Put a $10 RC0410
hard start on it and see if it runs. Usually if you have a hot relay a hard start will bring it back to life. I say usually, it doesn't always work, but for $10 it doesn't hurt to try. I have one with a 110 cord hard wired to it for this purpose, reviving comressors. It works well on the Brazil made RU compressors.
The little circuit board is the defrost controller. If the fans are running and compressor is not, that particular board is NOT the problem. Try a hard start.