The tv is not the object in this sentence because the tv is the one doing the act of disappearing. If the sentence were, for example, "I get rid of the television", or "I disappear the television" (although you wouldn't say that because disappear can't take an object), then the tv would be the object because I am the subject doing something to the tv.
Great explanation. Yes, I posted this question many months ago. Thankfully my grasp of particles has improved since then. However, you've shone a light on this from a different perspective for me and I'm now realising why I was confused back then: I was mistaking literal objects for grammatical objects. i.e. Physically speaking, a television is an object, but grammatically speaking, it's only an object if there is someone or something else to treat it as such.