Topic: ANTMINER S4 Discussion and Support Thread - page 15. (Read 301481 times)

did u try bitmain??

Otherwise maybe look for people here on this forum with a broken one to sell..

having some issues with an antminer s4


https://i.imgur.com/mm4mS2r.png


https://i.imgur.com/bWiB9Ce.png

so I pretty much figured out that I have a bad IO board by putting in a good working one into this miner from another working miner. I am having trouble locating anything on fixing or replacing this board. Anyone have any insight on this?

Ok, ill try it tomorrow and report back.
I thing the best w/gh i have ever gotten was around 0.58 and thats what it is running now with this setup. And thats with the big white intake fan on the picture.

Cool thanks for ur response..

Can u try this?

Freq : 100

Volt : 0670

For 1008gh

With ur fans on min...

& tell me what ur voltage is on ur kill o watt???

Curious to see if what u do with the J7 & ur fan setup gives u less than 640w..

& if it does i'll try ur method to see if it can be replicated..

Edit : i have a batch 2 S4.

As promised a picture of the "S4 sandwich" 4 boards stacked. Fans running at 1200 rpm (silent) good temps.

I have a watt meter and I measure at the power draw at the wall. I have a build a PWM fan controller so I can set any fan speed I want. And I measure at the same fan speed when the J7 board voltage is set correctly and when its not. About 30 Watt per machine. 
Try my settings if you have a old miner like mine. I see that the older the silicon the more voltage you have to give them to run at lower speed. Its the wear of the silicon. Also you only need to restart them until you can see the correct voltage on the J7 board after that it will run like that until you hard restart it again. I run my fans at almost the lowest they can get 1200rmp so almost silent, it gets fresh air intake from the outside, right now the ambient temps are 23-24c at day and 15-18c at night and the machines get 46.-47c at the hottest board at day and 42-44c at night almost silent.
I will post a picture of the beast later today

This might sound weird but can u just pull the J7 board out of the miner & run the other 3 underclocked to save worrying about all the restarting???

Also i did underclocking before with the older firmwares, How are u measuring the energy savings?

I use a kill o watt...

The machine at standard in 2000gh @ 1450w = Freq 200 @ 0725 volt

When i tried underclocking, i used lots of different settings & the best i could get was Freq 100 @ 0680 volt & i got at the wall 640w.

Now after mucking around a little i had figured the 100w saving a made was due to the fans running slower & not cause of any underclocking settings i had used..

The 30w saving u got sounds like the same thing, The fans running slower & using less power & that's whats giving u the savings

Any thoughts???

This is what i would expect a 12 year old with no intelligence to say when they have been caught out..

I bet u were / are picked on at school...

Okay, I have spend some time figuring out the S4 J7 bug, I have two S4' s in a "custom" configuration (picture coming up later), they are running underclocked at settings, One is running  0.690V@175M, the other 0.690V/168.5M, old machines so not great but its ok. Pulling 2000W at the wall and ~3.4TH/s.  If you measure across the chips capacitor on the J7 board you will measure the chip set voltage. The trick is simple restart the machine until it sets the correct voltage on the J7 board. The S4 is bad at setting the J7 voltage at the startup so it usually takes a lot of restarts to get it right.

So the procedure is:

1: Start the S4.
2: Waite for the machine to set voltage on all the boards 1-2 min, you can see this when all the red lights (on the 4 boards) are on.
3: Measure the J7 boards capacitor voltage (across the capacitor) (the J7 board is the board that has red light on before all the others under the upstart sequence). If its not the voltage you have selected in the Advanced settings Restart the machine and try again.

I can post some pictures if needed, just let me know.

It may take 20 restarts or it may take just one, depending on the machine, one of my S4 does it the first time I start it, the other requires 5-10 times of restart.

Hope it helps. I save around 30 Wat pr. machine and lower temperatures on the J7 board. Not much but the chips run cooler and will prolong the lifetime.

One reason i ask about the J7 is cause i wanted to know if they have fixed this issue in the S4+ & if they did what did they do to fix the issue & can it be translated to the S4??



Edit : I'm already down clocking my machine, If one board on the machine is running higher than the rest (The J7) can it be disconnected to allow better efficiency for the rest of the machine?

I am not sure if this info can help, but I am using a firmware from smit1237 in my S4, cgminer 4.9.0.
It is downloaded from nicehash website:
https://www.nicehash.com/?p=software#asic

It supports overclocking and it is january based, so it is newer than official october firmware from bitmain.
I did test for some time and I have  problems on ckpool. I am not sure if problem reason are my settings or other, but now I am using with stratehm proxy that points to ckpool, and looks better , but not sure.

Your a di
Your a d!ck and your family and parents hate you don't they?  Go away and find your answers on your own.

I have asked doogie & no answer.... again if u bothered to read the whole thread!

I'm asking the board in general to see if anyone has ACTUALLY done it??

Not asking someone rude f%$k for links (None of which work as it seems he hasn't bothered to try it himself - Which is an even lamer response - if u havent done it don't give advice unless u know it works)

What would u have said if i had gone & done what u said & i bricked my miner???

All due care taken, No responsibility accepted???

And for ur information, Prelude & smit have a voltage working firmware (Except for the J7 problem) but are not giving it out cause its really bitmain's job & no one tipped smit for his work..  (I have however offered smit & prelude btc for the voltage firmware but to this day they are not willing to hand it over)

Thanks for nothing, Smack Head!

If you read all the pages then you would have had your answer and noticed everyone still believes it's possible even though Bitmain has taken that ability away it seems.  If you want a true answer hit up dogie.  Quit talking smack about people trying to help.

I have read all the 100 plus pages of this thread & have read all the info...

To me if u don't know the actual answer then chiming in doesn't assist me at all... Speculation is best left in the speculation thread!

Can someone explain what the J7 controller is on the S4??

Is the miner basically made up of 4 miners or boards chained together??

My understanding is the J7 has some sort of current issue causing it to run at 0765 volt instead of 0725.

Now as this is an issue & some of us are trying to underclock our machines to get a better voltage off it, Is it possible to disconnect the J7 so that the machine will run at the lower clock / voltage??

Just a thought???

While fixing one of my s4's PSU, I connected it with 2 s1 PSU's and it worked well.  I'd guess on the total of 1400W per s4, 600W per board and the rest for the controller should be ok.  Just try to distribute the power equally, and make sure there's more power on the hashing boards than the controller.  Of course you won't be able to close the cover...

Thanks for the info guys,

Any good cheap replacement  ?

Prelude, did you get my PM ? (About the fan replacement)

Wasn't blindly chiming in but trying to point you to the info.  I do not need to read the whole thread because I'm not underclocking mine.  I was giving you my best advice.  But since you read the whole thread .... theres your answer .... case closed...thank you.

Yep. Both versions are garbage. Might as well replace it now and avoid downtime.