No signal with Mini DP > HDMI and 4k monitor

Discussion in 'MacBook Pro' started by niklamacz, May 28, 2015.

  1. niklamacz Suspended

    Mar 10, 2015
    Hello, MR

    I got a new 4k monitor (Acer S277HK / 3840x2560 at 60 Hz). I have tried connecting it to my rMBP late 2013 with an HDMI cable and it worked perfectly fine (with 4k at 30 Hz or 1440p at 60 Hz). However when I tried to connect it with another cable (mini DP > HDMI), the screen remained black.

    Could it be just a faulty cable, or is ti because it simply doesnt support 4k resolution? If so, then how can I choose another mini DP > HDMI cable that supports 4k?

    Thank you for your answers
  2. Freyqq macrumors 601

    Dec 13, 2004
    You should really be using mini-dp to dp to get 60hz at 4k. No idea what that issue is though. Most likely, the cable doesn't support 4k.
  3. niklamacz thread starter Suspended

    Mar 10, 2015
    Thank you for your reaction,

    the problem is that I am limited to use of HDMI only, since I want to use my audio processor for wireless headset Sony MDR HW700DS. That's why I can't use a displayport cable. Also, Iris 5100 is not really capable of 4k resolution at 60 Hz, so I am either going to stay at 4k @ 30 Hz or 1440p @ 60 Hz (I still havent decided).

    Do you think there is a mini DP > HDMI cable that would work with my setup?
  4. Freyqq macrumors 601

    Dec 13, 2004
    Try to find a mini-dp to HDMI 2.0 cable. If that exists, that's what you want.
  5. campyguy macrumors 68040

    Mar 21, 2014
    Portland / Seattle
    OP, I'm a bit confused about what you're seeking. I don't own the same display you have, but I do own the same Sony headphones and I have no issues with them. You're not sharing everything about your configuration - wanting to connect the display via HDMI and you also have the headphone processor connected via HDMI. You do know that the processor has an HDMI switchgear built in, but it needs to be configured properly, although that's not likely your "problem".

    Your Mac has one HDMI signal to output to an HDMI device - if you've connected the processor via HDMI, that's it. DisplayPort includes HDMI, but if you've connected the Sony processor via HDMI you've essentially terminated the single HDMI signal there's nothing to output to your display. I looked up your display, and it has mDP and DP ports - so either you're not using a mDP or DP cable to the display or you've not related that you have other devices in your "chain", and I'm not going to speculate further about this.

    I'll offer what I have going on. I work in 4 locations, and use either the Sony headphones or a pair of Grado SR325e cans, and I bring both with me when I hit the road - the Sony's for movies and the Grados for music, and when I get tired of wires I'll connect the Sony headset. But, I use the headphone jack for both - did you know that the headphone jack on your rMBP also has an optical signal?

    I connect my Sony processor to the headphone jack on my late-2013 rMBP's headphone jack using an optical cable, and it works perfectly, with a tweak. The Audio Preference Pane needs to be adjusted - it supports up to a 192 kHz sample rate for audio playback when using the Toslink optical digital out port. To enable playback via Toslink, select "192000.0 Hz” under the "Format" pop-up menu in Audio MIDI Setup.

    Also, and don't laugh, when on the road I use a newer Airport Express and its optical out port. A friend of mine made fun of my AE, but I swapped it out for his Schiit Bifrost (a $350 DAC) and he didn't notice for the entire weekend - until I told him. Apple's Airport Express is pretty sweet, and includes a powerful DAC. Before you judge, read Ken Rockwell's breakdown of the latest Express's output (and comparison to a $3000 CD player, using 10-year-old dollars) - - he's got lots of graphical data and readout in that post.

    On the road, I'll connect my Sony processor to the Express's optical out and use Airplay during playback of my movies and some music - I'm pretty anal about my sound quality, and it's surprisingly good. This, coming from a longtime Grado and non-Chinese-made Sony headphone owner. And, I own a Bifrost DAC too...

    I know that the optical output is 5.1 and the Sony's have a virtual 9.1 output - but, that's the point, it's virtual. I, personally, can't tell the difference between virtualized 5.1 and 7.1 and 9.1 when the source material is encoded properly (I use Apple Lossless for my good stuff). Consider using the optical options you have available, and ditch the HDMI for the Sony processor and you'll free up a port for other uses. :D
  6. JTToft macrumors 68040

    Apr 27, 2010
    Aarhus, Denmark
    - It doesn't exist. And it's also unnecessary. HDMI 1.4 does 4K at 30Hz just fine.

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5 May 28, 2015