I watched this when I was younger so I apologize for lack of information.
I remember this being a somewhat old movie. It started with these two kids going to what I think was a relatives, maybe grandmas house? Something with the TV happened, and I think they were brought to this different land/world through the tv, if not then it was the relative.
This different world had what I remember was a large factory. Alien or robotic like creatures inhabited it, and a core memory I have of this movie is this large blob like creature being in an area of this building. I do not remember how it ended, sadly, only that they did end up back home.