Same LG 27UDseries 4K monitors with different colors

[lucianothomaso]

I am trying to complete a triple 4K monitor setup with no luck.
LG 27UD68-P monitor is in the center. Left and right are two LG 27UD69P-W.
27UD68-P +27UD69P-W
This are the exact factory model numbers. The center monitor 27UD68-P is way brighter than the ones on the sides. Even the left and right monitors are displaying different color even if they are exact the same.
I messed with all the settings the UD69P-W monitors are displaying a yellowish white.
I went over and over the specs of this monitors and only difference I could find in between these models is that the UD68-P has the brightness at 350cd/m2 whereas the UD69P-W has a lower value 300cd/m2.

I would appreciate any ideas about how to fix this issue:
1. return the 27UDP69-W two monitors and get the exact older version 27UD68-P?
2. is there any way I can fine tune the monitors to match the colors. Mostly the whites and the blacks which are faded in the newer model.

 

[fleshconsumed]

First of all check display settings to make sure that all of your displays are using identical settings, in particular that they're using full 4:4:4 chroma, and that they all use identical dynamic range setting (full range vs limited). If that doesn't help calibrating would be the next best option if you have access to a calibrating device (borrow from a friend if you can). Now, theoretically LG 4K panels should be factory calibrated, they're advertised as such, so read your manual and see which mode is the factory calibrated one. If you're already on the factory calibrated mode, then obviously they're not calibrated the same. Your options are as I said, calibrate the monitors, or return and get the same model hoping that maybe the exact same model will be calibrated the same.

 

[lucianothomaso]

Hi fleshconsumed
I think I found the problem. After I bought the L/R monitors LG27UD69P-W I just jumped into testing connecting random cables Hdmi mixed with DP.
I have a custom built desk PC and the 6ft DP cables (provided) are not long enough. Today I received the 10ft ordered ones and went through all the "remodeling"
Right now all three monitors are at default and I still can't see no difference. At this point I would put the blame on the cables. Sooo weird! Right now I have all three new DP cables connected to a single gtx980ti and three 4K monitors, everything OK.
Thank you for your help! All the best!