Tv repair. Sony KV20S10 Trinitron Color TV manufactered 8/1994 has only snow and no sound on all

Question

Sony KV20S10 Trinitron Color TV manufactered 8/1994 has only snow and no sound on all channels when turned on. After undetermined time both perfect picture quality and sound appear. If TV is turned off and back on same problem arises. TV operates with local antenna (rabbit ears) and problem started sometime after cable service was discontinued. Any ideas?? Thank you.