I've had my 49inch 2019 Samsung Frame for about 18 months. For majority of this time i have had it connected via Freesat with no issues. This uses a Sky dish shared with my neighbour.
Recently all channels said no signal. I have re-tuned many times and whilst it says it has found 140+ channels most of them remain blank (no signal). ITV is an exception - this has perfect picture and is fine. This suggests to me it is not an issue with cable or dish (as otherwise i wouldn't get good picture for ITV?). There are a few other channels with pictures i can add if relevant.
Also, when entering any postcode during the tuning process it says invalid.
I do not believe the issue is the dish as my neighbour still receives Sky and Freesat (on 2 different TVs) with no issue.
I had a simular problem with my free view as well. It found the channels but didn't display no pictures, was very frustrating... Turned out it was something to do with the connection in the wall. (Built in aerial)