Question No signal to Samsung 4K UHDTV through 50' HDMI cable

riffraff11235

Novice Member
I'm trying to setup a multi-display system at my internship, using 6 Samsung 4K HDTVs connected to a computer running 2 NVIDIA Quadro P5000 video cards with 8 DisplayPorts each. We just got the TVs mounted on Friday but haven't had electricians come in to do the actual wiring through the wall yet. We decided to test one of the TVs, so we connected it to the computer through a 50' HDMI cable through an active HDMI / DisplayPort adapter. The computer recognized the TV, brand and everything, and acted as if it was connected properly and extending its screen to it, but we saw no picture on the screen itself. We tinkered with pretty much everything trying to find the source of the problem and/or fix it: changing the ports on the TV and computer, connecting to a different computer, fiddling with the settings in nVidia's nView program. The only thing that "fixed" the issue was connecting through a shorter 30' HDMI cable. The problem is that we need the longer cables in order to connect all 6 screens to the computer all the way on one side of the room through the wall. I searched for solutions but pretty much the only suggestion I found was to use an HDMI extender or amplifier. Is this effectively the only fix? Any help would be greatly appreciated.

Some relevant information:

TV model: Samsung 75" Class JU6500 4K UHD Smart TV
Cable model: Dynex DX-HG507 50' 4K Ultra HD In-Wall HDMI Cable
Adapter model: Club 3D DisplayPort 1.2 to HDMI 2.0 4K60Hz UHD Active Adapter
Video card model: NVIDIA Quadro P5000
 

Joe Fernand

Distinguished Member
AVForums Sponsor
Content - are there six discrete feeds?

TV - always better to use Displays designed for the job rather than TV's (one to keep in mind on future projects).

HDMI - 15m (50') is on the edge at 1080p and simply too long for 2160p.

HDMI - Fibre HDMI is an option as are various HD over CAT solutions, which to choose may come down to how you plan to use the Content/Displays.

Joe
 

riffraff11235

Novice Member
Content - are there six discrete feeds?

We're planning to use NVIDIA's nView software to stitch together these 6 TVs into one display, so we need 6 separate feeds (I think).

TV - always better to use Displays designed for the job rather than TV's (one to keep in mind on future projects).

The guy organizing this setup mentioned that he chose TVs to cut down on costs.
 

Joe Fernand

Distinguished Member
AVForums Sponsor
TV's - it's a common mistake and can end up costing you more in the long term as TV's often lack key features you require in a signage situation.

Content/Layout - would be good to get a better idea what you are aiming for to give you better guidance on how to wire the system.

HDMI cable marketing - that you would have to ask the supplier/reseller, the Page you link to makes no real sense as you don't 'certify' 15m passive HDMI cables for 4K.

4K UHD - anything longer than 8m is a lottery unless you go Active HDMI, Fibre HDMI or HD over CAT.

Joe
 

DarkEntity

Well-known Member
There's no such thing as HDMI cable "versions." There's no such thing as a "HDMI 2.0 cable." The version numbers refer to the HDMI connections in your equipment. Your TV can have HDMI 2.0 inputs, but your HDMI cable is just an HDMI cable.

Even if you bought a High-speed cable when all your gear was 1080p and HDMI 1.4, it will probably work now with 4K HDR and HDMI 2.0a gear. So to sell a 50foot HDMI cable is perfectly fine for 720p/1080p etc, the labeling of "4k HDMI" is for the uneducated for want a better description, its similar to the marketing of the £100 quid plus cables advertising better signals etc...when as its a digital signal mostly a £2 cable will do just as good a job.
 

Joe Fernand

Distinguished Member
AVForums Sponsor
Let's clarify :)

There are no passive High Speed or Premium High Speed cables at 15m (50') - 8m is the longest you can find in terms of a Certified cable and even then you can still run into problems with UHD 4K.

Joe
 

riffraff11235

Novice Member
TV's - it's a common mistake and can end up costing you more in the long term as TV's often lack key features you require in a signage situation.

What kind of display would you suggest? Are there companies specialized in making these sorts of display setups?

Content/Layout - would be good to get a better idea what you are aiming for to give you better guidance on how to wire the system.

The TVs are wall mounted in a 3x2 array. The most likely use will be to use four of them in a 2x2 as a single main screen (to preserve the aspect ratio) and have the other 2 for displaying controls and other information. The two video cards will handle 3 displays each.
 

ChuckMountain

Distinguished Member
Yes there are companies that do this and they will supply what you want.

The challenge in doing it on the cheap is you tend to run into all sorts of issues, just like you have.

Pro displays and signage will already cater for things like long distances etc but it won't be cheap so it depends on your budget and what you are trying to display.

Also consumer tv can have issues with different colour calibration etc and all responding to the same remote control etc.
 

Joe Fernand

Distinguished Member
AVForums Sponsor
Displays - all of the mainstream manufacturers have 'Pro' divisions plus a few specialists.

Setup - happy to give you some guidance and potentially supply kit, drop me a PM.

Joe
 

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