If a deed of trust or mortgage, with power of sale, is silent as to the place or terms of sale, or as to the character or mode of notice, a sale may be made at the courthouse door of the county wherein the land is situated, after condition broken, for cash to the highest bidder, after 30 days’ notice of the time, place and terms of sale by publishing such notice once a week for four consecutive weeks in a newspaper published in the county wherein said lands or property in said mortgage or deed of trust are situated.