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So guys i was thinking about getting myself a usb block erupters and mine, any idea what the hashrate of a single erupter is in comparison with r290 graphics card?
You are looking at the wrong coin to use a block erupter. http://www.quarkcoins.com/mining-quarkcoin.htmlBy all means, mine quark on your CPU while mining some other sha256 coin on the block erupter. |
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Here is the newer larger PSU next to the old one. looks like its still made by the same company though so it's probably shit. 12v 10 amp. The wires do look thicker coming out of it and it has a 90 degree connector on the end.  |
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Yeah you're right I'm looking for the 7.2 version
It's gone. ahh lols, watch the freakout now |
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Really? Can you take a pic of the newer PS?
C
yeah sure, will do tonight when i get home. |
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This one that blew up had the older style chips. no 5v at the 5v test point.
Out of curiosity I checked my other Jally that has two of the new style of chip. That one has 5v present at the 5v test point.
Hm. I've seen that too. My weird jally didn't have 5 volts but it seems to be running well now. Maybe they put it in sometimes. I think i'll just RMA it.
I have 5 ASIC chips on the way so i'll pop 3 on the replacement and two on my other one. (this is how i came accross this thread in the first place. I remembered the post with the blown u15 pics)
That sounds best. I've got 4 chips outside in the mailbox I think; I'll put one of them on my weird jally, taking it to 5 and the other on my other new jally taking it to six on an old-style heat sink. I think that might wind up being a problem, but my water block is not coming till Monday at the earliest. And I get to look at another blown board. Fun! Speaking of chip placements, put another one on a 2 chip jally for a friend, no problems. I'm actually waiting 5 minutes with preheat now, until I see the faint wisp of smoke/flux come up, then a count to 90 with the air tool at 450c. The hardest part is placing the chip perfectly on the balls, but I have had a 100% success rate since I started using a loupe to verify all the balls. C well dragging up an old post, I got my RMA replacements today. Pretty happy with BFL as they gave me two 10ghs 3 chip units with 1.2.9FW rather than two 5ghs! makes up for the stupid international prices Australia post charges. Also regarding the power supply comments earlier on, i got one of the usual 13v 6 amp shit power supplies with one unit, but the other came with a massive 12v 10 amp supply that is about double the size of the other (and has an earth pin too) And they show up as BAL's rather than BAJ's in cgminer. Looks like BFL have been silently studying and taking notice of what this community is doing. |
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nice summary, you have inspired me to do a 4 and a 5 chip jally.
or maybe a 3 and a 6 :-)
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Have these been snapped up or are some still available beastlymac?
Yes these are still available. They will arrive to me on Monday. so just to clarify, this is ok for U1's, even though the 1st post says the groupbuy closed 4th Jan? |
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On another side note I finished reviewing a blown board that was given to me which had a complete blow-out of the 1 volt FETs due to a short.
Micro-summary: It's destroyed. Not because of the FETs; I got those off easily and cleared the shorted 1 volt lines. It's the fact that the whole 3.3 volt line is shorted as well; I was trying to figure out where that went bad and found out there was a nice bubble in the board by the chips. Apparently the 1 volt line not only shorted but it burned inside the board, shorting the 3 volt supply to ground.
Not good :-) So if you blow the FETs, repairs would require board-level digging, not something I would do for a $200 part. I may fiddle with it some more, but for the moment I will classify this as "toast". :-)
C
To be honest I contribute a lot of that to the tightly packed nature of the board. If anything blows it has a high chance of taking something else close-by with it. glad I didn't try and fix my 3.3v shorted one. |
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BADASS  Just out of curiosity, do both new and old style asic chips go on with the same technique? do you have to vary it between the two? |
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This one that blew up had the older style chips. no 5v at the 5v test point.
Out of curiosity I checked my other Jally that has two of the new style of chip. That one has 5v present at the 5v test point.
I think i'll just RMA it.
Thankyou for all your help anyway.
I have 5 ASIC chips on the way so i'll pop 3 on the replacement and two on my other one. (this is how i came accross this thread in the first place. I remembered the post with the blown u15 pics)
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Hm, yep that's the 4 amp 3.3 volt power supply. Out of curiosity what happens when you plug it in now?
Do you have a volt meter and know how to use it? I'd be really curious to see if the 1 volt power line is up; it feeds off the 12 volt supply line. If that's working and the 3.3 volt short could be cleared you could power the board up with a small bench supply and it might work again. But man that is a serious hack.
Speaking of serious hacks, I have a board coming in with a blown set of 1 volt FETs. I'm going to try powering it off the danger board with jumper wires; technically it might work. Then again the voltage drop might be too much but what the heck?
:-) Keeps me out of trouble.
C
I just get the red light near the power connector, none of the other LED's light up at the front or back. I have a multimeter to test with. I just need to know where to test. I haven't had a chance to look at the board layout and see what is what. I'ts certainly the most tightly packed board I have ever had to look at. It's not too bad. Grab the schematics by googling for sc-mainboard-1.0, it's a PDF from BFL. Once opened take a look at the board layout. On the opposite side from the power plug (top side) you will see a square hole, then a space, then five more holes. Right by the JTAG port. Those are the voltage test points. They are: ground 1-volt 3.3-volts 5.0-volts 12 volts. All reference to ground. See what you find with the board plugged in. C Ahh I see, they cut the board so close to those test points the silkscreen of gnd, 1v etc is missing. OK at the test points I have: 1.01V, 0.0001V, 0V, 13.1V should I have 5v? Resistance between ground and: 1v = 41ohm 3.3v = 0.20 ohm 5v = 2.9k ohm 12V = 2k ohm It's hard to tell if this is the burnt out u15 chip causing the short or something else as well causing this. If Mr Teal thinks it might be hard to diagnose then it might not be worth removing u15 and RMA'ing instead. |
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Thanks C,
I'll test it when I get home tonight.
'spose i'll asses from there and see if I want to try fixing it myself or not.
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Hm, yep that's the 4 amp 3.3 volt power supply. Out of curiosity what happens when you plug it in now?
Do you have a volt meter and know how to use it? I'd be really curious to see if the 1 volt power line is up; it feeds off the 12 volt supply line. If that's working and the 3.3 volt short could be cleared you could power the board up with a small bench supply and it might work again. But man that is a serious hack.
Speaking of serious hacks, I have a board coming in with a blown set of 1 volt FETs. I'm going to try powering it off the danger board with jumper wires; technically it might work. Then again the voltage drop might be too much but what the heck?
:-) Keeps me out of trouble.
C
I just get the red light near the power connector, none of the other LED's light up at the front or back. I have a multimeter to test with. I just need to know where to test. I haven't had a chance to look at the board layout and see what is what. I'ts certainly the most tightly packed board I have ever had to look at. |
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You blew up U15 as well? Hm, interesting; wonder why that is failing.
I think that is the 3.3 volt supply line, if you want to send it over I can take a look at it. I'm sure though they will honor the RMA. Drug, did swapping that chip fix it?
C
Thanks for the offer. I'm in Australia though so probably not worth it for me. I think u15 blew because I recently changed to an ATX power supply rather than the power brick (all in effort to prevent something like this from happening.) The sparks came as soon as I un-plugged and re-plugged in the USB cable while trying to get rid of "unresponsive asic" messages in cgminer. For next time I'm considering wiring in a 30v 6A Poly switch that I have here or maybe a fuse. Thanks everyone else for the suggestions. I don't have a current limited power supply so this might be a bit too hard to fix myself. My main issue now is if BFL will try and fix it before sending me a new one. If so they might see that I reflashed to get to 7.8gh/s |
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Wait, that chip you blew up is a voltage regulator? I thought the six FETs were it, or is that some sort of LM317 for the fans?
And is that big box thing damaged as well?
C
Yes, notice the hole in the chip. The number on it was ST1S10, on mouser it comes up as a voltage reg. This particular jala is the one that took out the same power supply. When I used a good power supply it blew that chip.... doesn't necessarily mean that's the problem though.... The blown caps are on the blocks DC output side, everything else looks fine. I'm not sure what you mean by big box thing? If you mean the USB controller chip, I ordered a couple. I have 2 jala's that wont register in windows... trust me I researched it on two PC's and 3 different miner programs. Again everything is just to the best of my knowledge, I'm out on a string with some of this stuff. The 2 mouser chips I got ordered are ST1S10 (Voltage reg) FT232HQ (FTDI driver chip for USB) Yes I'm in the USA unfortunately. Bugga, I just blew a hole in the exact same chip in the exact same spot. I thought it was new years eve fireworks again. Power supply tests ok though. the thing powers up with one red led near the power connector. The red leds on the back and front don't light up anymore. Torn between sending back as an RMA, or having a go at replacing the chip myself. |
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I brought 830 of these yesterday, maybe i should buy some more?
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DHwpux5CJXXf72LbV1PpZjbKuzGeTcoHMV
Thanks, hope I'm not too late!
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Qb7roxfUqGebkv5phRnQ3ebeYo8otsZcR4
hmm, looks like this address is going to take a while to fill.
are there any free giveaways ot faucets at the moment?
The pool says with my 670KH/s i'll only get 37 coins a day worth 0.005 btc.
is it really going to be worth something one day?
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I fell asleep and when I woke up I had a second board go dead on me. It doesn't power up anymore. Not sure what to do.
Chad
I guess the only thing that you can do now is to completely disconnect that board, let it cool down (edit: letting the polyswitches reset themselves, if they exist, sounds like a good idea), then try it again (ideally in an isolated environment with its own supply, pc etc.). Do you have reasonable cooling? Good luck Right now the ambient temp is close to 0C. The board is ice cold, but doesn't power up anymore. It was sharing a 120mm fan with a second board. Chad Bugger. i'd give it at least a few hours before declaring it totally dead. |
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hmm, almost sounds like polyswitches tripping with all the dead boards.
Are there any polyswitches on these boards?
if so , anyone with a dead looking board try it again in the morning and see if it works.
Lets hope the assembly company didn't go ahead and use those cheap components anyway instead of the real ones..
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