How do I lock my samsung smart tv?

Maybe you have a user manual?

Maybe you can go to the samsung website and get the answer?

Invest in a lovely home vault where you can keep your television locked inside it:

how can i lock my tv not just one singal app but the whole tv

How i wish i know how. i am also looking for an answer. not just wireless. but also wired to router. This is really one bad thing about this kind of device. i mean it is an open door to any one can just login to. in PC it is easy. but this smart TV i have nothing to do but to disconnect the whole internet services.
sucks. please let us know if you get an answer from any one. thanks buddy

Get a house by yourself.
Lock all the doors n windows securely, with your TV inside.

hey i found a way. also easy. you need to block the TV MAC address via router security mac filtering. login in your router and go security and select mac filtering. before that you need to identify your TV mac address from networking tab. then select it to be as "blacklist" if you have the same router as me then submit. the time you want to use the use the internet you just remove that black list and you can access then back if you want to disable.
best wishes.