Ok so if you have replaced the inverter and the main board was found to be good and no fans or compressor is running then the relay board that controls the staring of the compressor, fans and defrost system is bad and needs to be replaced.
Refrigerator Electronic Control Board
Part #:(###) ###-####/a>
it's listed as part #31 on the diagram below , just to give you an idea of where it's located:
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