J4bberwock (OP)
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May 24, 2014, 10:14:27 AM |
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I've also blown a mosfet on one of my blades, as usual, it's the upper gate one that is alone. I suspect that shrinking the design from 2 upper + 2 lower to 1 upper + 2 lower fet puts stress on the single when overclocked. I'll solder a replacement one tomorrow. IRFH7004 doesn't seem to work in this place or something else is shorted. I'll try irfb7437 that is proved working on a pod or I'll replace with the newer components used by gridseed as I have some. experiments so far:
Upper gate, pin 19 -> 5302 or CSD16321 or irfb7437 (works on pod) irfh7004 doesn't work on blade? Lower gate, pin 2 -> dual 5300 or dual CSD 17556
I've found alternate soldering points on the blade for the gate of lower fets that will make experiments easier with fets soldered outside of the blade
update on the blade, I can confirm that irfh7004 don't work on upper gate when you have dual 5300 on lower gate. but CSD16321 works with dual 5300 on lower gate. I received a pod with this configuration, and I tried it on the blade. It's happily hashing again. next step will be external quad parallel fets on each gate to feed the up1509 before trying complete external powerboard thaqt could be piggybacked to a blade we still need a good TO-220 candidate for lower gate as a side note, if you do replace the power plug with screw terminal like me, put them on the back of the board, that will allow for more space to solder the upper gate mosfet when it will die. I've melted half the screw terminal with my hot air station when desoldering and resoldering the fet. It will also be easier to screw/unscrew.
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Blisk
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May 24, 2014, 11:15:49 AM |
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great I will also check which can be good replace for lower gate. Don't know what you mean with... I've melted half the screw terminal with my hot air station when desoldering and resoldering the fet. It will also be easier to screw/unscrew.
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J4bberwock (OP)
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May 24, 2014, 05:14:49 PM |
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great I will also check which can be good replace for lower gate. Don't know what you mean with... I've melted half the screw terminal with my hot air station when desoldering and resoldering the fet. It will also be easier to screw/unscrew. I will add pics. As far as I now understand the mosfet used with the buck converter, you need lower Rdson for the lower gate ones, and higher Rdson for the higher gate one(s) 5300 is 1.3mohm (dual lower gate) CSD17556 is 1.4mohm ( lower gate) 5301 is 1.85mohm (some of you have seen it instead of the 5002 higher gate) 5302 is 2.1mohm (single higher gate) CSD16321 is 2.4mohm ( higherr gate) 7437 is 2.0mohm, that's why it works as replacement for 5302 7430 is 1.4mohm with TO-220 package. it should work as the lower gate with either 5302 or 7437 as the higher gate 7004 is 1.4mohm, should work as lower gate, that's why it wasn't working when I put it in place of 5302 (blown higher gate) The last one I'm still waiting for delivery is 1404 with 4.0mohm rdson. it should work ok as a higher gate. So I have 2 options 1404 higher gate and 7437 lower gate (lowest rdson) ordering 7430 to have 7437 higher gate and 7430 lower gate
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Blisk
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May 24, 2014, 09:06:29 PM |
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so I already got IRFB7437 and I am waiting to get 1404 and that should work?
let me know if you test it if it works. I need first to find out why my blades stops to mine after that I will change mosfets.
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J4bberwock (OP)
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May 24, 2014, 10:13:55 PM |
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so I already got IRFB7437 and I am waiting to get 1404 and that should work?
let me know if you test it if it works. I need first to find out why my blades stops to mine after that I will change mosfets.
irfb7437 and 1404 could work. 7437 and 7430 should work, I can't see any reasion they won't, but I'm not an electronics guru, just experimenting and learning very fast. if your blades stop with cpuminer too, it should be hardware related. try at least to cool the 3 mosfets over their junction temperature, they do stop to work and the blade stops hashing. If you have the libusb error with cgminer, direct connecting to the computer with a short usb cable, could help too. irfb7430 ordered, I should receive them next week. In the meantime, I'll prepare a board to fast swap the to-220 mosfets and post a few pics of the easiest soldering points for upper and lower gates external fets I'll also look for good solder points for a complete external powerboard.
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J4bberwock (OP)
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May 25, 2014, 07:54:07 AM |
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so I already got IRFB7437 and I am waiting to get 1404 and that should work?
let me know if you test it if it works. I need first to find out why my blades stops to mine after that I will change mosfets.
regarding your trouble with blade stopping to send shares, I also have similar trouble when for some reasons the fan stops to work. mosfets overheating, and closing.
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evocoins
Newbie
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Activity: 9
Merit: 0
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May 25, 2014, 08:01:44 AM |
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I haven't got any problems with my two Gridseed's I bought three weeks ago from monster-asic.com. Fans working fine, no problem here. But yes, 7 MH is a bit optimistic, I managed to get mine to 6.5 MH
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Blisk
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May 25, 2014, 08:29:16 AM |
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No fan works fully and I even tried with hand how hot board is but not that hot. I assume maybe can be a power plug, one stops to work something is disconnected in it. After a while and high current maybe connection broke, I will see tomorrow I will change it. Because it is no reason why after more than one month working with no problems suddenly not working anymore
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J4bberwock (OP)
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May 25, 2014, 11:32:29 AM |
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No fan works fully and I even tried with hand how hot board is but not that hot. I assume maybe can be a power plug, one stops to work something is disconnected in it. After a while and high current maybe connection broke, I will see tomorrow I will change it. Because it is no reason why after more than one month working with no problems suddenly not working anymore
Could be MOSFET or main capacitor wearing. The powerboard is already close to the limits, even non overclocked.
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Blisk
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May 25, 2014, 01:11:51 PM Last edit: May 25, 2014, 06:01:37 PM by Blisk |
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I think I found out the problem. I read on some froum that COM ports over 10 can be problem, so I put my Blades under 10 com ports and I will see.
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J4bberwock (OP)
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May 25, 2014, 06:17:21 PM |
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I think I found out the problem. I read on some froum that COM ports over 10 can be problem, so I put my Blades under 10 com ports and I will see.
com70/71 here
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Blisk
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May 25, 2014, 06:29:07 PM |
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I think I found out the problem. I read on some froum that COM ports over 10 can be problem, so I put my Blades under 10 com ports and I will see.
com70/71 here I changed ports and will see if that works. Because really com prots are the only thing I changed on it.
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Blisk
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May 25, 2014, 07:58:50 PM |
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It's not that, blades stops to work again
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J4bberwock (OP)
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May 26, 2014, 07:00:29 AM |
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It's not that, blades stops to work again
what is the exact error? cpuminer still working but no share sent at all? at least, add the timeout command --gc3355-timeout=120 it will restart the blades if no shares sent in 120 seconds so less money lost here is my commandline minerd-gc3355 --no-refresh --gc3355-timeout=120 --log --gc3355=\\.\COM71,\\.\COM70 -c config.json the config.json file have the pools and frequency settings and it looks like it needs to be named like this.
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Blisk
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May 26, 2014, 07:15:13 AM |
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thanks didn't know about timeout. Yes cgminer works but no shares what do you have in config.json?
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J4bberwock (OP)
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May 26, 2014, 08:10:11 AM |
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thanks didn't know about timeout. Yes cgminer works but no shares what do you have in config.json?
here is the json file first pool is main pool. everything after will be backup pools { "gc3355" : [ "\\\\.\\COM71", "\\\\.\\COM70" ], "pools" : [ { "url" : "stratum+tcp://eu2.multipool.us:7777", "user" : " ", "pass" : "x" }, { "url" : "stratum+tcp://eu.multipool.us:7777", "user" : " ", "pass" : "x" } ], "freq" : "1063"
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styson
Newbie
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Activity: 20
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May 26, 2014, 08:35:30 AM |
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Can you please give me the values for the 2 small capacitors by the power connector on the Blade, they are next to the 3 Ferrite beads ?
Thanks,
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J4bberwock (OP)
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May 26, 2014, 09:20:44 AM |
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Can you please give me the values for the 2 small capacitors by the power connector on the Blade, they are next to the 3 Ferrite beads ?
Thanks,
it you are looking for the 2 little ones between the 3 ferrites and the 2 bigger capacitors, they should be c9 and c10 from 8 chips schematics 10uF 6.3v 0603 size
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styson
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May 26, 2014, 10:22:44 AM Last edit: May 26, 2014, 11:21:02 AM by styson |
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Lost them while busy trying to find a short on the board, 3 Ferrites were blown and the FET is shorted !!! Waiting for replacement FET's now.
Thanks J4bberwock
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Blisk
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May 26, 2014, 11:37:02 AM |
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J4bberwock Thanks I asked for setting for com ports I changed today power plugs and for now looks like it works ok.
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