Antminer U3 dropped hashrate + lots of HW errors

[Piu3344]

Hi all,

I have my Antminer U3 running for about 4 weeks now. I realized that for the past week the avr. hash-rate has dropped from 62 GH to 48 GH.
Plus I get a lot of HW errors ... Restarting cgminer doesn't help much ...

 cgminer version 4.9.1 - Started: [2015-03-03 08:22:22]
----------------------------------------------------------------------------------------------------
 (5s):42.58G (1m):46.48G (5m):47.52G (15m):47.76G (avg):48.16Gh/s
 A:1529100  R:698  HW:18027  WU:665.0/m | ST: 2  SS: 0  NB: 244  LW: 3390860  GF: 0  RF: 0
 Connected to eu.eclipsemc.com diff 68 with stratum as user i_worker
 Block: e88afd87...  Diff:46.7G  Started: [22:17:20]  Best share: 682K
----------------------------------------------------------------------------------------------------
 USB management Pool management Settings Display options Quit
 3: AU3 3       : 250MHz 830mV            | 55.95G / 47.42Gh/s WU: 662.4/m A:231207 R:161 HW:   50
----------------------------------------------------------------------------------------------------
 [2015-03-04 22:44:10] Accepted 03668028 Diff 75/68 AU3 3
 [2015-03-04 22:44:15] Accepted 01e1823c Diff 136/68 AU3 3
 [2015-03-04 22:44:28] Accepted eb2aac5a Diff 279/68 AU3 3
 [2015-03-04 22:44:32] Accepted 022eb5ea Diff 117/68 AU3 3
 [2015-03-04 22:44:34] Accepted 02371352 Diff 116/68 AU3 3
 [2015-03-04 22:44:39] Accepted 02f78e00 Diff 86/68 AU3 3
 [2015-03-04 22:44:40] Accepted 03277b68 Diff 81/68 AU3 3
 [2015-03-04 22:44:55] Accepted 03132cdf Diff 83/68 AU3 3
 [2015-03-04 22:44:57] Accepted 015700b6 Diff 191/68 AU3 3
 [2015-03-04 22:44:59] Accepted 730b5238 Diff 570/68 AU3 3
 [2015-03-04 22:45:02] Accepted 0360514b Diff 76/68 AU3 3
 [2015-03-04 22:45:04] Accepted 0245f7b2 Diff 113/68 AU3 3

... does that mean that probably on of the four ASIC's died ? Is there a way to verify that ?

[Mikestang]

In the support thread someone posted a screen cap of the results of such a test.  One of their asic was dead, and the test result yield 3 voltage outputs I think.  It's toward the middle of that thread, I'll see if I can't find it again.

Found it:
https://bitcointalk.org/index.php?topic=827356.msg10084724#msg10084724

So check it out... Looks like I have been up and running for over 39 hours with no zombie...  However, it looks like only 3 of the 4 chips are working on my unit; thus the lower hashrates...

39 Hours before exiting:


Receive 1-3, missing #4:

[Piu3344]

Hm, how do I get to this voltage display ?

[Mikestang]

Hm, how do I get to this voltage display ?

I wondered the same thing, it appears to be a cgminer output maybe?  Some sort of command line function?  Maybe send a PM to the guy who posted those screen caps, I'd be curious to know, too.

[-ck]

That output is part of bitmain's fork version of cgminer and not part of the official cgminer.

[Piu3344]

Hm, I now build bitmaintech's fork of cgminer from Git-Hub.
But still I can't find that power menu/display ...
Can somebody point me to it ?