We use a LG Service Remote (Can also be done from a computer using a serial cable - check with Nony as how to do this) and adjust White Balance Values in the Service Menu. (SM)
Please note: your THX, Expert 1 and 2 should have come with Factory settings for the CMS and IREs. Write these down before changing any values.
If these are all Zeroed Out, then something has happened to them. Usually the LG 55LH90 and 55LHX came with Factory calibrated settings in the THX, Expert 1 and 2. The LG 55LV9500, came all Zeroed out, excepting the SM White Balance that appeared to have been calibrated. (All our sets had different values in the SM White Balance.)