hdmi problems

need a bit of advice. i connected a 2 way hdmi splitter cable to zgemma h2s so i can watch 2x tvs from same receiver both at same time or both independently but did not seem to work. Could this cause a problem with hdmi port on box or maybe just a faulty splitter? if so any suggestions how to solve this. first tv is 37inch and on 1.5m cable and 2nd tv is 24 inch and on a 3m cable. thanks in advance.
 
Pin 18 on a HDMI cable needs +5Volts so I would imagine that by using a splitter that the STB is not capable of supplying the 5 volts to both cables.
 
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