HDMI keystones are also available for digital signage applications and large conference facilities with many displays that are fed from a central location. HDMI faceplates give a clean, finished appearance and have a female connector on the internal side, making termination easy. HDMI cable is considered low voltage so you can install it inside a wall. The same cables work fine to transmit 4K Dolby Vision or HDR from my AppleTV and my 4K Blu-Ray player through the same receiver. ![]() The cables aren't the issue the mini's HDMI output is. I have to use an active miniDP to HDMI adapter to get a stable picture. If I use the mini's HDMI output, I get frequent dropouts. I have my 2011 mini connected to a 2018 Sony AV receiver that outputs to a 2017 4K Sony TV. My next job will be to replace the HDMI wall sockets with simple hole-in-the-wall sockets, so that I can pass a single cable from the Mac to the TV behind the wall, with no sockets or other connections required. I also guess that the USB-C hub provides an even weaker HDMI signal (it is a non-powered hub). And heat seems to make it worse (this Mac gets very hot at times!). So my conclusion (guessing) from all of this is that the HDMI signal from the Mac Mini 2018 is weaker than from the the 2012 model (with miniDP/HDMI adaptor), and it doesn't play nicely with passing through a string of sockets and cables. The only downside is that I have an ugly thick cable going across the front of my wall, to the TV on the wall, which otherwise has no other cables visible. Now, I have cabled the Mac Mini's own HDMI socket directly to the TV, without the wall sockets (and the behind-the-wall cable), and it works perfectly. I could not get this to display anything on the TV at all. So I then bought a USB-C hub, with HDMI (and everything else). With the 2018 model (and no adaptor), it has been horrendously unreliable, with the screen frequently dropping out for a few seconds, and sometimes (during hot weather, I eventually realised) it would drop out long-term. This same arrangement worked find for my old 2012 Mac Mini with a mini DP to HDMI adaptor. The TV is plugged into an HDMI wall socket, and the Mac's HDMI port is cabled to another HDMI wall socket, and of course, the two wall sockets are connected behind the wall. On a brand new Mac Mini 2018 model, I've been having all sorts of trouble with HDMI to my cheap AKAI 55" TV screen. Hope you get them sorted because it sucks when a tool isn’t up to performing its task. I should be seeing him again soon and plan to follow through regarding his experiences since. I suspect there’s something funny with his hardware or software but it’s not my circus and I haven’t done any deep dives into his issue. He was quick to blame my cable because his computer was “brand new” but that setup has worked reliably since with every device I’ve thrown at it, before and since, including other 2018 MB’sP and my iPad Pro. Last November a presenter at a local camera club salon (using a 2018 MBP- virtually “out of the box”) had an issue similar to what you describe. Which isn’t to say that I haven’t seen any issues, just that they’re not widespread. Your issue may be the adapter you’re using or with your computer specifically. (I’m the de facto “AV guy” for several local organizations as well as being “the guy you call” when presentation tech goes wrong in our Community Room/Auditorium at work. Same for the additional 5-6 2016 models (and if we expand the universe to include ALL USB-C equipped MBP’s I have in my circle, 20-30) that I connect to projectors and monitors on regular basis. There’s something in your environment specifically (and I admit, it could be your computer) causing issues.Īnecdotally, I haven’t had any issues with my 2016 15” using either a USB-C > HDMI cable or conventional HDMI cables and an ANKER video adapter. ![]() In my experience it’s generally reliable with what you have now - or at least with that generation of MBP. ![]() I understand that this doesn’t provide any real help but I think your questions of reliabily of the video output are misplaced.
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