The backlights of LOGO!TDE are set by the following M-flags in your LOGO! program:

M26, M30, M31

If you don’t use the named flags and the backlight of LOGO!TDE is set, I can only assume your part is defect.

Hint:

If you use the keys of LOGO!TDE the orange backlight is set for a short time. In this way it’s easier to read the texts.

But there is no feature for “orange-red-white consecutively” backlight setting.