Quote from: Endikadija on Today at 07:08:48 PM

I have tried with a working MM board from a good known 841 and still the same thing. Maybe it can be a faulty hashboard, but why doesnt the other hashboards work? I think it is uncomon that all the 4 hashboards are faulty,what do you think?

Quote from: HagssFIN on Today at 06:32:59 PM

Hi,
it gives you the ECHU code 131073 in the cgminer API log.
I have explained that particular code here:
https://bitcointalk.org/index.php?topic=5325107.msg57013711#msg57013711

It's usually a sign for a faulty hash board.

But if you are sure the hash boards SHOULD be ok,
it can also be a faulty MM board (control board).

Do you have another MM board to try with this unit?

Was it ever working?
Did something happen?
Since you have another miner can you swap the other hashboards into this unit?

Can they all go bad at once by itself? Doubtful, but I had a 721 have everything go bad when the power supply shorted out.
There was no physical damage that you could see on the unit itself and it booted up fine once I replaced the PS, but it never mined again.
It was old at that point and I didn't put that much time & effort into testing, but looked like the same issue you are having.

-Dave