Every time it quit, I unplugged the refrigerator and plugged it back in, and the main control board circuit breaker would trip at exactly 45 seconds. If you put your ear as close to the control box as possible, you could hear it. I unplugged the compressor and it still cut out. Not the compressor causing an overload. Unplugged each of the the fans. Unplugged the temperature control board. It sill cut out at exactly 45 seconds everytime I plugged it back in.

I dug out the main control board from underneath. It looked pristine. I unplugged and plugged back in all the connectors on the board a few times, plugged it back in and it's been running for 90 minutes. Remember you're working with low voltage boards in less than ideal environments.

Fixed a front loading washer the same way a month or so ago.

I had a friend years ago who bought, repaired and resold large lots of broken beepers. More than half tested fine after just opening them up and cleaning all the contacts with a stiff brush.

If you don't see any burn marks, it's an even bet that your broken appliance doesn't need that new board, you just need to clean the contacts. When it starts working, put a tiny amount of dielectric grease, silicone spray or even vaseline on all the pins, and that will keep moisture out of those connections so the problem does not return.