Topic: A4 Dominator - Pre-Order Group Buy - 280mh, roughly 1000w, $1800 + shipping - page 22. (Read 122571 times)

Each cube draws about 510-520W. The Lepa has 1600W on 4 rails. Shouldnt be a power problem to power 2 cubes at around 1030W.

My First guess here is you have a bad PSU, I wouldn't keep trying with it until you can confirm it will handle an 1100w+ load. Just because its rated for 1600w, doesn't mean its not defective or bad.

My advice is get another PSU and test again.

EDIT: I don't think it's a good idea to use two PSU's or any PSU not known to be good as these things aren't exactly cheap to replace and probably not easy to get warranty work on either if you have been following this thread.


I haven't noticed it myself but my backup pool is NH and they seem to work fine but haven't checked for xnsub.

The only thing you can really do is make sure you're running whatever latest software version for your Batch and hope that Inno delivers the open source version of the software as promised (Inno said they would in this thread, many pages ago, it's in my post history where I quoted it)

Anybody knows if the A4 supports #xnsub ?

Attempted several times ... but seems not supported.

you may need 2 psu's even thou it should work with the one...(imho) I have heard of problems like this with titan cubes 1600 psu's should run 4 cubes easy but only could run 2
may be the same thing?

So i plug in all 4 6 pin connectors, and both units will start up, it takes about 20 seconds or so before they start to mine, but before they start mining, the PSU just shuts off, including the pi.  I have tried each unit separately, and they run without any issues.  I also remembered I had an extra 600 watt PSU upstairs and got that plugged in to one, with the LEPA in the other, the first time it started up and I was able to see both of them on the live stats, but I don't think they were both hashing as nicehash didn't show more than 140 MH/s.  Now, I can't get both of them to show up again.

EDIT:  I realized my little 600 watt PSU really is at the end of its life and can no longer sustain output.  Just laid the ol guy to rest in the trash can.  Plugged it in with a different PSU and they are both hashing away.  But, again, its on 2 different PSU's.  Not sure what is going on.

Interesting.
When I first set up my miners, I had one running on a lepa g1600 without any issues except the ones we have all been discusing. Right now im using the 2880W IBM power supplies, each powering 2 rigs.
Are you saying that the power to the miners shuts off when you turn the Lepa on? If so, it could be a short.
I would try one board at a time and see if you can get it going that way.
The PI seems to be powered through the ribbon cable, so only a single board is needed to get the PI online.
If the miner lights go out, do the lights on the PI stay on or does everything go off?

tbh i'm just surprised you bought one. they are obviously garbage in their CURRENT state...

Got my unit this evening and have been working to get it setup.  I am using a LEPA 1600 watt PSU, but the 2 units won't start up with it.  I can get the red lights blinking, but when I start the units up, everything just shuts off.  I can start each unit individually, but not sure whats going on when trying to run both.  Any ideas?

I am getting a lot of questions via PM's from a lot of people here regarding this mess with the A4's.  I can tell you that I know what everyone else knows, which isn't much.  I know people are frustrated and angry.  I know, I am one of the frustrated and angry customers myself.  It has been a week now since Inno said they were going to set something up to take care of this situation with the miners.  But now I am hearing rumors that it isn't going to happen.  I don't have any confirmation yet from Inno. 

So I have a feeling we are going to have to work to resolve this as a community the best we can if we can get our hands on the jigs to do the flashing.  I just sent Inno and email suggesting that they can send me a jig and I will try to help coordinate getting this done.  I have no idea if they will take me up on the suggestion.

In the mean time I would like to see if we can get a show of hands here who has a jig or has one coming to them?  If you have a jig, or have one coming would you be willing to loan it to the community here so that we can try to come up with a way for members to get their units flashed?  I honestly don't think it is a good idea to try and ship jigs from member to member all over the country, but I am certainly open to input on the best way to try and coordinate this activity so that we get everyone flashed who needs it.

The next question I have is how many units are we talking about here in the US that need to be flashed?  I know this isn't a small number, but I don't know how many people have bought A4's directly with Inno that are in this boat with a B1 or B2 miner.  So I would also like to get an idea how many units we are talking about.

This could turn into a huge undertaking trying to coordinate miners coming in, miners being flashed, tested, and then shipped back out.  So there is a significant amount of work and effort to do this depending on how many units we are talking about.   

So lets sound off.  Let me hear if you have a jig or one is coming.  And I would like to get an idea how many A4's need flashing.  I would like to get a game plan together and start working the plan.  Thoughts?

I have 2 B2's that need to be flashed.

Inno would have recovered 99% of their costs with the 5 big investors they sought at the start. Everything else is pure gravy.
They're also locking out re-sellers and protecting their revenue stream that way so I think they'll be around to provide support for a very long time.

That sounds very straightforward... Why then am I hearing stuff like heating boards and removing parts? Sorry I am just trying to figure out if this is something I can do or not.. If its like you say it sounds very easy.. I got a response from Inno and they said they are working on getting a jig to the USA but have a very limited amount they sound to me like they would send one but they dont know who to send it to.
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Because the jigs are expensive and Inno initially intended to send small buyers new STM32 MCU chips to have replaced on the boards following the process outlined elsewhere (heat board, remove solder, remove chip, replace chip, etc, etc). Given the risks and cost of this vs. the freight of sending the cards to a central location where they can be re-flashed with a jig, I think the later is the most sensible proposition.

I read that post from lightfoot but that sounds more difficult and expensive...Why not just flash it if its as easy as it sounds?

Guys give me an address and I'll see if I can persuade Chloe to pay the freight to send the jig I have here in NZ to you. It looks like it's purpose built so now that I have flashed all mine I'm happy to loan it out to you. I'd kinda like it back though just in case there's a future firmware update that unlocks 400Mhs so I'd like to send it to someone core to the group-buy who can give assurances that it won't go missing ;-)

So, the update process seems straight forward.
Any news on who in the US has a Jig? Preferably in the Arizona area?
I can pull the cards and ship them to someone. Doesn't look like a lot of work, what would be the cost?

Lightfoot was outlining how he could do it with just a bag of chips and without a jig.

That sounds very straightforward... Why then am I hearing stuff like heating boards and removing parts? Sorry I am just trying to figure out if this is something I can do or not.. If its like you say it sounds very easy.. I got a response from Inno and they said they are working on getting a jig to the USA but have a very limited amount they sound to me like they would send one but they dont know who to send it to.

I think what is making this situation worse is that the A4 didn't deliver the big leap in hashing power per watt that they originally announced.  Had they made a significant jump in efficiency over that of the Titan then the Titan's would be dropping off the network with this generation of hardware and there would be mass adoption to replace that Titan gear.  Since we didn't get the efficiency improvements to make that necessary we have instead just grown the entire base of scrypt miners, not pushed the retirement of the previous generation. 

All that is making this formula for big diff increases, and lower LTC prices.  Not a good situation.  If the A4 gets a revision/update that suddenly has these same units pushing 400-500mhs for the same power consumption then this dynamic may change.  For now it isn't making a very pretty picture.

On the other hand you all may be now in the equivalent KNC Titan twilight zone. 😄

ASSUMING that this last big difficulty hump was the data hall first in line IPO Money
Do you really want any more (assuming you get your fixes) going out in mass
Like toasters?

Heh. You should be wishing for another couple years of flat difficulty like I had.

Uncomfortable an't it? You want more toys. But they are your difficulty doom. 😳