Random Shutdowns: Should the product connected to the power offer is shutting down randomly, it may be a sign of a malfunctioning power source. -Test the main winding of switch mode power transformer with flyback tester. Check out also the flyback Most important winding, b+ coil winding and horizontal yoke https://power-supplies-refurbishm89999.fireblogz.com/61703738/everything-about-power-supplies-refurbishment