10 Replies Latest reply: Jan 24, 2012 11:15 AM by cmelbourne91
jontafin410 Level 1 Level 1

I have a MacBook Pro and all of the necessary cables in order to display my computer on my tv screen. I have my tv to the right setting and connected to my computer to the DVI port. I have a LG HDTV when I plug my cords in my computer screen turns blue like it recognizes that it is connected to the TV but nothing happens on my TV and it still says that there is no signal. It has to be some sort of setting on my TV. Any help is greatly appreciated thanks. Also I was wondering if there is a way to run the sound through the TV using the cords I have. Thanks

MacBook Pro, Mac OS X (10.7.2), HDMI to DVI video and sound output
  • andyandywells Level 1 Level 1

    HDMI with audio support carries audio.

    HDMI without audio support does not carry audio.

    You cannot run sound through the TV using the DVI HDMI you currently have, no.


    Try the LG website for support, as it seems to be the TV that is the issue.

  • cmelbourne91 Level 1 Level 1

    To view this, make sure your MBP monitor is on at the time, and also the TV. The screen should be recognised automatically, but the chances are you need to check mirror imaging. if you go to settings > Displays > Arrangements and there will be a box called mirror-imaging or something along these lines, check this box, and your image should appear.

  • OGELTHORPE Level 8 Level 8

    For sound you will need an extension cord with the same plug configuration that goes into you audio output port.  In addition you will need a 'Y' connector to hook up with the afore named extension and two RCA connectors to hook up to the two audio inputs in the LG TV.



  • jontafin410 Level 1 Level 1

    Could it be anything to do with the quality of my HDMI cord? I have a much shorter cord that works perfectly fine but my longer one doesn't work

  • cmelbourne91 Level 1 Level 1

    if you are requiring both sound and picture, then you need to use the new thunderbolt cable, this is easily found on amazon, they work on both the newest MBP and the version before as these are the two that i own.

    http://www.amazon.com/Mini-DisplayPort-HDMI-Adapter-Cable/dp/B003OC6LWM/ref=sr_1 _2?ie=UTF8&qid=1327363015&sr=8-2

    this is the exact cable i use, and i get both picture and sound.

    Apple are saying that audio doesnt work with the older version of the MBP, but it does with this cable.

    Hope this helps.

  • jontafin410 Level 1 Level 1

    This is the 15' HDMI cable I just bougt yesterday http://www.amazon.com/gp/product/B000O5N5AI/ref=oh_o01_s00_i00_details and this is the adapter that I have http://www.bestbuy.com/site/Rocketfish%26%23153%3B+-+Mini+Display+Port-to-HDMI+A dapter/2343706.p?id=1218321954502&skuId=2343706 this combination doesn't display anything. I'm probably going to buy another one even though this works on my friends Toshiba.

  • OGELTHORPE Level 8 Level 8

    cmelbourne91, greetings:  The OP says his MBP has a DVI port.


    "I have my tv to the right setting and connected to my computer to the  DVI port,"


    That means he has an older model that predates the minidisplay/thunderbolt port and that cable is incompatible with his MBP.  That HDMI cable will work for sound only for 2011 MBPs.  All others require separate connections for sound.



  • cmelbourne91 Level 1 Level 1

    I agree, that this is true with lack of sound etc. however i have the late 2010 edition, and the thunderbolt cable does work for mine with both picture and sound, however, with an adapter, the sound doesnt work. the thunderbolt cable is compatible wt my late 2010 MBP, even though it has no thunderbolt port, it is exactly the same fit as a mini display port, and so is compatiable. i bought mine for less than £10 and i have perfect picture and sound with a 2010 version MBP.

  • OGELTHORPE Level 8 Level 8

    cmelbourne91, greetings:  It is true that an HDMI cable is capable of transmitting sound.  The Thunderbolt port transmits both sound and video.  How you connect your MBP is not the issue of this post (because your MBP does not have the same output port for video), rather how jontafin410 is able to do so.


    jontafin410 has an older MBP without a thunderbolt connector .  His MBP has a DVI connector that supports only video.


    Yes he needs a DVI/HDMI adapter but that does not solve the sound issue. Are you proposing that he tap into the HDMI cable in order to get sound?  I know of any no adaptor that combines DVI video and sound output from a MBP and connects to a HDMI cable.  If there is, let me know.



  • cmelbourne91 Level 1 Level 1

    I agree with what you are saying, that his MBP doesnt have a thunderbolt port, and shouldnt work, but it will do so. It is the same port in essence being the same shape. It acts in exactly the same way as a DVI, if you want sound and picture, simply get the cord that i have recommended. My personal MPB also has a DVI port, and not a thunderbolt port, as i dont have the new version.  But for some reason it seems to double up as the same port, even though at first glance it seems to be a completely different port.


    A member of my family bought a brand new MBP only a few weeks ago, and decided to get  a thunderbolt to HDMI lead, no adaptors needed, and this gives both sound and picture not only to the late 2011 version, but to older versions also.


    Note that i have an old version MBP,  WITH DVI, and a thunderbolt cable gives me picture AND sound.