Topic: GridSeed 5-chip USB miner voltage mod - page 10. (Read 156991 times)

That sucks.  Very strange also.  3 different mods, 2 different power supplies.  Same part blown on 3 boards.  Tell us more about the power supplies you have.

When u said USB ferrite bead, which one you meant? I might be able to help you to get them back working.

k, well that stinks. Maybe my next gridseed will be a bought overvoltaged one.

unless someone would like to do it for 20 bucks, mailed to them for me? Unless thats undercut pay.

Could just be fate

Are you using one of those crappy LED power supplies? Could be the cause and a sign that it's about to crap out and ruin all your miners.

I'm using high grade clean switch mode power supplies. Never use cheap crap power bricks or LED power supplies. LED's don't care about high ripple. Seeds do!

Remember, warm seeds are better than cooked seeds 

Good luck!

Well...I would definitely say DON'T try it on your gridseed until you've had plenty of practice with another circuit board with tiny components first.  To put it in perspective....the 0402 resistor on the gridseeds is about the size of the leg of an ant....or a large piece of sand.  

A hot air station makes things easier because then you can just use tweezers to pull the part off and replace it, but most hot air stations cost more than the gridseeds do now.

For some reason my units are dropping like flies.  In the past 24hr three units have burned the USB ferrite bead.  I can't seem to make any connections for why this is happening, one unit has VOLT mod 1; two bridges, has been running for a month.  The other two have "R-52 or R139" mod with 47k and 50k resistor, also been running stable for a month.  None of the units shared the same USB hub so I crossed that off the list of possible failures,  two shared the same power supply but the ferrite bead that burned is for the USB hense 5volts so not sure if that would have mattered.  I am lost finding any correlations between the units that failed, possibly just a coincidence or a weak part, but its suspicious that 3 have failed in the past 24.  We shall see, now have to order new parts and wait to get them back online.  

Thanks, nst6563. Looks so scary, and I haven't had any real experience with soldering, did a few huge cpacitors, 8-pin atx molex on a motherboard, went well. I tried jtagging a  e4200 bricked router, that didn't go to well.

Maybe I should not try this. :/

I used a standard cheap 30watt iron with a very fine tip.  A hot air station would definately be better, but it can be done with an iron if you're careful enough and have had practice.
I didn't use a solder sucker, I used solder wick, but really I didn't need to use it hardly at all because I didn't make a big mess while doing the mod.

Radioshack should have everything you need for a competitive price.  Some of their stuff (like individual components) is priced a little high, but the iron's, flux, solder, wick, etc. should all be relatively inexpensive.  I think they have a 25watt iron for like $14.  I know they have a $14 DE-soldering iron which I've seen some methods to convert it to a hot air iron by removing the bulb, and placing steel/copper wool inside the tube and attaching a small aquarium air pump to where the bulb was.  Might work, might not.  I haven't tried it myself.

What kind of soldering stations are you guys using? Also, are you guys using any particular soldering sucker gun to clean up any mess?

Basically, whats good for a good price amount.

And where to buy? radioshack, amazon ect?

thanks.

Edit: soldering tip size?

I will just add my 2 cents for the people thinking about this.... I have tested Vmod3 vs Stock and I GUARANTEE the voltmod pumps more accepted shares than stock.... I had them running side by side with the same pool my test Had 10 Stock vs 10 Vmod3 with the 49.9k swap @1200mhs for an EXACT 510KH NOTHING more or nothing less... Dont get confused by all the people claiming 600KH 550KH stable YES the pool shows what ever sometimes more sometimes less and sometimes VERY high, I listen to what the local hashrates as this is what the POD is ACTUALLY mining at. Just like travelling in a car and looking at the aftermarket GPS showing you how fast your going, you dont look at that right? you look at your cars speedo

 I do not get ANY disconnects now that I use a PROPER USB hub with enough power... I have noticed that if you have 10 port hub you need a 5amp POWER adapter if you dont want ANY Libusb errors or CGminer restarts << these happen when there is not enough power.. THink about it like this --- Each USB Port needs atleast 500ma of power, you can get lucky running less but don't be surprised if you get Cgminer shutting down or your hashrates aren't showing properly.

I purchased a 30day old used 49Port HUb for $80, This has a 40amp fuse and connects to a 24pin ATX power.

Anyway back to my test 10 vs 10, Started the EXACT same time Within 1 Hr this is where you see the Gap between the shares grow, and the gap keeps getting larger and larger, by 2 hrs the gaps show that EVERY single vmod pod beating the Stock and not by small amounts of shares by significant amount. Even the strongest stock do not have a chance...

Without a doubt Vmod trumps stock the only time you may think about not vmodding if your power costs are MEGA $$$ but even then it would have to be VERY Expensive not to take it...

a simple test is to use coinwars just to see if hashrate and powercosts increase or decrease your  daily profit you will see what I am talking about.

Do a test, goto profit calculater click on scrypt and enter your hashrate @ 510KH + 25w + how much your power is then click CALCULATE, check to see your profit then do the same thing but this time choose 361KH @ 7w at the power costs see the difference. PLEASE NOTE, this is ONLY to see the difference between the both not to see how much you will make.

Anyway as Of now I have modded every single pod to 49.9k and I run them at 1200mhz I hash tested 1275, 1250, 1225 & 1213   ---- DEFINITLEY 1200 i feel is the best but `1213 is OK also But id rather 1200 and seeing less HW.... I havent done extensive calculations between the HW error rates and the accepted between the above frequencies because I feel its a waste of time... 1200 @ 510KH is perfect for me..

Just my 2 cents.

$200 for 1mh Is expensive  gawminers, hashra need to really decrease there prices to compete, They state to deliver around Early June, Mark my words a week or 2 later you would be able to get quadriple the amount of hash for  half the amount and LESS power... We all need to stick together and dont buy unless the prices are right, they will stay at those prices untill people say NO, I will not buy... This forces them to reduce. There margins are HUGE

I am currently speaking to some developers which are releasing Cards that manage 38-39MH These cards each take 180w And you can fit them on a normal computer, You would not even need risers very slim , This will be around August.... I will be getting each card hoping $900-1000 each I have 2 MOtherboards from my GPU days each board has 7 PCIE slots... So just think about it 14 Slots, Each slot around 38mh And you can play games whilst mining and browse the internet

ANDDD these cards are capable of Scrypt-N they work like GPU's you can change the paramaters when the Nfactors change

The 20 I just received and modded earlier this week are all aluminum. Not silver.
Silver! Right! 

funny thing just happened to me:

removed r52 resistor with blob-method,
and while moving it down, it got attached to next pads, Cxxx location

and it was aligned so perfecty, i first could not tell if that has to be so!

Oh silver ones? first time I see those 

I've have got the gold, light gold and recently a red one but new model with smd led

Cool, thanks. I have pics of my rig if anyone wants to see it 

Oh, fuggetaboudit! ,,,,, here!
Enjoy..



Pea Ess - I think rather, our S-Hashers will be quite busy and profitable for some time and to a decent degree in tune with positive changes in the market over the coming months and perhaps years.
Just my .000020btc on the matter

YGPM I can help you.

It may boil down to the silicon lottery. I haven't volt modded mine, so the results are just out of the box. I did notice my board has micro LED's on it instead of the reg. ones pictured. Can't remember if it had 2 or 3 mosfets though.

Edit: It has 3 mosfets.

It is often more profitable to buy X amount of coins and sell them at a profit if you play it well you can ear WAY more than mining yes

I'm not really sure I could afford two blades for for my 20 modded pis...and even then I am not getting a huge boost.

By the time I am finally comfortable with the gear, I've got to sell it. It's impossible for a guy as busy as me to keep up with all this...

I sort of am growing to hate mining and regretting getting into it.

Exactly that's the way how to ROI always sell old hardware for new one

ps Zeus is on pre order not backorder if I'm correct? just like most new asics are pre order