Test again but with some USB mouse. Does that work?
I did read reports about 400r issues so I skipped for the K400 Plus. As expected not all function buttons work but I don't own your model. If the USB mouse works try the https://www.logitech.com/en-us/product/wireless-touch-keyboard-k400-plus
I just bought a Samsung 40" Class 4K (2160P) Smart LED TV (UN40MU6290) and tried finding a compatible keyboard and mouse.
NO such luck!
I bought a Logitech k400r. The touch pad and function keys don't work.
I've tried downloading SetPoint on my PC and key board works fine but still not on TV?
I'm thinking of trading everything out for a different TV if anyone knows of smart TV w known compatible keyboard and mouse?!!!