I have q UE43MU7000 Samsung Smart TV from 2018. SmartHub apps do not load - they get stuck on "Loading..." message. I tried to reset the TV, or reset the SmartHub. Am required to enter a PIN, and get an on screen numeric keypad. Selecting numbers there does not input anything to the PIN 4 character boxes. Even using a classic remote with digits fails, as does an Android based virtual remote. I just cannot input any digits to the PIN, and so cannot reset the TV. What can I do?
I had the same issue and what ended up working for me was a manual pairing of the remote to the TV. I held the back button and the play/pause button down together for a few seconds to pair. Once that was done, when I hit the 123 button, a number pad popped up to enter the pin. While the rest of the remote had previously worked without the manual pairing, the 123 button did not until after. Hope this helps others.