I got mine working good with just a 2.1 amp now. I just plug the power in the Raspberry Pi and from there it goes to the 7″ Touchscreen power with the gpio pins.
Now I have the HiFiBerry and I just solder the power wires to it. So power goes in the Pi and it gives power though the gpio plug and from the HiFiBerry power goes to the Touchscreen.
It all works with 2.1 amp USB power I have to it.
No color cube in top right corner.
I did have the color cube fading in and out one time with another USB cable and that cable seemed good. I am using a old USB cable and it works. So that may be it for others if you get this or the touch don’t work. It’s because not good power to it.