UHD setup not working UH031 error

[AshPion]

Update:

I decided to purchase a 15m HDMI cable 4K UHD computable to test a direct connection between the Sky Q box and Samsung TV. I was able to successfully change to 2160p with ease and then when I transferred back to the splitter setup the picture went but I could hear the sound still. Tried a few different EDID settings in case that helped with the picture but still just a black screen with sound. Interesting sometimes the sound does disappear and then comes back so it must be struggling with something.
I'll take that as progress I guess, I just now have to figure out if the splitter is at fault or something else. 
I think I will have to try a different brand splitter perhaps to see.

It is confusing because the hardware setup should work for this. I have 4K HMDI cabling everywhere, 4K splitter and 4K TV. 
I jist keep getting that error message when selecting 2160p on the Sky Q box settings. There is obviously a handshake issue or something. 

[Chodley]

Can the "4K" splitter handle 10bit @ 50Hz (and 60Hz)?

[AshPion]

Yes, it claims it can handle that. 

Labgear 4-Way HDMI v2.0 18Gbps 60m Extender over Cat 6/7 4K 60Hz HDR10 Dolby DTS

[BenJoBanjo]

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@AshPion wrote:

Yes, it claims it can handle that. 

Labgear 4-Way HDMI v2.0 18Gbps 60m Extender over Cat 6/7 4K 60Hz HDR10 Dolby DTS

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It'll be the length of the HDMI cable that's the problem. Anything longer than 3 metres can and will cause issues with UHD signals. 

If you need a cable of 15 metres in length then it'll need to be a fibre optic HDMI cable such as this one. 

[Chodley]

It sounds like it converts it to cat6 and he said the 15m cable worked without the splitter.

does it do 4k AND 60Hz AND HDR all at the same time? Some tricksy specs out there sometimes.

is it running over cat6? Could you try cat7?