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901  Alternate cryptocurrencies / Mining (Altcoins) / Re: GRIDSEED G-BLADE Overclocking 7Mh/s on: April 29, 2014, 07:39:39 AM

I actually have 35V 220uF, but I'll probably go for dual 25V or 35V 470uF depending on what I have at home.
And not SMD ones, they will be easier to solder.
902  Alternate cryptocurrencies / Mining (Altcoins) / Re: GRIDSEED G-BLADE Overclocking 7Mh/s on: April 29, 2014, 07:36:55 AM
Self destruction of the blade?

BTW, it's RST switch as on the pod.
Some kind of hard reset of the USB protocol.

It's connected to pin 7 of the STM32F103C8T
903  Alternate cryptocurrencies / Mining (Altcoins) / Re: GridSeed 5-chip USB miner voltage mod on: April 28, 2014, 08:45:25 PM


Anyone know of a free dsn viewer? I can't open that file from the github docs.



I don't have access to my main computer, but I believe that I used this one for brd and dsn

http://www.parallel-systems.co.uk/support/free-viewers
904  Alternate cryptocurrencies / Mining (Altcoins) / Re: GridSeed 5-chip USB miner voltage mod on: April 28, 2014, 08:38:04 PM
oh well looks like crystal swap is in the pipline - upgrade the crystal anyone? thinking maybe a 33mhz in there Wink.


Since I'm curious, I ordered some crystals to test on one pod. I'll report if anything apart from black magic smoke comes out of the tests.
According to gridseed notes, the crystal used can be up to 50MHz.
905  Alternate cryptocurrencies / Mining (Altcoins) / Re: GridSeed 5-chip USB miner voltage mod on: April 28, 2014, 01:21:10 PM
Can I get a second opinion on these 2 chips that I blew, are they the same and both  -

Device Type:  FERRITE BEAD_R1206_300OHM@100MH
Value:   300ohm@100MHz,3A

As  happydaze.


ANd guys be very careful those heatsink edges are VERY sharp , It basically pin-pricked the red cable and caused this short circuit

Yes, both are ferrite beads with the same value.
quite easy to find on ebay, mouser...

906  Alternate cryptocurrencies / Mining (Altcoins) / Re: GRIDSEED G-BLADE Overclocking 7Mh/s on: April 27, 2014, 08:46:54 PM
You can use the 8 chip ones from github.
If they aren't the good ones, they are really close and show you how are driven 5 lines of 8 chips on the blade.
the powerboard looks the same too except for a few components replaced with equivalent ones (VRM for example) and the main capacitor that for some reasons is 25V on the design and 16V on the blade. 25 is the good value for me. One rule for any capacitor to be safe: twice the voltage that will go through.
907  Alternate cryptocurrencies / Mining (Altcoins) / Re: GRIDSEED G-BLADE Overclocking 7Mh/s on: April 27, 2014, 04:00:34 PM
Hi wolfey,

I'll stay with the actual stable overclocking until I go back home in a few days as I'll have more hardware and components available to test.

For now, using cpuminer, it seems that some chips do want to go higher that 1075Mhz, and some do prefer 1025 or 1000.
I should have received some heatsinks the proper size at home for the gridseed chips, so I'll try it, just in case it helps a little.

I should also have from other projects most of the components needed to duplicate the powerboard.


As a side note, Zig and wolfey, your help is very much appreciated, but please stay on topic in the thread. Personal issues should be solved in PM.




908  Alternate cryptocurrencies / Mining (Altcoins) / Re: GRIDSEED G-BLADE Overclocking 7Mh/s on: April 26, 2014, 07:16:09 AM
Will this void the warranty?

Yes, and it'll most likely destroy your blade, so don't do it unless you know what you do and you are able to fix all the mess you could have done trying to improve.

I decided to try it because I was confident I'll be able to fix it or at least revert back to stock if anything went wrong.
Even knowing that, I only tried one PCB at a time
909  Alternate cryptocurrencies / Mining (Altcoins) / Re: Gridseed Blade | Damaged ferrite beads on: April 25, 2014, 04:49:20 PM
You'd better use 100w power supply for each blade to get some spare power.

As for replacing the components, hopefully, they are near the edge of the board, so less risks to mess something else.

If you are comfortable with soldering, 1206 SMD are quite easy to replace, even with a soldering iron.
easier with soldering station with regulated temperature.
Hot air station is overkill for those "big" SMD, and you have to be used to soldering with it.
910  Alternate cryptocurrencies / Mining (Altcoins) / Re: Gridseed Blade | Damaged ferrite beads on: April 25, 2014, 01:58:16 PM
Best choice will be to send the blade for replacement under warranty.
unless you know where the trouble came from in the first place, you'll probably face it again, even after replacing ferrite beads.

So, for the components,

C217 and C208 are capacitor, I'll have to check the tracks on my board to be sure which one they are.
I believe something around 22uF 25v 1206 size, but I really need to check since the schematic isn't the exact same as the G-Blade

FB28 is ferrite bead, 300ohm@100MHz,3A, 1206 size
FB29 is ferrite bead, 300ohm@100MHz,3A, 1206 size

I found same values FB on ebay for around 5 or 6$ each. should be available from digikey, mouser...
911  Alternate cryptocurrencies / Mining (Altcoins) / Re: GRIDSEED G-BLADE Overclocking 7Mh/s on: April 25, 2014, 01:37:22 PM


Yo, they've done infrared tests on the card, just like you wished for Wink
Have a look! http://cryptomining-blog.com/
Wolfey

Nice.
we can see that the 16v capacitor is also hot, but the ferrite beads aren't that bad.

So maybe double power line to feed the board can be done quite easily by duplicating the power board and connecting it to its outputs.
We need some input point to connect it, it would be much more easier if the board had some through hole components, but some places could be easy to connect to.

I might try a proto board in a week or so, I already have most of the components at home from other projects.

912  Alternate cryptocurrencies / Mining (Altcoins) / Re: GRIDSEED G-BLADE Overclocking 7Mh/s on: April 25, 2014, 08:20:45 AM
what about replacing the mosfets?

the twin ones are IR5300, the 90° flipped one however is a 5301

i made a table on Digikey with ones matchig the package type, sorted down by amperage:
HEXFETs

but someone who knows better should filter it down further by all that stuff like D2S, Vgs, Qg, Ciss etc pp...

Thanks for your help.

if we stick with PQFN package, this one should be fine with higher specs.

http://www.irf.com/product-info/datasheets/data/irfh7004pbf.pdf


@ GenTarkin , I still don't really understand how to make appropriate calculation on HW errors percentage.

here is tonight result



actually, 487 errors on 10 hours @ 7488kh/s with difficulty 2300

My math would be 487/(7488*1000*3600*10)*100 = 0.0018%
can someone please confirm my math is OK?
It should be ok if 1 HW error is actually 1 failed hash over thousands because of HW

It would be different if it was 1 failed good share because of HW, but how can you guess it is a good share if it failed?





913  Alternate cryptocurrencies / Mining (Altcoins) / Re: GRIDSEED G-BLADE Overclocking 7Mh/s on: April 24, 2014, 09:55:20 PM
last screencap for today.
1 hour @ 7.2Mh/s with 9 HW errors in the first 3 minutes, time for the board to warm up.
Looks stable but needs active cooling on the powerboards


914  Alternate cryptocurrencies / Mining (Altcoins) / Re: GRIDSEED G-BLADE Overclocking 7Mh/s on: April 24, 2014, 08:54:01 PM
42K resistor gives way less HW errors at 1063Mhz

7.3Mh/s seems to be the limit with the actual components on the powerboard.
Many components are getting really hot and need active cooling to work.

I'll try some improvements on the powerboard later, as suggested by wolfey.
For now, I'm happy with the results, but it's really a shame that Gridseed haven't designed a better powerboard to get the full potential from the chips.
915  Alternate cryptocurrencies / Mining (Altcoins) / Re: GRIDSEED G-BLADE Overclocking 7Mh/s on: April 24, 2014, 06:30:07 PM
Can you guess which one has the 42k resistor and which one still have the 39k?



The schematics for the blade is the 8 chip one from github.
At least, it's really close if it's not the good one.

Unfortunately, it seeems they have kept the same power board for the 40 chips blade that was supposed to be used for 8 chips, so not much room for overclocking.




916  Alternate cryptocurrencies / Mining (Altcoins) / Re: GRIDSEED G-BLADE Overclocking 7Mh/s on: April 24, 2014, 05:26:22 PM
I believe to run more than one blade per raspberry pi you need a powered USB strip and then I think I saw that it could really only handle 5 blade units. aka 10 boards. The question I have though is could I buy small copper heatsinks and possible longer standoffs. Assemble all this and have more overclocking headroom? Or is the volt mod required to hit those higher clocks?

You won't gain anything with better cooling, the fan blowing air over the chips seems to be enough, even when overclocked, they are warm at most.
Voltmod is required for real overclocking.

Hello J4! Nice work!
Have you read the latest over volt report at http://cryptomining-blog.com/ rel volt modding the new gridseed g-blade scrypt asic miner?
They are saying that the voltage regulators overheat easily at even 39k ohms but can be compensated with additional heat sink and fan. Still, the overcurrents will possibly cause them to release magic black smoke!
My first thought is to replace them with TO-220 type with separate fin type heat sinks to help them catch the wind of the main cooling fan, which also sounds like it can be under-volted to make it run quieter since it provide well more than enough air flow to begin with.
Let me know what you think.
Wolfey

Hey Wolfey,

The post wasn't there a few hours ago, but they are facing the exact same limitations as me, but they haven't noticed the ferrite beads overheating. Thermal picture wold be nice to identify where are the hot/weak spots.
I managed to get the blade stable for 25 minutes at 1125Mhz, giving 3800Kh/s for the panel with 47K resistor, but after that, it's overheating, even with a fan blowing directly on it and stops sending shares
It's actually running with very few hw errors at 1063Mhz with 42k resistor.

TO-220 package might be a good idea to replace the 09N03. Datasheet says 25V 50A, but power dissipation might be too low I'll have to check if I have an acceptable replacement when back home next week.
917  Bitcoin / Mining support / Re: Gridseed / burnt down on: April 24, 2014, 02:20:31 PM
According to Bill of Materials and schematics,

FB27 and FB28 are 300ohm@100MHz,3A Ferrite bsead, 1206 size

C201 and C203 are 22uf 6.3v capacitors, 0805 size
C204 is 0.1uF 25v capacitor, 0402 size
918  Alternate cryptocurrencies / Mining (Altcoins) / Re: GRIDSEED G-BLADE Overclocking 7Mh/s on: April 23, 2014, 08:48:04 PM
I believe to run more than one blade per raspberry pi you need a powered USB strip and then I think I saw that it could really only handle 5 blade units. aka 10 boards. The question I have though is could I buy small copper heatsinks and possible longer standoffs. Assemble all this and have more overclocking headroom? Or is the volt mod required to hit those higher clocks?

You won't gain anything with better cooling, the fan blowing air over the chips seems to be enough, even when overclocked, they are warm at most.
Voltmod is required for real overclocking.
919  Alternate cryptocurrencies / Mining (Altcoins) / Re: GRIDSEED G-BLADE Overclocking 7Mh/s on: April 23, 2014, 12:47:35 PM
Don't try this at home unless you know what you are doing.
Serious damages can happen and is not limited to you, your family, your G-Blade, your house.
I can't be held responsible for any damage that can happen if you try this voltmod. It's still in early stage of testing to improve stability and reduce overheating.

Here are more pics from the mod with 50K pot to go slowly on overvolting.
The 2 disassembled PCB


Here is a close up view of the place where the 33k resistor needs to be swapped.


And here is the wiring made plus a few comments on  blown components and overheating area.





One of the culprits for overheating might be the ferrite beads, I'll try to replace them with higher capacity ones that should be delivered soon.
Please note that the power connector will also be at its limits or a little over them when overvolting, so another component that needs to be replaced.




920  Bitcoin / Hardware / Re: MinerEU slow service on: April 21, 2014, 03:41:24 PM
[
What mod did you do?


voltmod same as on the 5chips pod, but with 39K resistor. Some components don't like 47K or 52K resistors.

I need to replace them before trying higher overclocking.

Been stable at 7Mh/s for around 48h now.

For some reasons, the post has been auto moved to the wrong section.

https://bitcointalk.org/index.php?topic=576784.0
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