I have the same problem and I had someone hold down the outside door button. I could hear a clicking in the speakers and I noticed smoke coming out of the 37821-1A board - the one that has a place where the chime plugs in. It is called "chime out". On the diode and chip side the board has the following number 37821-2B. I an going over to radio shack and see if they have a board. If not then I will order one on line. Will let you know what happens.