Xbox button RGB switches back to white after setting a colour

Have a look in console settings and check that auto detect is on in the display settings, set colour space to RGB and reference level to standard, it could be the xbox is trying to display a resolution or colour space that is not supported by the tv

apart from the elite series 2 controllers, all consoles and controllers have one led which is white, these are not RGB led setups and therefore the colour cannot be changed.

Check all of your reference levels in System Settings \ Display are set to normal and that HDMI Colour Space is set to RGB.

Y CB CR is an analogue colour space and narrower than Full RGB. If your TV supports Full RGB, then that's the setting you should use. If not, then it won't make any difference.

This is what it says about the pixel count.

Adjust display settings.

Colour depth

Colour depth is the number of bits of colour data that are used to display each pixel. True colours use 24 bits of colour data to represent the three RGB colours. If you know that your TV supports Deep Colour, you can select a higher colour depth.