BitcoinBrabant on Nostr: The Noderunners were so nice to directly analyze the problem with this type of Leicke ...

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:

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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.

quoting note1vy7…ym8n

RECALL 🚨 ‼️ LEICKE ADAPTERS for bitaxe gamma. Over the past 1+ year we have sold and used Leicke adapters without an issue and they have proven to be great with the Supra, having an amazing track record. In the past weeks we’ve seen more and more burned U3 chips on the gammas. Always with the 6A 30W 5V adapters by Leicke. Never with our own manufactured bitaxe branded ones.
In general after months of proper operation the client updates the firmware or repowers the bitaxe. Or sees that the bitaxe has stopped hashing. After plugging the adapter back in the U3 chips burns. This in general happens after many weeks/months of operation.
Since we’ve seen more and more of these issues we’re recalling all of our hundreds of adapters to replace it with our own production ones, that have not seen any problems.
Now the difficulty adjustment is here for us, we delete all client data after shipment. So please spread this message if you know people who ordered a gamma with us and have them do the following.
Check if you have a Leicke 30W 6A 5V adapter (other Leicke adapters are perfectly fine for more than a year, so don’t worry about them). If so go to our website and use the contact form.
Send us your order number, e-mailadres you want us to use for your shipment and the shipping address. We will delete the email coming through the contact form directly after shipment.
We hope to be able to keep as much hash as possible online through this recall. Very sorry but after many discussions we were always sure the Leicke was the best product before we produced our owns. Now it became clear after long term running its not the best for the job. We’re sorry we failed there and will keep improving. This will cost us a lot, as we’ve shipped hundreds of these adapters… hope we are here to see a long lasting relationship with our clients.