How to restore the factory settings of non-smart TV?

Non-smart TV can't restore the factory settings, because non-smart TV, that is, traditional TV, has no ecosystem platform and is only equivalent to an image display, which receives content display through a wired interface.

It has no system, which is equivalent to a desktop computer without a host monitor. We can update and reset the host system, but we cannot update the monitor. So the traditional TV as a monitor can't be set up in the factory. We can do some hardware cleaning, such as dust removal.