Recently I bought an hdmi to rca cable. This cable has a purple, green and red connector unlike thr red, white and orange regular cable. I try it and didn't work (I have to admit that I was guessing wicht when where, exept for the red one). Is this cable compatible with my tv (red,white,orange)? Does anyone know wicht is wicht (video, audio L&R)? I write to the seller that told me to "tubeit". I found no help on youtube. Can you help?