I noticed that TVs nowadays come with an HDMI connector for their video (and audio) input. Could a computer monitor with speakers serve in place of the TV?
I suppose that leaves the problem of not having a remote control for the 'TV'. However, if the inputs are from a cable-tv box or a media-box, they should have their own remote controls anyway.
Is there some simple reason to avoid doing this, which I overlook because of my ignorance?