Topic: ANTMINER S4 Discussion and Support Thread - page 40. (Read 301481 times)

Thanks for the info!  I got problems with 3 or 4 fans up to now and my guess is I will have some more defect ones in the near future.

Now I have another dead S4 PSU.    I think it's the 4th one I am having problems with!  Last one, it took Bitmain 1 month to replace.  Hoping to have more luck with this one.  If you have DIY instructions to repair the PSU, let us know!  

EDIT: Removed images

Thank you for the DIY S4 Fan repair guide. 

nice but not enought... i have said and show that a lot at long time ago, now C2 and S6 is coming pufff lazy bitmain peoples.

Well, I'm happy to report that my attempt at repairing the fans was a success.  I had quite a few fans that needed repair. I was never a big "fan" of buying fans.  Even in the old GPU days, I'd find tricks to repair the fans instead of buying new ones.

I ordered 3mm retaining rings from McMaster-Carr
http://www.mcmaster.com/#98541a111/=wdsnjk
$5.00 for a bag of 100 pieces

Also ordered the requisite pliers
http://www.mcmaster.com/#58225a21/=wdso3i
$16.98

Remove the sticker on the fan to expose the bearing and most likely a bunch of dried up grease and the old retaining ring that wore off. I found a few that look like the ring completely disintegrated because I was unable to find any evidence of an old one.



Remove the fan blade, remove the bearings, and carefully remove the spring from the shaft. Don't lose the spring
If the old retaining ring is still under the sticker and it didn't disintegrate you'll be able to see the wear that happened.  Here's a pic of a new retaining ring alongside a worn one.



I had to do some trimming of the retaining ring pliers since it didn't fit into the bearing area.  Used a dremel to carefully remove some material so that the fingers of the retaining ring pliers would reach into the hole.

Here's the pliers with one side done:


and then both sides:


I used denatured alcohol to clean everything well (the fan housing, area where the bearings sit, the bearings and the fan shaft).  Liberally dabbed some lithium grease on the first bearing that sits on the spring.  Don't place any grease on the other bearing until you have it seated and the ring installed.  Then hit it with some grease.  If the ring is not placed correctly, the fan will not spin frictionless. You'll feel and hear the shaft grinding.  If there's any grinding, the most likely culprit is that the ring isn't installed on the shaft groove properly. I used some gorilla duct tape to seal the end.

I averaged about 7 minutes per fan.

Great to hear! All I (and many others I'm sure) wanted was word from Bitmain that they acknowledge the issue and plan on fixing it. Communication is key! Thank you. 

@Prelude,

Requests were in to the programmers and engineers.  Unfortunately, we wrench monkeys can't write the firmware.  Please be patient!

Thank you

Bitmain, have you forsaken us?

Makes sense Thanks

Yes, the wattage drop you saw is just from frequency.

You went from 225MHz (220 isn't an option) 0725v to 187.5MHz 0686 correct? With a 100w drop?

Try 187.5 0725, you'll see the same power draw.

Why would the wattage at the wall go from 1400W to 1300W by changing From 0725 to 0686. Are you saying that the wattage change is just from the frequency change and the voltage is still the same. Trust me I am trying to figure this one out myself. Thanks  

Are you blind or just trying to piss me off on purpose? Answer my damn question that I have directly addressed to you multiple times please instead of cherry picking who you provide support to.

When will the broken firmware be fixed? We need voltage control!!!!

Impossible to under clock properly because of the broken firmware. All you can do is lower frequency without being able to lower the voltage. Voltage is where the real power savings will come from, along with reduced heat.

The 20150129 firmware? Frequency works but not voltage. Give it a try, measure at this wall at the same frequency but change the voltage.

In anybody willing to share how far you can under-clock the s4?

the new S4 firmware looks like it is taking the Frequency to voltage change without a restart tested with a WEMo at the wall. Voltage went from 1400+ at 220 0725v to around 1300 at 187.5 setting FREQ voltage at 0686   

Thanks!  I just sent an email.  Was hoping to try repairing these myself so I don't have to keep bugging you guys with fan replacement requests.  Seems the ring might be a 3mm?  I've ordered 100 rings.  If they are the right size, I should be set for a while 

For the damaged fans, please email  support @ bitmain . zendesk . com  with your order ID

The small pin/clipper we will try to get the spec for you.

Well... I've gone thru another bunch of fans for my S4s.  Going to put in a request for replacement fans with Bitmain, but having taken one apart, it looks like they should be repairable.  Has anyone tried to figure out what size the retaining ring is that holds the fan spindle.  It looks like all these fans are failing similarly.  The ring pops off, probably due to wear.  I'm assuming it's metric.  Looks like 3mm. Just FYI, the second image shows the existing retaining ring popped back onto the spindle but it seems a bit loose and will probably pop off again.  I'm guessing the ring has worn down a bit, just enough to let it pop off.

See attached pics.

 

Yeah, I did. I thought you meant a different forum.

I have two identical miners with the following config

 Antminer S4
Hostname antMiner
Model GNU/Linux
Hardware Version 3.4.3.0
Kernel Version Linux 3.8.13 #12 SMP Mon Sep 29 11:13:50 CST 2014
File System Version Thu Oct 16 15:58:23 CST 2014
Cgminer Version 4.6.1
Uptime 1
Load Average 1.21, 0.33, 0.11


I'm trying to get it to run at 1850GHZ or so using 1.81MHZ and .0680V  and 1050W  ( following the chart on previous pages)
but when I check the wattge from the wall its pulling 1180W and only running at 1700GHZ

any ideas ?

Right now I'm stuck at stock speeds of 2000GHZ and its pulling nearly 1350 from the wall which is a lot of heat generated

temps are in the 44-49s at night and 50-55 close duing the day