Michael S York , ME September 10, 2016 Appliance: General Electric Microwave PVM1970SR1SS Ge Microwave Pvm1970sr1ss: Ge microwave hummed whenever the door was shut. How to replace Pcb Main Asm. I followed the instructions from your website: Unplug the power Remove the top bezel Remove the front panel Disconnect wiring and mark the connectors Detach the old control board Attach the new control board attach all wiring Install the front panel install the top bezel connect the power 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes