Power was out and when it came back on, the fridge would not work. No lights, no display on the temp panel, no compressor coming on. I tested the main board and did not find any voltage to the inverter board. The inverter board LED is also not on.

I verified 120v on the input to the main board. Looked at some YouTube videos and others had replaced the main board to fix. I ordered a board, installed it and no change. Ordered a second board and it arrived today, installed and still nothing. I find it hard to believe that I have had two mad boards I am not sure.

How do I test to verify the main board is in fact bad?

Thanks