Bitmain Power Supply Repair - Part 1: How to Diagnose Issues on an APW9 PSU for Antminer

In this Bitmain power supply repair video, we show you in detail how to perform an initial diagnosis of your Bitmain APW9 power supply for Antminer. Try to follow this Bitmain power supply repair procedure only if you are experienced. The charge remaining in the capacitors can cause severe contact discharges. Watch our next video to learn how to repair and replace your Bitmain APW9 PSU components. Part 2: --- This unit failed to output the appropriate voltage We can diagnose and repair this PSU by feeding it 110V instead of the required 220V On a working unit, we should see the fans spin when plugged in The voltage across the 6 pin connector of the unit should read 12.3V The positive probe of the multimeter should touch any of the bottom pins, and the negative probe should touch the pin above it. In this case, we&reading 0V, this indicates the fan spin issue is not due to hardware failure Then, we need to read 21V across the units output Since this PSU is not connected to its miner, we have to bypass the control board to get power to the output. To do so, we need to short the last two pins of the control board connector Here, we&using a push button switch as a fail-safe. In this case, we&reading 0V, which means this circuit has critical damage To further diagnose this unit, we need to disassemble it We unscrew the case from the board and unplug the fans The next step is to do a visual inspection of the board At first glance, we see this unit has a damaged resistor at R32...