Topic: Hacking KNC Titan / Jupiter / Neptune miners back to life. Why not? - page 25. (Read 76798 times)

I run my sample cube with a pair of Corsair 750M's, one per side to a single Titan. With that the connector does not overheat at 300/325mhz per die. A single supply with one cable will overheat the Corsair plug. With two cables it will overheat the connector on the Titan due to voltage drop. With two supplies, two cables the voltage is high enough that the amps on the cube's 12v side don't burn pins.

Really, be careful. I have another board here with a burned plug, and a board came in that had the sink torqued down so hard it CRUSHED THE BOARD. I literally am going to have to take some pictures of that. As in ripped open on the bottom :-)

Back to work.

my setup

lostgonzo.imgur.com

I am running 3 cubes to a corsair thou FYI as you can see on the above...perhaps even for a 1200 that is pushing it maybe..thou the one that seems to have failed

2x in last week..now has one cube on it lol .....only ever had 2 cubes on it.....hell its bad no doubt i guess


Yeah 1st one went after 14 months or so

Have 2nd one still going after 13 months

this 3rd replaced by corsair one ...4 months sheesh...and unhappy trend

the one that is fading now is the RMA new (or refurbished) can't tell replacement for the 14 month one that went

on a side note my black/yellow made molex psu 3 lead y adatper plugs all started to burn out after 14 months ..replaces almost all of them..the KNC ones had 1 burn out

the other seems fine.....knc that is ...so far..

the other couple non knc  seem  unaffected so not  replaced yet...but that is also a consideration.....not a slam on the made plugs i had made...but something to consider

stuff like that may also start to go at the 15 month or so mark.....also would depend on how much 'pitting' you'd get from moving cubes around and such

I think I will have no problem sending the corsair 1200i back its only been 4 months ...but hell the stuff is in the basement and not even warm yet

i dread summer


have a buddy with extra platinum server psu's that can be mod'd to work 95% eff they are 1250's etc 100 bucks each I'll try instead ...maybe if i get another corsair 1200i

back new(ish) as a replacement yet again I should just keep it in the box for a swap out replacement and hopefully the above server psu's will do the trick at less cost

(and hopefully this yo/yo will stop)

I've been running my two Corsair RM850 since October 2014 without any issues yet.  Of course now that I've said that I'm sure they'll start to go.

I've been using Corsair 1200i's on my Titan setup. My Original Corsair on Original Titan lasted 13 months or so. It just kinda would fade off 1x or 2x a week.

So Corsair let me send it in as a return. The unit for my 2nd Titan March 2015 is still working fine.

So I get the replacement Corsair 1200i ...looks new...box new...unsure if it was really refurbished or just replaced...different serial numbers etc

And it has been around 4 months and now it is fading also with only 2 cubes (i've added) since ...so its not load nor heat.

Is this just the common way PSU's kinda die.....? Using Gen Tarkin software so there are occasional soft reboots etc .....is the only real change.


Anyway just wondering if Corsair 1200i's are known for this kinda thing and I should just take the next replacement (likely they will do so) and put it on

a shelf and use a different branded platinum PSU etc etc


Not a good sign...1st one 14 months ...acceptable.....2nd one I got 1 year 1 month still going strong...the replacement I got on RMA 4 months ago

now fading on a different controller and cube setup in the same manner as the first unit I sent back and this is the replacement for that


Anyway ...maybe it is  a 'true' refurb with a cursory check at Corsair's Service Dept end and this is common....


anyway just tossing it out there for those with BIG farms that may run into this kinda thing more due to more units or something

see link below for my setup ..the miner pic shows the 1st titan with 6 cubes (stable as a rock go figure) the 2nd Titan shown setup is same but only 2 cubes now on this

fading 1200i corsair....ie heat is NOT and issue at all (yet)

www.lostgonzo.imgur.com


anyway again wondering ..the dance is getting kinda old ......maybe on fixed/returned/rma units this is just the way stuff shakes out?

no he cant because he is a noob
(not enough posts)

Instead of pasting in the link as a hyperlink, select Insert Image which is the icon on the left of Insert Hyperlink. pasting the link info into that results in


A tip - if possible please crop the image to just the area of interest to speed up loading time on slow connections...

Ug. Yep, how many watts was the cube pulling?

An update...


I allowed my 3 cubes to go grab some extra gigahashes and by sunday evening I began to smell something a little "off" however everything continued to mining so I ignored it like a dude who had cubes to burn so to speak. 

In fact I actually did have one that was free or late shipping (ebay) so I figured letting just that ONE run at or approaching "StoCK" settings like 450mhz-.366 pulling 270 watts was kind of a gamble that I consciously decided to take and sure enough that smell was a harbinger of the inevitable probably was too late by the time they can produce that smell anyway but so yeah

Here's the autopsy photo's.









PS..Pardon my noob-itude but how does one post photo's/jpgs etc directly into threads/replys?

I know there's a way but I don't know it obviously...anyway if somebody might have a suggestion on that I'd appreciate it.
Apologies in advance but 2yrs lurking on and off with this place still haven't a clue how a vast majority of any of this stuff works...

hey lightfoot, sentcha a PM.

They start to behave like that, when they get older. Maybe it helps to replace the 5 ceramic capacitors at the input of the power supply. These capacitors are dedicated to reduce interferences triggered by the ASIC power consumption changes. With a 300 MHz oscilloscope that should be visible.
Did you found out the capacity of those 5 capacitors? In one of your previous posts, you wrote something about 25 uF. Are all 5 identical with 25 uF ?

Hm. Clocking down to 250 did not work, two sets of power supplies dropped off. Switching voltages didn't help either, below a specific clock speed (275) dies will fall off line.

Which makes *no* sense, but seems to fit a pattern: Titans have a sweet spot where they are stable in a voltage/frequency level. Run them there, things are good. Run them other places and the power supplies destabilize.

First day in the mid-80's (F) here, and wanted to let you know my Titan control cube here is running at 56c on the die, 90c+ on the power supplies. 300/325/325/325. I was running it full blast with two 750w Corsair M power supplies feeding the double plug to see if it would overheat the Molex. (oddly enough it did not).

NOTE: When it gets warmer the air cooled units will run a lot hotter. This is 20c hotter than it was a week ago with temps in the 30's. Be warned, I am clocking down to 250mhz.

On the Raspberry pi? If it's crap, just buy a new one on Amazon. Make SURE you get the 1.2 version Revision B and not the newer Raspbery Pi II or III.

This one should be it:

https://www.raspberrypi.org/products/model-b-plus/

Thank you so much! )

On the subject, it seems flash memory on the motherboard miners are problem

It looks like I now have a very expensive brick

re-do the SD card again...use a new one is preferable. I use Sandisk 8gb Class 10's

you also can't just 'copy' the img to an SD card (you probably know this but just in case)

follow the instructions below

http://www.kncminer.com/support/titan-setup-and-firmware (again you probably know this but just in case)

check ribbons on the right way etc. you have proper PSU's (above say 750 watts) and the y adapters for such

If you have a spare Raspberry Pi B+ 512mb laying about you could swap that in..but I'd wait on that till others reply here

I'm just replying here for you as a 'place setter'  till the brighter folks on this stuff chime in

(ie moral support)

anyway that is all that comes to mind.....others with better skills then myself will chime in a few hours


also here is an 'archive' of the old support site on internet way back machine...maybe it will give you some clues....if nothing else interesting to poke around

http://web.archive.org/web/20141205190422/http://forum.kncminer.com/

again others on here will have better advice...all I can think of

Hello!

It seems that the official support KnC no longer responding.

I had a following problem.
Miner does not answer! I can not go to its Web-page.
I set the image 2.0 Titain on the SD card instructions.
I tried set latest firmware, but to no avail.

Indicator write:

EmptySpace
192.168.1.9

When I connect the monitor, i see next:

Starting Factory setup: ERROR: No serialnumber found
ERROR: No eeprom found
ERROR: No eeprom found
ERROR: No eeprom found
ERROR: No eeprom found
ERROR: No eeprom found

What should I do?

Neptune might not be worth the cost to fix at this point, but open it up, take off the heat sink, and look at the power supplies. Maybe one of them has exploded?

If not, what's a real basic way to do this? Bad cheap repairs. You could check each supply's output to see if it is shorted or 6-12 ohms. If shorted try ripping it off the board with a screwdriver if you don't have a very hot air gun. Actually you could just knock the two FETs off with a chisel or smal screwdriver and hammer, hitting from the side.

Oh yeah, that would be a way to do it on the cheap :-)

C

One of my Neptune cubes stopped working yesterday and so looking for a way to get it fixed.  I'm based in London, UK.
Basically when it is connected to my PSU, the PSU shuts down as soon as I try to power on.  So, I've disconnected that cube and the rest of my Miner is running at 80% capacity.
I can't see or smell anything obviously wrong with the dead cube but it flat doesn't accept any electricity properly.

Is there an easy way to get this fixed?

Try -.06 volts instead of -.03 volts. Then try 400mhz speeds. See what you get.

C

Okay but how do I cut the voltages?

There's like 37 different toggle points at each die the 1st one should be lowered I'm assuming it defaults to -0366 so I should try a lower setting??

Next thing...About the frequency cutting it seems the more aggressive cutting of 100mhz or more from the 475mhz "stock" range Nearly always produces a dead die or multiple dead dies.

Perhaps this is just a bad cube and I should not bother with it?

Thanks again for the warning ;-)