I have a DVD/HDD recorder, type LG RHT498H, connected to this TV through HDMI.
If I switch on the recorder before selecting the source on the 37PFL6007 (updated to firmware 150.048.013), I get the message "video format not supported" ; I am obliged to cycle the TV or the recorder to get the things working together.
There is no issue if I first select the HDMI source and then power on the recorder...

No issue also, whichever is lit first, with the recorder connected to an "old" 32PFL8605 !
Tried also HDMI CEC, no success.

Any idea ?