When the voltage in the DC-DC circuit of the Antminer L3+ hash board is abnormal, first check whether the PIC voltage value is consistent with the DC-DC output voltage through the tool print information; if not, you need to replace the low capacitance around the LM27402SQ. Details: https://www.zeusbtc.com/manuals/Antminer-L3-plus-Hash-Board-Repair-Guide.asp#AntminerL3+ #hashboard #DC-DC #circuit