I own my LG 43UD79-B since about a half year. Using it mainly as PC-Monitor in 4K-Resolution with SAT-Receiver-Picture shown in a PIP-Window:)
My problems with the 43UD79-B: From time to time one more of it´s HDMI-Inputs lost it´s ability to accept "4K-Signals" from my PC (Graphic Card HIS ATI...