grainy. Flickering white dots appearing all over the screen.
     
  6. Moderator emeritus

    Hellhammer

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #6
    Sounds like there is a problem with your cable. I would get it changed.
     
  7. thread starter macrumors 6502a

    Joined:
    Aug 1, 2010
    #7
    I tested the cable with a Macbook Pro 2009. It seems to work fine.

    Is there a problem with my port? Is this problem due to the new Thunderbolt or should all cables work fine?
     
  8. macrumors 603

    Joined:
    Jun 14, 2010
    Location:
    US
    #8
    If everything is just fine with the same cable and TV with a MBP, then it sounds like you have a problem with your Air. You shouldn't be seeing a grainy white-flecked display. I'd have Apple take a look at it.

    I use a third-party HDMI adapter with my MBA for both a 46" Samsung TV and a 24" 1080p monitor. Works fine with a very crisp image. I did have to bump up the underscan setting (Preferences->Display) a little on the TV.
     
  9. macrumors 6502

    Joined:
    Apr 15, 2010
    Location:
    San Diego
    #9
    I use a Moshi mini DP to HDMI adapter for my MBA with no troubles. Full 1080p on the Samsung via the Onkyo 706. Samsung is set to 1:1 pixel mapping by default.
     
  10. macrumors regular

    Joined:
    Mar 16, 2009
    #10
    Rather than duplicating topics I have a question.

    Is it simply a case of buying an HDMI to Mini Display Port adapter and plugging it in?

    Is there anything specific ref spec of the adapter or any brands recommended that I should be aware of?

    Thanks
     
  11. macrumors 603

    Joined:
    Jun 14, 2010
    Location:
    US
    #11
    Yes and no. After plugging in the adapter, you may need to go to SystemPreferences->Sound to set sound output to go to HDMI. This should be remembered and switch batch & forth when you plug in / remove the adapter. You may also want to go to SystemPreferences->Displays and adjust the underscan setting depending on the device you're attached to. I needed to do that for my TV, but not for my 24" monitor. Also make sure you set the Display preference not to mirror displays else you may get some wonky results; set the HDMI output to 1080p or 720p as appropriate to the device you're attaching to.

    Also, it used to be important to ensure you bought a miniDisplayPort to HDMI adapter that supported audio since earlier Macbooks didn't support audio to HDMI. I believe this is less of an issue these days.

    I've seen good reports about the adapter from monoprice.com which is also a great source for good, inexpensive HDMI cables.
     
  12. macrumors G5

    Macman45

    Joined:
    Jul 29, 2011
    Location:
    Somewhere Back In The Long Ago
    #12
    It's Either The Cable

    Or maybe...The TV? OP: what's the make and model of your TV?
     
  13. macrumors member

    Joined:
    May 22, 2011
    #13
    I second monoprice. I got mine for ~$8 shipped
     
  14. thread starter macrumors 6502a

    Joined:
    Aug 1, 2010
    #14
    Do you think I'll get a replacement or is Mini Displayport/Thunderbolt port repairable?
     
  15. Moderator emeritus

    Hellhammer

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #15
    Thunderbolt is part of the logic board so it can be fixed by replacing the whole board.
     
  16. thread starter macrumors 6502a

    Joined:
    Aug 1, 2010
    #16
    So the SSD gets replaced? I'm worried about my personal data.
     
  17. macrumors 603

    Joined:
    Jun 14, 2010
    Location:
    US
    #17
    It shouldn't. The SSD is not soldered in and unplugs from it's spot.
     
  18. macrumors demi-god

    JHUFrank

    Joined:
    Apr 16, 2010
    #18
    You back up that data before you take it in. YOU are responsible for your precious data, don't trust it with anyone.
     
  19. thread starter macrumors 6502a

    Joined:
    Aug 1, 2010
    #19
    The situation is getting even more interesting. It turns out that my Mini Displayport is fine. I tested with an Apple display.

    To remind you, I had a Kanex Mini Displayport to HDMI cable. It doesn't work on my 2011 Macbook Air but it works on a 2009 Macbook Pro.
     
  20. macrumors newbie

    Joined:
    Aug 8, 2013
    #20
    hey there , seems for me i have the same issue
    i wanna connect my macbook air 13" to my dell S2340L 1080P,
    seems like when select resolution for dell at 1080P, the monitor will have the same flash issue, really bad, so wondering how r u solved your issue?

    and for me i also tested the cable with my gf's macbook pro, seems perfectly fine.


    thanks!
     
  21. AXs
    macrumors 6502a

    AXs

    Joined:
    Sep 7, 2009
    #21
    Use Moshi miniDP to HDMI. It works great. worth the 30-40bucks. And depending on where you buy it from, you may get 1 year warranty as well. I did.

    You can get the low-cost chinese replicas, but from experience - they're going to break or dieout not long after you get em.
     
  22. macrumors 6502

    Joined:
    Jul 20, 2013
    Location:
    Toledo, Ohio
    #22
    I picked one from monoprice $6.65. Monoprice has a lifetime warranty on their cables
     
  23. AXs
    macrumors 6502a

    AXs

    Joined:
    Sep 7, 2009
    #23
    'Lifetime warranty' is just a marketing pitch. There's always an ambiguity, or a catch... especially at value stores.

    Good luck getting it replaced in 3 months.

    But eh, on another note, you could buy 5 this year and still would have spent less than I did so I guess it's a good buy regardless for people that live there.
     
  24. macrumors 6502

    Joined:
    Jul 20, 2013
    Location:
    Toledo, Ohio
    #24
    I always had good luck with Monoprice

     

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