Macbook air to tv problem

Discussion in 'MacBook Air' started by crod44305, Jan 2, 2011.

  1. crod44305 macrumors newbie

    Jan 2, 2011
    So i recently got an 11" macbook air. I also got a mini displayport to hdmi cable to hook it to my tv. It works on my 4 year old 37" lg lcd tv but not my brand new 50" samsung plasma. the macbook recognizes that its hooked up to a samsung tv as an external display but nothing is showing up on the tv. The tv recognizes that there is an hdmi device plugged in but it just says no signal. Any thoughts? Also, on my lg tv where it is working, the picture is cut off on the edges no matter what resolution i put it on. And im also not getting any sound output to the tv. The system profiler says it supports audio over hdmi/mini displayport, yet when connected to the tv there is no option to send audio to anything but the standard computer speakers.

    Any help would be greatly appreciated :)
  2. Hellhammer Moderator


    Staff Member

    Dec 10, 2008
    Have you tried another HDMI port on the TV? Tried the ports with other devices?

    It's normal that the picture isn't full screen due to overscan issues. Try enabling overscan, it should make it better.
  3. Fuchal macrumors 68020

    Sep 30, 2003
    Most TVs have a display option with the "zoom" feature called "Dot by dot", "Pixel by Pixel" etc that will show the full screen without overscan.
  4. crod44305 thread starter macrumors newbie

    Jan 2, 2011
    yeah ive tried all the hdmi ports. cant figure it out for the life of me
  5. gentrysama macrumors newbie

    Jan 19, 2006
    Sony Bravia

    Same here, I have the 13" Air and a Sony Bravia KDL 32 EX 500, and the computer recognizes the TV, but the TV says something like "unrecognized signal" (I'm probably not quite right on that error mssg). I've tried all 4 HDMI ports. The Sony has a dedicated computer input via VGA but the adapter I bought is HDMI and I don't want to have to return it. Also, the adapter receives good ratings and is shown to work, even audio. I can't figure it out, any help?
  6. jksu macrumors regular

    Nov 26, 2009
    works for me...

    that's strange -- my mba11 with the hdmi adapter (ebay) works fine with our samsung PN50A450 (50" 720p plasma) we bought 1.5years ago.

    i have it plugged into a long hdmi extension that's going into the input port on the side of the tv (hdmi3? i think) and i get video and sound streaming -- much nicer than with my blackbook that required video out and a separate line-out to rca cable for audio.

    looks awesome, resolution makes me want to surf from the couch.

    did you try another adapter?
  7. crod44305 thread starter macrumors newbie

    Jan 2, 2011
    i havent tried another adapter. this adapter works on my older lcd tv so im not sure whats going on
  8. Drewski macrumors regular

    Jan 6, 2011
    Somewhere else
    I have only hooked up my PC to our brand new TV so not sure if this applies. But everything else in your post describes my experience.

    I eventually discovered that the signal has to be in the TV's native resolution first. So for the PC, I added a second display, then changed the properties of the second display to match that of the TV (I think it's 1920 x 1080). Unlike a dedicated monitor, the TV didn't just accept whatever resolution I was sending, even though I changed the resolution while the two were connected.

    There was a bit more fiddling around to get it to work (unplug the HDMI cable, turn on tv, plug cable in, change TV to primary monitor, extend desktop across two monitors, etc. etc.) and I don't exactly recall what order that was in, but the key part I was missing was to have the resolution correct *before* I turned on the TV, unlike my 5 year old HDTV which showed the (distorted) desktop as soon as I plugged it in.

    Let us know if you get it to work; I want to pick up one of the Apple adapter$ to connect her MBP to the TV. Of course, I have to go "hi-tech" with the extra audio cable too, since her MBP is an older 2.26 model with "video only" displayport... :mad:

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