Bitmain APW12 1215b PSU auxiliary power circuit repair tips

The APW12 1215b power supply has two auxiliary power circuits, and their composition and functions are different. The first one is composed of a transformer and a thick film chip, and its function is to power the PFC chip, thick film chip and optocoupler. The second one includes the transformer, rectifier diode, auxiliary power chip and MOS tube, which will power the fan interface, control board, CPU chip and main power chip respectively.

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