The Video Dead (1987)

An unlabelled crate from an unknown source is delivered to a house in the woods. The homeowner unwisely accepts the delivery, only to discover it contains a TV set that starts spewing giggling zombies all over the place. When a new family moves into the now-abandoned house, the son discovers the haunted televsion and is soon told what he needs to do to send the zombies back where they belong. Knowing and doing, however, are two very different things, and the zombies are not likely to go quietly.