I managed to get into the service menu without proper knowledge about it and change the values of the tuner field (and some other fields) without noticing it.
I managed to set back some of the values by guessing from the info panel, but there is one remaining. Would you please so kind to get into your service menu and post me the default value of the tuner field?
The full model number of my set is: UE46F8000STXXU
Many thanks,
nagno