The Noderunners were so nice to directly analyze the problem with this type of Leicke adapter. This is the first test run, we will do more to verify. Thanks for the direct proof of work!
Here’s the English translation:
---
sawed open his power supply and performed some measurements.
First of all, it is a flyback switching power supply.
1. The output capacitors are blown (C8 / C9 3300uF 16V, 1500uF 16V) - NOT OK
2. The output diode MBR4045CT (dual diode) - OK
3. The primary MOSFET (7N60) is shorted between Drain and Source - NOT OK
4. The snubber circuit, which is supposed to protect the MOSFET, consists of various resistors, D3, and C3. D3 is an IF107 fast recovery diode, which is OK. C3 2J222J (2.2nF) measures 2319pF - OK
5. The resistors mentioned above are fried (open circuit, OL) - NOT OK
Conclusion: The snubber that is supposed to protect the MOSFET is poorly designed, likely due to low-quality resistors or similar issues. As a result, the MOSFET is not protected, leading to large voltage spikes in/to the flyback transformer. This causes a higher output voltage that the capacitors and the Bitaxe cannot withstand, resulting in blown capacitors at the output and a blown Bitaxe.
To add some strength and certainty to this, I would need more defective power supplies to check if they all indeed have the same problem, confirming that this is actually the issue causing all the Bitaxes to fail.