I have a Seiki 39 SE-UY04 connected to my Mac pro (late 2013 model) and it has been working great until the update today. Now I only see low resolution selections for this monitor and no longer have 3840x2160. Any ideas?
As far as I can tell this is an early 4K TV and it might only support HDMI 1.4a. As such it would support 1080p at normal refresh rates, i.e. 24p, 50p, and 60p but only support 4K at 30p at best.
It sounds like Apple may have decided that 30p is inadequate and chosen not to list it as a choice anymore. It is sometimes possible to view hidden resolutions by holding down the option key in System Preferences -> Displays and then being able to access additional options.
Personally I regard any 4K display with only a HDMI 1.4 interface instead of a HDMI 2.0 interface as being a 'fake' 4K display.
Whilst so far I have not found definitive technical specs for this TV listing which HDMI version it supports I do know some TVs which like this have multiple HDMI ports (it has three) might only support HDMI 2.0 on one and HDMI 1.4 on the others, so check this or try the others.
I did find this - https://www.amazon.com/ask/questions/asin/B00DOPGO2G which seems to confirm it only does HDMI 1.4a and not HDMI 2.0 (and not Displayport).
As far as I can tell this is an early 4K TV and it might only support HDMI 1.4a. As such it would support 1080p at normal refresh rates, i.e. 24p, 50p, and 60p but only support 4K at 30p at best.
It sounds like Apple may have decided that 30p is inadequate and chosen not to list it as a choice anymore. It is sometimes possible to view hidden resolutions by holding down the option key in System Preferences -> Displays and then being able to access additional options.
Personally I regard any 4K display with only a HDMI 1.4 interface instead of a HDMI 2.0 interface as being a 'fake' 4K display.
Whilst so far I have not found definitive technical specs for this TV listing which HDMI version it supports I do know some TVs which like this have multiple HDMI ports (it has three) might only support HDMI 2.0 on one and HDMI 1.4 on the others, so check this or try the others.
I did find this - https://www.amazon.com/ask/questions/asin/B00DOPGO2G which seems to confirm it only does HDMI 1.4a and not HDMI 2.0 (and not Displayport).
Try using the the free Display Menu app from the Mac App store.
I too did not have the 4K resolution available from Apple Display Preferences.
Grant Bennet-Alder wrote:
Consider buying a high-quality adapter from Mini DisplayPort (ThunderBolt subset) to HDMI 2.
Appropriate adapters will also advertise they are "4K" capable. High-speed HDMI-2 cable will also be required.
If - as seems to be the case with this display it itself only supports HDMI 1.4a then no matter how good a Mini Displayport to HDMI 2.0 adapter and HDMI 2.0 cable you use it will still only support HDMI 1.4a.
Consider buying a high-quality adapter from Mini DisplayPort (ThunderBolt subset) to HDMI 2.
Appropriate adapters will also advertise they are "4K" capable. High-speed HDMI-2 cable will also be required.
For now I am able to get by with using SwitchResX but can only get it up to 18hz. but this is not ideal.
Unmarked cables usually only go to 1080p and some to extra wide. Cables marked High Speed will generally get to 4K at not higher than 30Hz.
Correct, this is a 39" 4k tv. I have been using it for my main monitor for the past few years and love it. Work only, no gaming/video. I was using the same cable as before the update and have always had 4k resolution. Tried a new cable (unmarked) with same results. And have reset the nvram multiple times with no change.
Thanks for the reply, yes it is an early 4k tv and at the time I purchased it I think the price was around $319. At that time this was the best bang for my buck in wanting something more than a 1080p monitor. I bought this in 2015 with the sole purpose of using it as my main monitor for my mac pro. It has worked perfectly for my application up until the latest update. While I will admit that 30hz is not the best for watching video it has been just fine for my needs (programming).
You are quite right, John Lockwood.
I was popping in and out on this thread and lost sight of the ultimate goal: yes 4K, BUT at a reasonable refresh rate, please.
I agree that that TV will never have a very good refresh rate, even if you do manage to force it to "4K" resolution.
Was there ever a resolution (hehe) to this issue? I have the same SEIKI and it's a great monitor for surfing the web and RDP SSH etc. It's a shame the 10.14.4 update broke it. That's what I get for getting up early on a Sunday and deciding to be productive...
what interface and what cable to connect to the display?
Just tried it and still did not work. Only gives me options lower than 1080p
For info, the Seiki 39 SE-UY04 is really a 4K TV with onlt HDMI and and a VGA inputs. At 4K 30Hz is max refresh
Have you tried resetting the NVRAM?
Reset NVRAM or PRAM on your Mac - Apple Support
What HDMI cable are you using? The same one that got you 4K before?
Maybe the cable is degrading I have tried a unmarked HDMI and only got 1080p max.
No resolution yet, still working with Apple. Still using SwitchResX @ 18hz
Lost 4k resolution for external monitor after 10.14.4 upgrade.
