Topic: GridSeed 5-chip USB miner voltage mod - page 47. (Read 156988 times)

Yeah, but it's not so much the coin but the pool. Or, better, the share difficulty you selected in the pool settings.
There is no point in submitting 300k shares in 15 hours (I guess you mean that??), it just generates a lot of unnecessary
traffic. I'd suggest to select a higher diff if that is really the case..

I'm mining litecoins. If I mine Doge or any other like it, I get around 300k or so per unit.

I'd guess Simon didn't multiply with difficulty. What cgminers reports as A is not so meaningful
without knowing what the share difficulty is..

5000 accepted shares is quite low for 15 hours?

I have an unmodded pod running 875MHz that has 429,104 shares accepted in 20 hours.. which would indicate 321,828 over 15 hours.

Stats:  875MHz   372.3/372.3Kh/s   A: 429104   R: 9856   HW: 13

Well... according to cgminer local stats anyway...

Just an update

I applied some ceramic base thermal paste (Not electrically conductive) and re-ran my pods.
After 15 hours all my pods have over 5000 Accepted shares with 0 HW errors.

Looking good so far!

I ended up with girnyau's cgminer, too. No problems so far, working fine on my raspberry pi at 1150 MHz now.

I have been using the girnyau's gridseed fork of cgminer compile for Windows by sang - https://bitcointalksearch.org/topic/m.5799813

It has been rock solid, often running 7 - 10 days without a restart.

Today I compiled girnyau's gridseed fork of cgminer into BAMT 1.2 which I have been using for months.

The 'standard' Mhz setting for the sang Windows compile is 888Mhz, which I have been using without a hitch, but in Linux this fork of cgminer is very unstable at 888Mhz. I found that have use a factor of '50', so 800Mhz, 850Mhz, 900Mhz, and etc. I am currently running 850Mhz.

Can anyone else attest to this instability?

And what is the preferred 'cgminer' for running Gridseeds with Linux server?

Thanks!

Are you sure it is not a software...or pool issue...!

Did you try another MINER...or POOL...?

Well, shit fire!, Hashfire! Looks like you went and messed it up pretty good there matey!
Yep, I see cold solder joints all over the place i.e. OPENS = not a closed circuit.
If that particular resistor is out of circuit, you will see what you're seeing, no share submittals.
Are you using resin core solder? Doesn't look like there's any resin there. This is what cleans and helps the solder stick to the copper conductors. Without resin (flux) you are going to have the problems you've been having with soldering. Also temperature needs to be correct, even a little bit too high, but not much!

The corresponding pad (solder point) to the outer connection you are trying to make is the one just to the back (closest to the outside edge of the pcb) solder point where you soldered the inner point to.
Look at where the old resistor was connected. Those are the two solder points you can solder your resistor to. Trying to solder a 1/4W resistor to those two very close in points is going to be very difficult for a beginner or novice. It's even a tiny bit difficult for me but I can do it via techniques I know.

De-solder the resistor from the card. Use flux/resin core solder or some flux and put some on the solder points, then tin (solder) the points so they are clean and nice and rounded on the tops. Using resin will allow the solder to flow and it will cooperate with you and gravity perfectly.

Then, in the same way, tin the ends of the resistor leads. Then, heat both the solder point and the resistor tips at the same time and let them melt together into one beautiful SHINY solder blob.
The solder will shine brightly when done correctly. It will be dull if not.

Other than this, if you can't get it done right, please send it to someone who is qualified - like me - to do it for you!

Believe me, if you keep trying and fail, you just might do irreversible damage to those connections, then that will be it. Time to buy another miner to replace the nice pretty paper weight you just made  

Here is the result of doing it correctly....*******************************

*************************************************************
Remember, I can do this mod for you or anyone who needs it done by a professional. PM me for details.
And...
as usual, you do this mod at your own risk and expense.
Good luck!
Wolfey2014

I have resoldered this twice now and tested with DMM in OHM mode, I get a drop across the reistor for sure, but still not working.  I think my problem is I have messed up the pad on the outside where the resistor goes.  Anywhere else I can tie into?  Maybe from the bottom if I have to?

Yes, get some rubbing alcohol form your local pharmacy or grocery store.  Liquor is better suited for drinking and mouthwash is just wrong.

Isopropanole is the stuff you`re looking for...

nothing wrong with it, you could aslo use some kind of eau de cologne on a q tip to clean it. I just thought it was funny 

yes you can try to do it to see if the errors go away, but some people run the gridseeds without even a heatsink unmodded,

so my guess is that it wont have much effect

My two gridseeds are not hardware modded, but one of them gives 10x more HW errors than the other, even at a lower frequency. It is that one that I am interested in improving the heatsink contact with, to see if that is where the problem lies.

Mouthwash to clean the pads? Well it is a high concentration of alcohol... so? And it would leave the gridseed smelling great!

so anyone found out, how to mod the unit in a way you can switch voltages with the vid=1 option of cpuminer, like the first post mod, but using the voltages of 400kH and 500kH mods?

so you just can go back to almost stock software side,
the time when efficiency becomes more important

Don't be that affraid, I'm still using the stock TP's and works fine. Of course you can be a perfectionist.

Mouthwash to clean the pads? 

With the 5v fanmod they are really cold

Regarding TP mod..

http://cryptomining-blog.com/wp-content/uploads/2014/03/gridseed-5-chip-asic-new-version.jpg
I presume you throw away the heat pad seen in this photo.. then do the TP stuff afterwards? And has anyone got a photo of the other side?

Secondly.. I don't have vodka.. can I use Listerine to clean the chips prior to TP application?

So thanks Jamie! cpuminer didn't work at all, a precompiled cgminer underperformed similarly as the hashra-bfgminer,
but a freshly compiled cgminer did the trick. Working fine now

I made a couple of pics!

The workplace (I use an Atten 8502D with a build-in hot air unit and a 0,5 mm soldering tip):

The miner before changing the resistor (I used Kapton tape):

The result:

Happily hashing now :

I'd like to thank all of you who participated in this thread, in particular the one who discovered this trick (I believe I used the
description of Wolfey with regard to which resistor needs to be exchanged for what, but I'm not sure if he was the first to find
out. If so, thanks Wolfey!)

I'll take care of my other units now

oh you got luckly. i wouldnt recommend that one as it has a strong possibility of damaging your board, ie breaking a track with it. the tracks are really small and can get pulled up or broke if too much force is applied.

Specifically, the pool-side accepted shares are what our pay is calculated from, which may or may not match the miner accepted shares.