Oven on range did not work properly

My oven bake element melted one day. I had my husband replace it and for a short while it worked. Then it quit but then our broil element would not shut off. My husband said that it might be the heat sensor. We checked here in town and that element cost over $80. Since we have order from Parts Select before we decide to do so again. When we received the heat sensor my husband replaced it taking out the original heat sensor. This did not work as the broil element still would not turn off. I call the repair man and I found out that the initial melt down of the bake element also effected the main circut board that had to e replaced.