Quote from: TaggedYa on November 25, 2013, 09:45:43 AM

I am not sure this is the right place for this but this seems to be a catch all thread so here goes.

I have 2 late October Jupiters. One I was able to get to 550 with all cores running under 98.1 beta. The other has 2 cores on one board that will not work until 73C or 74C and as soon as they start the whole board shuts down (I assume thermal shutdown) so it only works at around 480.

I was living with that (not economically feasible to give up 480 hashes for 2 weeks to rma the thing just to maybe get another 60 or so).

Now the problem. I shut the full speed unit down for a few minutes to change locations and when I restarted it cgminer fails to start. The bone boots and I can tty into it. I can try to manually start cgminer and I get a "cgminer failed to start: Write Error".

I tried changing firmware. Cgminer will run on 98 but not on anything after and on 98 I have all die 0s dead.

Anyone have any clues?

TaggedYa

Trouble shooting wise.

Make sure all the power cables are correctly attached.
Do a hard reset on the device:

Quote

HARD RESET
The miner is equipped with a hard reset button. This is located next to the power
input on the controller board. To perform a hard reset on the miner you must
press the button 5 times consecutively, wait 5 seconds, and then press the button a
further 5 times. Please note that the miner will not restart.

Also:
From the KNC support page: https://www.kncminer.com/pages/troubleshooting

Quote

Underperforming Miner

If you have a miner that seems to be underperforming you need to follow the below instruction.

To verify if an ASIC board is broken or the performance drop is due to software issues please follow these steps:

1. Turn off and disconnect your PSU.
2. Open your miner case.
3. Unplug the flat ribben cable connecting one of the ASIC Boards (the circuit board that has the big fan on it) to the controller board.
4. Unplug the PCI-Express power cable from the ASIC board.
5. Ensure all other cables are connected properly.
6. Reconnect the PSU and power on the miner. Let the miner work for an hour to asses performance.

If the miner is now performing as expected you should install the latest firmware.

7. Turn off the power and disconnect the PSU, reconnect all the PCI-E and ribben cables.
8. Restart the miner and install the latest firmware.

Lastly, If you can isolate the bad board, then you can just return that bad board for an RMA and the miner can continue mining, you don't have to lose the entire miner and 480Gh/s just for one bad board.