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and the power LED is off or stuck (not blinking through the boot pattern)
5 is the refreshed hardware revision with improved USB stability and off-line programming support
Preheat the board to 150–180°C on a heating station
5 software family
Dead controller produces no drive
Whatsminer P21D Switching Power Supply PSU 3300W s11 and the power LED isWhatsminer P21D Switching Power Supply 3300W Replacement PSU for M20S, M21S, M30S & M31S The Whatsminer P21D is a 3,300 W switching power supply for the M20S (6270 T), M21S (5058 T), M30S and M31S. It accepts 200277 VAC at 50 60 Hz (20 A max input), delivering a primary 12265 V rail plus a secondary 12 V 10 A auxiliary rail for the control board and fans. The C19 plug and 6 pin output provide a direct drop in replacement without wiring modifications.
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