Topic: GRIDSEED G-BLADE Overclocking 7Mh/s, improvements and repair - page 11. (Read 74150 times)

I had the same problem until i use old cpuminer, after that it works.
Before after that fev hours hashing drops to some Khash

Just try cgminer...working fine for me...no problems...long term...

ZiG

Thanks but it didn't work.  What's the equivalent of that in BFGminer's .bat file?

I tried something similar, (displayed later in this response), but it fails with "Unexpected extra command line argument".
This is my failing batch file with BFGminer in a Windows CMD prompt with the following in a .bat file:
bfgminer.exe -S noauto -S gridseed:all --gridseed-options=baud=115200,freq=838,chips=40,modules=1 –-hotplug=5 --scrypt -o stratum+tcp://gridseed.wemineltc.com:3333 -u testworker.1 -p 123 --failover-only -o stratum+tcp://stratum.scryptguild.com:3333 -u testworker.1 -p 123.

BFGminer doesn't like the "--gridseed-options=baud=115200,freq=838,chips=40,modules=1 –-hotplug=5" portion.  It fails & terminates with with "Unexpected extra command line argument".

But this works in a .bat file:
bfgminer.exe -S noauto -S gridseed:all --scrypt -o stratum+tcp://gridseed.wemineltc.com:3333 -u testworker.1 -p 123 --failover-only -o stratum+tcp://stratum.scryptguild.com:3333 -u testworker.1 -p 123.  But this won't hash above 8MH/s.

My problem is that they don't go above 3.5MH/s with this string even though they are supposed to hit a minimum of 5.2MH/s.  Not seeing this.  Getting a top hashing of 6-7MH/s with both G-blades.

Under my Raspberry Pi Model-B I get 11-12Mh/s, minimal HW errors but the hashing on there last about 30 minutes before it all comes to a crawling 720KH/s.  Needless to say which is why I'm trying this under windows 7 SP1 now.  I tried getting them to work with Multiminer v3.2.2 but the best I got was also between 5-6MH/s.
So now I'm trying to get this to work from the Window CMD prompt.
Once I can past the basic stuff working stable, then I want to get to mod the crap out of these G-blades.


So that's why I was asking if I could get someone to display either their BFGminer.conf file, preferably under v4.2.0 or their CGminer.

I am using just plain ".bat" file ...like this...?

cgminer.exe --scrypt -o stratum+tcp://usa.wemineltc.com:3336 -u YOURUSER -p YOURPASS --gridseed-options=baud=230400 --gridseed-options per_chip_stats=1, freq=838,chips=40 --hotplug 5

Hope it helps...

ZiG

Does anyone have a good working bfgminer.conf or CGminer.conf they wish to share for stock G-blades that'll work under Windows?
Thanks.

Sounds like a desperate attempt to sell over hyped modded blades for still TOO MUCH money per MHs!

So now are these the same g-blades that we all have or a new product?

http://zoomhash.com/collections/top-sellers/products/26-4mhs-of-overclocked-g-blades-at-your-door-within-5-business-days

Here is a step by step checking you can easily do with a multimeter.

Start with the panel unplugged from power.

Step 1
Check for resistance between the gate and drain from the upper mosfet.
Yours shouldn't be shorted since your ferrites are looking ok.
You can check this post for the test done on a pod
https://bitcointalksearch.org/topic/m.6722468

Step 2
Check for what resistor they used for the voltmod.
Anything over 36k would have needed at the very least a dissipator under the panel to cool the power mosfets AQ6 AQ7 AQ8 an the choke AL2.
heatsinks over these parts would help too.
Secondary side fan is even better.

Connect the power plug to the panel.

Check if the coil and mowfets are getting warm/hot.
If they do, the chips should be warm too.
That means the panel should be able to hash, so something is wrong in the communication side. I haven't experimented that much on this yet.

If they stay cold, we will try to find out why in the next steps.

Step 3
Check voltage across any of the big yellow capacitors. They have positive and negative markings. It's what powers the gridseed chips for hashing.
Less than 1.2v means we have something wrong with the up1509 and related parts.

Step 4
check for +5v supply (output of the up1707Q)
This buck converter will feed the AME8805 (next step) and the up1509.

Step 5
Check for 3.3v supply (output of the AME8805AEFT chips, wrong spelling in the schematics from Gridseed)
3.3v supply to the mining chips.

If you have access to a multimeter, you can check a few things. I'll take your picture and add marks on it to tell you where to connect and what you should be reading.

nothing obvious on the picture except the solder job was done with a fine tip iron and isn't pretty, but it should do the job.
They also lack the heatsink on the mosfets and probably under the PCB.

If you have access to alternate power cables or power supply, try it, just in case the connectors were low grade and heated up to the point they damaged themselves.

Thanks for your help. Here is a high-res photo of the pcb area behind the connector. I didn't mod it myself, I got it from Zoomhash and I'm under the impression that 7gnomes did the volt mod.
The clicking seems to come from the DC jack... I can sort of feel it vibrating the DC connector when I connect it to the pcb jack. Hopefully this photo reveals something. Thanks again.

Clicking on the pods was related to the crystal.

Have you voltmodded them yourself? If so, try to revert back to check if the panel will hash again.
Apart for the cooling improvements, is there anything else than the resistor that was changed?
High quality pic of the power board could help to see something.

Can anyone speculate on this? One of my overclocked blades won't mine on one of the two panels. There is a rapid "clicking" sound now when i connect the DC connector to it, after a couple of minute the sound goes away. Does this usually indicate something? Thanks.

Lol those are exacly the same heatsink I've used for modding my blade, from the same seller too  

I was interested for a hot air rework station and I'll give a look to your BAKKU 858D, as for soldering station I lately prefer the one's with self-regulating cartridge like Metcal ( only downside is that it's pretty pricey gear).
Anyway nice list, thanks for sharing 

stock is 92mm

Here we go for the list

Hardware and related used

I don't work with magnifying glasses, but with headlamp. If yo do need a lots of contrast like me, this one is really nice and throws loads of light and is cheap. Maybe cheaper on some other places.

http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=290990217612&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

small tweezers will help for placing the smd too, something like these ones.
http://www.ebay.fr/itm/6PCS-Brucelles-Pincette-Pince-Tweezers-Antistatique-Metal-Courbe-Rond-Droit-/121204738469?pt=FR_YO_MaisonJardin_Outils_OutilsaMain&hash=item1c385d89a5[/b]]http://www.ebay.fr/itm/6PCS-Brucelles-Pincette-Pince-Tweezers-Antistatique-Metal-Courbe-Rond-Droit-/121204738469?pt=FR_YO_MaisonJardin_Outils_OutilsaMain&hash=item1c385d89a5

Soldering paste ZJ-18 one of the best cheap ones I tried so far.
http://www.ebay.fr/itm/Welding-Soldering-Iron-Solder-Flux-Paste-ZJ-18-50g-Wax-/220645967363?pt=UK_Home_Garden_PowerTools_SM&hash=item335f864603

Soldering station
Aoyue 937+ very good not so expensive one

Hot air rework station
BAKKU 858D
Cheap, but does the job.
My settings aren't the best ones, but they do work:
450°C (I know, it's way too high, but it allows me to work very fast)
Don't run the fan too high. 1 or 2 is enough most of the time. 5 will blow the 0402 and most of the 0603 SMD components off the board. Did I say not to go up to 8?

Standard mod
Resistors 0603 size 39k recommended, 43k is hardcore and dangerous, I'm running 44.2k.
can be found at mouser, farnell...

Heatsinks for cooling the mosfets under the PCB
37x37x15mm
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=261310293222&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
or 37x37x24mm (still waiting for them 5 weeks after puchase...)
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=310945950478&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

small heatsinks for cooling the mosfets on the top side
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=251251434021&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

Optional improvements

Replace the power plug with a screw terminal, 5mm pitch
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=400667113340&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
I had to slightly bend the pins of the terminal and drill the stock holes to 1.1mm

Replace ferrite beads with 0 ohm resistors, 1206 size
Axial ferrite beads might be better for safety, or resettable fuses. I ordered some and will test.

Replace Mosfets with new ones
Upper gate -> CSD16321Q5C one for each PCB unless you have the latest ones with an empty mosfet pad that you can populate.
http://www.mouser.fr/ProductDetail/Texas-Instruments/CSD16321Q5C/?qs=/qzd9s%252bcLd6BJ6oSO2jYyA==
TO-220 package IRFB7437 will also work with a nice AAVID thermaloy HF20 heatsink
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=360922735855&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Lower gate -> CSD17556Q5B you will need 2 of them on each PCB
http://www.mouser.fr/ProductDetail/Texas-Instruments/CSD17556Q5B/?qs=%2fha2pyFadujmDrK04JvA9%2fUT5iDlW7l0ImBsWKDB2WI%3d

add heatsinks on the GC3355 chips will help getting lower HW errors.
same one used on the mosfets


Optional wide body mod

Scythe ultrakaze 130CFM fan
You will need to figure a way to attach it to the blade. I glued some 15mm M3 spacers at appropriate place to be able to screw it.

25mm PCB standoff / spacers to make the original ones higher
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=281207608483&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

Custom cut PVC cards to close the gap between the 2 halves of the blade size 220x120x3mm
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=261480101060&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649


My recommended power supply (I currently own 15 of those at home, counting a few spare ones)

Server power supply, 1300watt if powered with 220-230V

HP DL580 G3 / ML570 G3 power supply 364360-001 / 337867-001 337867-501 AA23530
Quite easy to mod, reliable, not too expensive, powerful, but loud as a vacuum cleaner.

thank you it will be much appreciated

Thanks for the info.

You wouldn't happen to know what size these fan are would you.
I was hoping to see if COUGAR had any since I installed these on my S1 Antminers & I can't even tell 8 of them are on in the same room.  The ones I bought made from COUGAR are model CF-V12HP Vortex Hydro-Dynamic-Bearing 120mm 70CFM rating.

Thanks again.

Most of the fans you will find will come with 3 or 4 pins connector. You will have to keep only the black and red ones.
As for stock size, sorry, I upgraded to bigger one, Scythe ultrakaze.

I used this to choose mine

http://www.frozencpu.com/cat/l2/g36/c435/list/p1/Fans-12_Volt_Fans_by_CFM.html

The stock one is around 60cfm, don't go too low