Shocker (1989)

Mass murderer Horace Pinker was put to death. Then he really got mad.

After a series of unusual dreams, young football star Jonathan Parker captures serial killer Horace Pinker, a diabolical television repairman responsible for the deaths of several families. Pinker is sentenced to die in the electric chair, but the execution goes awry and more people are mysteriously killed. Jonathan realizes that Pinker has used black magic to transfer himself into electricity, able to travel through power lines into homes through television sets. Despite the skepticism of his police detective father, only Jonathan can track Pinker down and destroy him once and for all.