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The general power supply board has three voltages, 12V, 5V and 3.3V, you either install three, but also corresponding to the same power, and support the operation response of startup and shutdown, can automatically cut off the power supply of 12V and 5V.
An electrical power chip that is broken cannot be replaced by a transformer. Transformer output is alternating current, need to be equipped with rectifier filter voltage regulator to replace the power chip to work normally.