I have a new EU43TU7100. I use an (old but working fine) Humax Foxsat-HD Freesat box but can't get a picture from it on either of the HDMI ports. As I play around with the settings I variously get an all green screen, an all black screen a working picture which goes all black after about 10 seconds or an all black screen but with sound. I have run the TV's diagnostic procedure which tells me there's nothing wrong with the cable. I have managed to get the TV to recognise the external device such that it can change channel (channel number is displayed on the Humax box). The TV works ok via internet. I have tried setting the Humax to 720p and 1080i (it doesn't do 1080p) and various formats of screen width.
Any ideas, even as to whether it should work or not with this type of input?