Auxiliary power part of Antminer APW3+ PSU is also called standby power section, which is composed of thick film chips, transformers, diodes, and triodes. The main function of this circuit is to provide power to internal chips, fans, etc. Therefore, if there is no response after the power supply is turned on, you should consider whether there is a problem with the auxiliary power. This lesson will demonstrate the structure and testing of the auxiliary power.