4K content through HDMI but no 3840x2160 resolution on Toshiba 55ZL2

Dear,
I bought a Toshiba 55ZL2 and trying to hook up my PC.
For some reason it does not show the 3,840 x 2,160 resolution.
All HDMi ports should be version 1.4, but for some reason it does not work.
Any idea's?
Kind regards,
Chris

Bob, completely agree; keep in mind that the zl2 (55x3) was designed in 2011, released q1 2012, before hdmi 2.0 had been set. Hdmi 2.0 allows for a single 4k input, where the zl2 is armed with a 36pin centronics connector and coupled with the thd-mba1 caters for 4k via 4x 1080p inputs, utilising 1/4 screen per input.
Logic suggests a hdmi 2.0 splitter to 4 separate hdmi cables may also work, but there's more to it than this.
It's also perhaps logical that once we take apart the 36pin connector you could identify the 4 segments and create a cable that facilitates 4 inputs (then buy a PC Card that performs output to all 4 to give a combined UHD display, there are a couple out there like ATI fire pro v7900 that offer this).
The thd-mba1 is near on 2k in japan! And is not hdcp compliant.
This reminds me of the days when 5.1 first came out and Amps that were 5.1 ready required DVD players that had a built in 5.1 processor and 6 cables to connect each audio line to amp! Mine cost over 1k back in the day, same setup 12 years later is under 100!
I do not, however, agree that it was never toshibas intention to market this tv as a uhd playback tv! If that's the case then there's been a vast level of misrepresentation in shops with demo 4k video and think tosh should have been more honest with the need fir an external uhd device that due to costs might not be released...

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