ANTMINER U3 Discussion and Support Thread

[Jake-R]

My two U3s (V2 w/wire cage) bricked a few days ago using the included 7.5 amp laptop-style power supplies. I did not overclock and was getting a consistent 43+ GH/s hash from both using cgminer for windows.

If I plug them into the original 7.5 amp power, the fan "pulses like a heartbeat, but that's it. I tried a new 10 amp psu and they do nothing at all.

Are these dead for good? I have my doubts that Bitmain will do anything about it...suggestions welcome.

I had two running. One of mine bricked itself too and nothing I did got it going again. The second one is still hashing.

[jlauzon]

Bitmain Support replied with the usual troubleshooting steps.

So, I wonder if the FEM is accessible in these rigs.

Anyway, I'll see how far support can help me.

[tkalfaoglu]

I recently got an Antminer U3 to run on a Fedora 21 Linux system.. It runs fine under cgminer 4.9.1, except about once a day it freezes up,
and I have to unplug and plug it back in again..

I'm not overclocking it , and it seems fairly cool - not overheating.

Any ideas what to do?

Thanks, -tk

[Mikestang]

I recently got an Antminer U3 to run on a Fedora 21 Linux system.. It runs fine under cgminer 4.9.1, except about once a day it freezes up,
and I have to unplug and plug it back in again..

I'm not overclocking it , and it seems fairly cool - not overheating.

Any ideas what to do?

Thanks, -tk

What's the problem?  Sounds like it's running as well and the U3 can, all systems normal.

[tkalfaoglu]

Many thanks, I didn't know it could not run for weeks or months at a time..
-tk

[Mikestang]

If you read through this thread you'll find that your U3 going ZOMBIE is totally normal and a result of poor design by Bitmain.

[jlauzon]

Just an FYI...

When I was working with Bitmain support on my dead U3s, they said they're releasing "an S7 in July, but they can't give details".

Take it at face value.

[speedt_ouch]

How do I setup two Antminer U3 on the same computer?

I read users here running 5 and 6 units...

I tested then separately first to make sure each one is working. I confirmed that, and no errors.
All working fine and they start receiving block when connected one at a time.

When I connect both antminers I start getting error:

 [2015-06-30 14:32:29] AU3 1 attempted reset got err:(0) LIBUSB_SUCCESS
 [2015-06-30 14:32:29] AU3 0: No valid hashes for over 2 secs, attempting to et
 [2015-06-30 14:32:29] AU3 0 attempted reset got err:(0) LIBUSB_SUCCESS
 [2015-06-30 14:32:39] Accepted ****** Diff 840/256 AU3 1
 [2015-06-30 14:32:47] Accepted ****** Diff 1.96K/256 AU3 1
 [2015-06-30 14:32:50] Accepted ****** Diff 508/256 AU3 0
 [2015-06-30 14:32:55] AU3 0: No valid hashes for over 2 secs, attempting to
et
 [2015-06-30 14:32:55] AU3 0 attempted reset got err:(0) LIBUSB_SUCCESS
 [2015-06-30 14:32:55] AU3 1: No valid hashes for over 2 secs, attempting to
et
 [2015-06-30 14:32:55] AU3 1 attempted reset got err:(0) LIBUSB_SUCCESS

Any suggestions?

Both U3 are directly connected to my Windows XP machine, no hub in the middle

Thanks

[jlauzon]

What version of cgminer are you using? I had to download cgminer for Windows from Bitmain to get rid of that error.

[spazzdla]

Just an FYI...

When I was working with Bitmain support on my dead U3s, they said they're releasing "an S7 in July, but they can't give details".

Take it at face value.

REALLY... humzzzzzzzzzzzzzzzzzzz.... tempting.  The S5 was just not enough of an upgrade from the S3 for me to grab it.

[gingerbaker]

I need some help with getting my new U3 to be recognized *by cgminer*.

My computer recognizes it under devices and printers as the name of the driver; CP2102 USB to UART Bridge Controller).

I installed the driver (silabs USBtoUARTBridgeVCPDrivers.aspx).
Then went to zadig and did everything correctly per Bitmain's U3 user guide.

Then when using cgminer (4.8.0, though it happened in older versions too) I get the following errors:

USB init, open device failed, err -12
You need to install a WinUSB driver for - CMR device 3:1 (after re-boot using different USB port- 3:2)
And associate - CMR device with WinUSB using zadig
See README.txt file included for help
BitMain detect <3:1> failed to initialize <incorrect device?>
No devices detected!
Waiting for USB hotplug devices or press q to quit

I've tried using different USB ports, though I dont think that's the issue as my computer always recotgnizes the device in System Panel.

Can someone please help?

Thanks.

[speedt_ouch]

What version of cgminer are you using? I had to download cgminer for Windows from Bitmain to get rid of that error.

Hi.
I'm using cgminer 4.9.2

I did not try any other version. I assumed the last version would be the best bet!

What previous version should I test?

[Jake-R]

cgminer 4.9.0 works for my U3.

[gingerbaker]

Okay, now this is getting VERY confusing, but at least it appears to be hashing somewhat.

I tried plugging it into my USB Hub that I run my BlockErupters on and started up cgminer and got this:
http://s28.postimg.org/y9kid70bx/upload.png


Can someone please make sense of this??   

[Mikestang]

How do I setup two Antminer U3 on the same computer?

I read users here running 5 and 6 units...

I tested then separately first to make sure each one is working. I confirmed that, and no errors.
All working fine and they start receiving block when connected one at a time.

The people who get more than 1 to work are the exception.  People like us who have 1 work fine and plug in a second and all goes to crap are the norm.  There's nothing you can do, I have tried everything.  Some systems it works, most it doesn't.

[Mikestang]

I need some help with getting my new U3 to be recognized *by cgminer*.

My computer recognizes it under devices and printers as the name of the driver; CP2102 USB to UART Bridge Controller).

I installed the driver (silabs USBtoUARTBridgeVCPDrivers.aspx).
Then went to zadig and did everything correctly per Bitmain's U3 user guide.

Then when using cgminer (4.8.0, though it happened in older versions too) I get the following errors:

USB init, open device failed, err -12
You need to install a WinUSB driver for - CMR device 3:1 (after re-boot using different USB port- 3:2)
And associate - CMR device with WinUSB using zadig
See README.txt file included for help
BitMain detect <3:1> failed to initialize <incorrect device?>
No devices detected!
Waiting for USB hotplug devices or press q to quit

I've tried using different USB ports, though I dont think that's the issue as my computer always recotgnizes the device in System Panel.

Can someone please help?

Thanks.

Don't use 4.8.0, go to ck's page and download 4.9.2.

Re-zadig until it works (plug in power to U3, then usb, then zadig it, then unplug usb, count to 5, replug usb), the message seems to be the one you get when you don't have the winusb driver zadig'd.

[Mikestang]

I tried plugging it into my USB Hub that I run my BlockErupters on and started up cgminer and got this:

The U3 probably isn't compatible with block erupters, try it on that hub without them.

[Mikestang]

What version of cgminer are you using? I had to download cgminer for Windows from Bitmain to get rid of that error.

Hi.
I'm using cgminer 4.9.2

I did not try any other version. I assumed the last version would be the best bet!

What previous version should I test?

4.9.2 is the best version, it has bug fixes from 4.9.0 that specifically effect the U3; carry on.

And people wonder why I post in any thread considering a U3 that they are crap machines and not worth the effort, just the last page of this thread sums it all up.

[gingerbaker]

I tried plugging it into my USB Hub that I run my BlockErupters on and started up cgminer and got this:

The U3 probably isn't compatible with block erupters, try it on that hub without them.

Thanks for the resposes!

The thing that seems odd to me is that it is showing as hashing both in cgminer as well as on my pool's website...
It seems the problem was plugging it in to my PC's USB ports because I didn't change anything other than to plug it into the powered USB hub.

Maybe get another powered USB hub?

Then again,  after all the headaches I've been through all last night and early morning, Idk if I want to change anything since I finally got it to hash...

Thanks again.

[Mikestang]

If it's working, don't touch it! 

Some people have luck with hubs, some people only have luck without hubs.  There doesn't seem to be a formula with the U3 that they all work, just stuff that everyone can try and some works for some and some for others.