Absolute scrap! HDMI port on the TV broken now! Hands off!

I bought this because of the Extension cable connection can be reached only with difficulty on the TV and plug so unplug and annoying is. I therefore wanted to plug the cable into the TV and it to bridge the HDMI cable to my receiver as 20 cm, and so more easily get to the port. Infected so ... Extension Cable to TV and HDMI from the receiver and voila .... black image! Thought ok there's something wrong. Verlaengerung away and receiver cable directly to TV ... black picture! Then the receiver HDMI cable unplugged and another try ... black picture! After Bluray player with other cables to the same port as before the receiver., .. Black screen! In other words, to me this Extension Cable has just wrecked one of the two HDMI ports on the TV!