Reality Check: HDMI voltages

I recently replaced a Panasonic plasma TV with a Vizio UHD LCD TV and had problems with the video freezing and losing signal altogether and I used the same cables. The source is a Motorola set top box. I ended up moving the set top box closer to the TV and using a different shorter cable and it corrected the problem.
 
My point is that the only thing that I changed was the TV so maybe the old Panny was amplifying the HDMI signal or handling it in some better way than the Vizio.
 
Mike.
 
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