I ordered one cable and tried it with SNES and GameCube (PAL) but didn´t get any signal. I contacted ZedLabz and they send me new one that worked with SNES using one of my 3 different TV´s. I tried both cables with 3 different screens and two different consoles but only second cable worked with one TV.
I got many tips and lists to check and everything is just like it should be (resolution, console models etc) but still nothing.