Alan for Model Number SMH9187W I have no display lights on microwave. I checked the two fuses on small board.....they are good. I would like to test to see if there is power going into the main board but don't know how. I have a tester Can you tell me which wires to check and what the voltage is ac or dc? I have power at a black/white plug that is on another smaller board above the main board...120v ac. I hesitate to purchase the main board until I'm sure that is the problem. Can you help me diagnose this? Thank you, Alan
Answer Alan, You will want to check the 2 pin connector which should be the P1 connector across both terminals and there should be 120 vac at that point. If there is then the the main board is getting power and this will most likely be the issue with the unit. Read More... Answered by AppliancePartsPros.com | Wednesday, November 2, 2016