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Help Connecting Late 2015 iMac to 4K TV? (Samsung 49KS7000)

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Ok.... I've got a late 2015 5k retina iMac and I've just bought a lovely 4k TV (Samsung 49KS7000), I wish to use the Samsung as an external display from the iMac if possible (mirrored or extended, doe… Read More
JamesClark1991 Avatar
7m, 3w agoPosted 7 months, 3 weeks ago
Ok.... I've got a late 2015 5k retina iMac and I've just bought a lovely 4k TV (Samsung 49KS7000), I wish to use the Samsung as an external display from the iMac if possible (mirrored or extended, doesn't matter).

I've currently got a Thunderbolt to HDMI adapter plugged into the iMac then a HDMI cable running from the adapter directly to the Samsung TV. This worked fine with my old 1080p screen but the Samsung TV has a massive amount of input latency. I notice the Samsung changes to 24p when I connect it to the iMac which is probably the cause of the latency I'm experiencing? If so is there a way to get the screen running at 60Hz instead of 24Hz?

I'm not sure about bandwidth limitations from Thunderbolt etc so I'm a bit stumped. I've tried changing the TV to 'game mode' and also tried labelling the HDMI input as both 'game console' then 'PC' neither of which had any effect on the issue.

Any help would be appreciated!
Other Links From Samsung:
JamesClark1991 Avatar
7m, 3w agoPosted 7 months, 3 weeks ago
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Best Answer
This looked like the right adapter, until you go to the manufacturers website and look at the product FAQ.

Why am I unable to set a 3840×2160 resolution at a 60Hz refresh rate from my MacBook Pro/Mac Pro (Retina, Late 2013 and later)?
A: Mac OS X/macOS has limited the 4K video output from their mDP ports to a maximum of 3840×2160 (4K) at 30Hz when using our adapter with an HDMI 2.0 rated cable and HDMI 2.0 compatible display. Some customers have been successful in achieving a 4K resolution at 60Hz refresh rate when using 3rd party applications, like SwitchResX, but we are unable to guarantee success.
source link

Probably best to go in-store, asking someone who deals with this on a daily basis, rather than spending another £20 on something that may or may not do the job.

Edited By: SUMMONER on Nov 27, 2016 16:19

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(12) Jump to unreadPost an answer
Responses/page:
#1
Sounds like the Mac is limiting you to HDMI 1.4, when HDMI 2.0 is needed to go above 24/30Hz.

I wonder if your Thunderbold to HDMI adapter might be the limiting factor. Both the 21.5" Late 2015 Retina 4K and 27" Late 2015 Retina 5K iMac are supposed to be able to output to a 4K screen via the Thunderbold port.

http://s25.postimg.org/flo5bqctr/sum_screengrab_11.jpg

Read more here.


Edited By: SUMMONER on Nov 27, 2016 02:03
#2
Also, on the off chance that it is just OSX that is being obnoxious, have a look here for manual overrides to the monitor settings.
#3
Checkout this website and download apps on mac AppStore, I hope this helps.....
#5
#6
Also, just to clarify I'm using a HDMI 1.4 cable

EDIT: Tried with a HDMI 2.0 cable, also doesn't work.

Edited By: JamesClark1991 on Nov 27, 2016 13:46: .
#7
JamesClark1991
Also, just to clarify I'm using a HDMI 1.4 cable
EDIT: Tried with a HDMI 2.0 cable, also doesn't work.

There's no such thing, the version numbers don't apply to the cables.

As Summoner says, it's likely the converter you're using.

Most DP 1.2/TB2 outputs don't support HDMI 2.0 dual mode so you'll need an active converter for 60hz.

Edited By: EndlessWaves on Nov 27, 2016 15:34
#8
This looked like the right adapter, until you go to the manufacturers website and look at the product FAQ.

Why am I unable to set a 3840×2160 resolution at a 60Hz refresh rate from my MacBook Pro/Mac Pro (Retina, Late 2013 and later)?
A: Mac OS X/macOS has limited the 4K video output from their mDP ports to a maximum of 3840×2160 (4K) at 30Hz when using our adapter with an HDMI 2.0 rated cable and HDMI 2.0 compatible display. Some customers have been successful in achieving a 4K resolution at 60Hz refresh rate when using 3rd party applications, like SwitchResX, but we are unable to guarantee success.
source link

Probably best to go in-store, asking someone who deals with this on a daily basis, rather than spending another £20 on something that may or may not do the job.

Edited By: SUMMONER on Nov 27, 2016 16:19
#9
I've confused myself, thanks for the help everybody really appreciate it!

Edited By: JamesClark1991 on Nov 27, 2016 21:29
#10
What is the verdict? Did Apple suggest an alternative adapter for your iMac?
#11
SUMMONER
What is the verdict? Did Apple suggest an alternative adapter for your iMac?

I spoke with Apple online via live chat, it took the representative about 15minutes to realise he didn't know what the solution was.

However, I thought I'd try the Thunderbolt to HDMI 2.0 adapter you linked above just as a last resort before giving up. I Amazon Primed it (as they're great with returns) and it arrived today, I've literally just hooked it up and it works straight away!!

I now have my 2015 iMac using the Samsung 49KS7000 as an extended display at 4K 60Hz. The TV shows 60p using the"info" button on the remote and I've watched some Doom videos on youtube at 60fps to confirm it's correct (which it is).

Thank you for the help, I would never have thought about the old thunderbolt adapter's HDMI socket as being the bottleneck.

Got there in the end :-)
#12
JamesClark1991
I spoke with Apple online via live chat, it took the representative about 15minutes to realise he didn't know what the solution was.
There is a shocker. The person responding on chat probably only ever used a Mac during their induction day and works purely off the Apple knowledge base. It is always best to go in-store where staff are able to tinker with the Macs on a daily basis.

I am glad the generic adapter did the trick for you.

Edited By: SUMMONER on Dec 03, 2016 05:22

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