Even a simple "map the HDMI pins to dual Cat5e/6" adapter like this one still mentions that it's powered (though in this case by pin 18 of the HDMI jack), so I'm not sure it'd do what you want.

Specific signs of hardware damage on the PS4 HDMI port are as follows: Bent Pins – this is a prevalent issue among PS4 owners. It’s often the result of frequent plugging of the HDMI cable in ...

Not content with Sony's official teardown of the PlayStation 4, iFixit has started work on its own thorough analysis of the console's internals. The dissection isn't complete yet, but early ...

PlayStation 4 Release: What You Should Know Here’s what to expect if you haven’t picked up Sony’s next generation console yet.