When you are using internal 1D LUT features of LG (the service menu white balance settings are bypassed). The color temp you see at SM, are affect all TV modes (SDR/HDR/DV etc.).
When you are not using internal 1D LUT, then SM WB + normal menu WB, combined are used.
When you will upload only 3D LUT also, SM WB + normal menu WB, combined are used.
If you upload 1D + 3D LUT, SM/Normal Menu WB are bypassed.
The procedure for service crew is described more in older models SM manuals of TV's 2015/2016/2017. While I had them, as it was 2019 thread here, I have upload only the 2019 versions, but it has to do with process of service technicians.
For consumers/only expert users, its recommended instead of adjusting normal TV menu White Balance settings, to adjust only the White Balance values of color temperature from inside the TV's Service Menu only. The reason for that is because the normal menu White Balance settings combined with White Balance of Service Menu settings work as an offset from the native panel response, and when you have active two controls which are performing the same job, this can make the internal processing algorithm more complex, so it's a better idea one White Balance menu to be used only to adjust from native panel's response and not apply adjustments from both menus (normal TV + service) the same time. Performing only Service Menu White Balance adjustments to pre-cal 100% White only, it will provide cleaner picture with smoother gradations.
This procedure can be used from LightSpace or CalMAN user which will bypass doing 1D LUT profiling (with LightSpace ) or 1D LUT AutoCAL (with CalMAN), as we have find out that it provided better end results, visually but also proven with measurements.
For White Balance calibration using Service Menu, there is a setting 'Test Pattern' with '100IRE', '80IRE' and 'OFF' as options. The 'IRE' selections will display an internal generated full field pattern, but these patterns will bypass a lot of signal processing steps, we don't want this to happen, for that reason select 'OFF' and use a 100% White pattern with 10% window size generated from your HDMI input.
LG is still incorrectly naming the RGB Balance controls as 'IRE', a term which means voltage of the signal in analog world, as used in CRT's before 20 years. They should be renamed as '%' in digital world.
White Balance settings of 'Warm' in Service Menu will adjust the 'Warm 1, Warm 2 and Warm 3' preset of Normal TV Menu.
White Balance settings of 'Medium' in Service Menu will adjust the 'Medium and Warm 1' preset of Normal TV Menu.
White Balance settings of 'Cool' in Service Menu will adjust the 'Cool' preset of Normal TV Menu.
LG is pre-calibrating to their factory these service menu White Balance color temperature modes using a 80% Gray pattern with 6500K for 'Warm', 9300K for 'Medium' and 11000K for 'Cool'.
When you will adjust a specific color temperature mode from Service White Balance Menu, these adjustments will affect all Picture Presets with SDR, HDR and Dolby Vision modes, when you will select that specific color temperature mode from the normal TV OSD menu.
Adjustments of Service Menu White Balance Menu will be bypassed when you will use internal 1D LUT Reset or when you will upload a custom 1D LUT correction.
Use the EZ-ADJ button of Service Remote to access the LG OLED TV Service Menu, it will ask for a password, type '0413', navigate to '12. White Balance', and select the color temperature you want to adjust.
If you want to adjust for example the 'Medium' of Service Menu, start by setting the default 192 value to R-Gain, G-Gain and B-Gain and 64 value to R-Cut, G-Cut and B-Cut controls.
When R/G/B gain in the OSD is at 192 value, it means that the panel works at its Full Dynamic Range. In order to prevent saturation of Full Dynamic range and data, one of R/G/B channels need to be fixed at 192 value, for pre-calibrating the White Balance, lower only the other two channels.
To this menu, don't press the RESET button, it will delete the factory value stored to main board and it will display some letters with red letters to the main SM screen. (it will not harm the TV, just if you send the TV for repair, they can see that you deleted the factory values, where its used automated software and patch generation/meter to pre-cal the WB).
I have plan to update with picture about this, I will post a link.