Bitforce Jalapeno

Bitforce Jalapeno

Hello again. I’ve recently received 2 Bitforce SC Jalapenos in my mail. One of them worked, the other didn’t. I tried every configuration, cable, etc… it just refused to work (if you have the same problem read to the end, my solution involves the fan).

I received a RMA ticket from Butterfly Labs but didn’t want to send it back, so I tried to repair it myself by flashing it (WARNING: this will void your warranty).

Since a have a Raspberry Pi and don’t have a Avr Dragon flasher, I followed this tutorial:
http://randomcontent.wolfnexus.net/RandomSite/reflashing-a-butterfly-labs-jalapeno-with-only-a-raspberry-pi/

The bin image I used was downloaded from here:
https://forums.butterflylabs.com/jalapeno-single-sc-support/5849-help-jalapeno-fast-flashing-no-brain-activity-7.html

Well, it didn’t matter which image I chose it always failed with a “verification error” message, at different flash memory addresses. With that behaviour I arrived at the conclusion that the board must have a faulty power regulator so I

  • Disconnected the external power and used another jumper to connect the “pin 1” from the Pi to the “pin 4” on the Jalapeno JTAG. This gives the interface a 3.3V tension from the Pi.

I tried again to flash it with this new jumper connected (no external power) and the flashing worked!!! 🙂

I tried the new firmware and the cube now works. Even more, at 8GH/s it’s faster than the other one.

BUT, I had disconnected everything and was testing the board with just the cooler. As soon as I plugged the fan again (power it off when doing this) it didn’t work again. So now my conclusion is, either the power regulator or the fan is/are faulty.

I now have it out of the box in a cool spot and it works just fine, though very hot. 😉

No RMA needed! 😀 😀 😀

 

BFGMiner Jalapeno @8GH/s

BFGMiner Jalapeno @8GH/s

UPDATE:

I actually closed the cube now and it’s working. I forgot to tell you: I was in a hurry one morning and connected the fan without powering down the unit. I actually blew a capacitor but it still works so far. 😀 So flash away and don’t RMA.

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