Swedish ASIC miner company kncminer.com - page 1220.

Phoenix1969

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Quote from: eurgbp2011 on October 25, 2013, 08:37:21 AM

I tried. Nothing is loose.
How to detect which board is faulty?
I'd have to send back to KNC some boards, but I do not know which one to send.

status page

soy

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Activity: 1428

Merit: 1013

Quote from: chrono030 on October 24, 2013, 04:46:23 PM

Quote from: soy on October 24, 2013, 04:39:38 PM

Quote from: Phoenix1969 on October 24, 2013, 01:02:19 PM

just now...
Just as a little test... I gently just pressed on the vrm's on the slo sat, and rocked them side to side a tad with the tip of my finger. One of the vrm's gave a little "Click".
within 30 seconds, a couple cores were re-enabled in cgminer... and it has gained about 20 WU's in about 5 minutes, and 2-3 gh/s Will keep updated...

few mins later... couple more WU. 1 more gh/s

While my internet was down I shut down the miners and put a bit of cardboard between the VRMs and the ASIC cooler. I looked closely and the metal tops are epoxy'd in place with thin lines of epoxy. The snap could be one of those epoxy lines breaking. I'd like to take the tops off and see if an expensive thermal tape would help any, then re-epoxy.

This seems to be very odd. I am guessing that pressing a VRM wouldnt fix an issue with 1 -4 cores being out. Has anyone else done this? I have 4 cores that seem to be consistently off.

The theory is that the die is being heated closest to a VRM that is losing heat more than it should from the bottom rather than the top. Its clip-on metal heat sink is epoxied in place with thin dots and lines of epoxy, possibly since the whining noise complaint. If the warm VRM is losing heat primarily via the bottom the heat is moving thru the PCB then adding to the heat of the ASIC. If a technician were holding the PCB by the VRM while carefully placing the epoxy, he could be lifting the heatsink away from the underlying components it's suppose to draw heat from. Then you have a little gap between the heatsink and the underlying components. Some take the board out, and, after placing it on a flat surface so the PCB doesn't flex and break BGA solder points under the ASIC, apply pressure to the top of the VRM but not too much. They try and make better contact of the heatsink plate with the underlying components and in the process sometimes break the epoxy whence they hear a snap.

eurgbp2011

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Activity: 101

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I tried. Nothing is loose.
How to detect which board is faulty?
I'd have to send back to KNC some boards, but I do not know which one to send.

Crypto_Cumbrian

member

Activity: 113

Merit: 10

Quote from: Cablez on October 25, 2013, 08:28:49 AM

I have to ask, does this look right to everyone? I am wondering if it is a bertmod issue or why I get such poor performance, just disabled cores not showing.

Have you ran that Board in Isolation to see what Hashing rate you get from it. Unless its a mercury (if so what's your Speed).

btc_uzr

sr. member

Activity: 476

Merit: 250

let's have some fun

seems like the reason for poor performance Undecided

shut it down and press carefully (with light pressure) on those silver blocks, if there's a click it should work fine afterwards
if it doesn't help, RMA

Cablez

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Activity: 1400

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I owe my soul to the Bitcoin code...

I have to ask, does this look right to everyone? I am wondering if it is a bertmod issue or why I get such poor performance, just disabled cores not showing.

btc_uzr

sr. member

Activity: 476

Merit: 250

let's have some fun

Quote from: il_minatore on October 25, 2013, 08:22:16 AM

My jupiter has a problem, one board work at half power (2 or 3 times works correctly but no more), seems to be a supply problem, I tried every firmwares and every patches but nothing. How can I test for supply problem?
thanks

the only thing you can measure easy is voltage (device ~$5) ,

http://www.ebay.com/bhp/atx-psu-tester

but not how it behaves under load, therefore you have to spend quite some money
http://www.jonnyguru.com/modules.php?name=Testing_Methodology
"SM-268 does 8 loads and is about $2000 USD"

il_minatore

sr. member

Activity: 292

Merit: 250

My jupiter has a problem, one board work at half power (2 or 3 times works correctly but no more), seems to be a supply problem, I tried every firmwares and every patches but nothing. How can I test for supply problem?
thanks

btc_uzr

sr. member

Activity: 476

Merit: 250

let's have some fun

Quote from: btcusr on October 25, 2013, 08:19:44 AM

(...)

Why anyone put their BTC in, when there's no way to take it out? To protect the network from 51% attack?!

As an example, I prefer running hardware with less profit over trading on exchanges. Wink

*edit: and I bought miners with fiat

btcusr

sr. member

Activity: 405

Merit: 255

@_vjy

@Phoenix1969, No, I mean I expected that I'll surely get the BTC invested, at least after a year of mining. May be some profit second year. I'm sure 99% of people would have thought the same.

Why anyone put their BTC in, when there's no way to take it out? To protect the network from 51% attack?!

btc_uzr

sr. member

Activity: 476

Merit: 250

let's have some fun

Quote from: demonmaestro on October 25, 2013, 08:03:49 AM

Quote from: Phoenix1969 on October 25, 2013, 07:57:08 AM

Quote from: btcusr on October 25, 2013, 07:52:02 AM

Miners should be sold with the warning,

You can never get all your Bitcoins back. Hoarding is safe and bitcoin deflation pays you better returns.

Sigh. Sad

so I guess we should all just unplug & give up then, rats.

that and just hope that our transactions will go through. Shocked

wasn't buying btc not *always* the better choice regarding profit?
where you in hope the asic gods would make it change ? pray harder !

some advantages of buying btc are:
-no fires, noise, heat
-no downtimes, maintenance
-no replacement parts and electricity bill reducing whether your amount of mined coins or forcing you put in additional fiat
-you can sell them in seconds, not like hardware

Phoenix1969

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Activity: 938

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Quote from: eurgbp2011 on October 25, 2013, 08:03:43 AM

v0.97 yes
enabledcores yes
what is VRM?
and how to test VRM?

its in the forum here, but usually, a slo board is meaning most likely that one of the vrm's are not snapped down fully.
instead of the heat dissapating to the top cover, it travels down & across to the asic & heats cores, causing the disabled cores.
there is a post on how to proceed, but it involves gently pushing them down, and rocking them sxs. a click heard means bingo, then wait & see

btc_uzr

sr. member

Activity: 476

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let's have some fun

btw, meanwhile HF customers getting angry
Seems like KnC customers can be relaxed regarding diff jumps in november

Quote from: ninjarobot on October 24, 2013, 06:57:50 PM

HF is losing credibility fast. Lets hope this does not turn into yet another BFL, although it is sure starting to look like it.

As for me. When I ordered and paid for my BJ the words 'anticipated' and 'December 31' were not on the site/conditions. Those were added later. It simply stated 'Shipping starts October 20-30, in order of purchase'. Fact.

Quote from: cedivad on October 24, 2013, 06:49:52 PM

Quote from: Visesrion on October 24, 2013, 06:09:40 PM

Well, I got an answer for the suggestion for upgrading the BJs orders into sierras:

It's the same exact email i got.
BS... bs everywhere.
Signed by their ceo, right? I even lost time replying.

Ok, i will move on legally.

edit:
might be xmas until they ship batch one (to 155 customer?)
https://bitcointalksearch.org/topic/m.3405760

demonmaestro

hero member

Activity: 574

Merit: 500

Mining for the hell of it.

Quote from: Phoenix1969 on October 25, 2013, 07:57:08 AM

Quote from: btcusr on October 25, 2013, 07:52:02 AM

Miners should be sold with the warning,

You can never get all your Bitcoins back. Hoarding is safe and bitcoin deflation pays you better returns.

Sigh. Sad

so I guess we should all just unplug & give up then, rats.

that and just hope that our transactions will go through. Shocked

eurgbp2011

member

Activity: 101

Merit: 10

v0.97 yes
enabledcores yes
what is VRM?
and how to test VRM?

Phoenix1969

legendary

Activity: 938

Merit: 1000

LIR DEV

Quote from: eurgbp2011 on October 25, 2013, 07:56:30 AM

KNCMINER Accepted shares
Good Miner =6173696 (99.82%)
Bad Miner = 4973056 (99.68%)
~24% difference
How do I detect which pcb is not working on bad miner.
Have I got RMA claim?
And how to remove boards from miner?

Firmware?
did you do enablecores?
vrm test?
Have you followed any of the steps?

Phoenix1969

legendary

Activity: 938

Merit: 1000

LIR DEV

Quote from: btcusr on October 25, 2013, 07:52:02 AM

Miners should be sold with the warning,

You can never get all your Bitcoins back. Hoarding is safe and bitcoin deflation pays you better returns.

Sigh. Sad

so I guess we should all just unplug & give up then, rats.

eurgbp2011

member

Activity: 101

Merit: 10

KNCMINER Accepted shares
Good Miner =6173696 (99.82%)
Bad Miner = 4973056 (99.68%)
~24% difference
How do I detect which pcb is not working on bad miner.
Have I got RMA claim?
And how to remove boards from miner?

btcusr

sr. member

Activity: 405

Merit: 255

@_vjy

Miners should be sold with the warning,

You can never get all your Bitcoins back. Hoarding is safe and bitcoin deflation pays you better returns.

Sigh. Sad

Crypto_Cumbrian

member

Activity: 113

Merit: 10

Got my Three replacement Boards for my underperforming Juipter.

Previously I had around 400Gh/s average (360Gh/s at BTC-Guild) over 25% HW errors.

Now

Average 540Gh/s (5sec Shows peaks of over 600Gh/s), BTC-Guild showing 507Gh/s.

Running 0.95 (will let it burn in for 24 hours).

*Noticed new boards all still Rev1. But had Labels on them all marked as G (don't know what that indicates if anything).

bertmod Show all cores on all dies 100%.

Using Chill Factor 3 Thermal paste.

Will update tomorrow after 24hrs.

Topic: Swedish ASIC miner company kncminer.com - page 1220. (Read 3049524 times)