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Author Topic: bad Block Erupter?  (Read 8313 times)
soy (OP)
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August 11, 2013, 02:14:11 PM
 #81

Code:
[2013-07-30 20:48:38] USB: AMU0 read1 buffering 4 extra bytes

^ was worse when I had something plugged into the Raspberry Pi hub next to the USB Eruptor. Ran ok for the few days. Now it's crapping out. Very hot to the touch but not sure how much. Have that basic included heatsink on the back but no fan. Don't want to put a fan on it really... noise...

What's the voltage between the ground pad (pad most distant from the heatsink hold down screw, call it pad 1) and pad 6?  Does that voltage vary?
soy (OP)
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August 11, 2013, 02:15:40 PM
 #82

Code:
[2013-07-30 20:48:38] USB: AMU0 read1 buffering 4 extra bytes

^ was worse when I had something plugged into the Raspberry Pi hub next to the USB Eruptor. Ran ok for the few days. Now it's crapping out. Very hot to the touch but not sure how much. Have that basic included heatsink on the back but no fan. Don't want to put a fan on it really... noise...

You do have a hub between the raspberry pi and the BE, correct?
soy (OP)
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August 11, 2013, 03:11:09 PM
Last edit: August 11, 2013, 04:28:37 PM by soy
 #83

How much have you spent trying to fix it? "Upgrade" or as you say what was the cost of all the "attempts to get stable operation"?

off the top of my head

copper pipe 1"diameter 2"length, less than a buck at Lowes I think, that was cut lengthwise, flattened, cut, nibbled and shape'd to have pads down on the CP2102 and ASIC then soldered to standoffs.

standoffs from Radio Shack, maybe a buck and a half

screws from Lowes to hold the new heatsink less than a buck per package at Lowes

small fan from a triple fan insert that would snap into a drive slot to exhaust heat, free from scrap

wall wart to drive fan free from scrap (actually fan is 12v so I'm using a 10watt step-up switching converter I bought years ago for under $10 between a lower voltage wall wart and the fan)

crystal from digikey, a buck or two plus shipping from Digikey

capacitors for crystal start up network free from scrap motherboard

replacement CP2102 as the original had a deep burn spot after mistakenly plugging a strong 12v wall wart supply into a new D-Link HUD7 hub, a buck or two from Digikey plus shipping (in the interim while the BE was down I used the D-Link on my main machine and was so impressed with the improved communication between my main machine and other gear, I'm likely leaving it there)

10uf tantalum capacitor across the USB Vbus (after reading USB3.0 and USB2.0 control chip datasheets, these are needed and perhaps the non-approved early USB2.0 CyberPower hub didn't have these on outputs) a buck or two from Radio Shack

Wish I had changed the CP2102 first off.  The BE has been running well for almost 3 days now on the CyberPower hub and Raspberry Pi.

soy

 I have a hot air desoldering station tweaked for the extra heat which I used to remove the CP2102 but you can't count that in the cost as I bought it anticipating I may have to change some FETs on a Jalapeno I may one day finally get after their pisspoor slow production.  I also bought a nice L/C meter for measuring components when I built a switching converter to bring a good sized Zenith laptop switching supply voltage down to 12v for my zTex 1.15x and used that meter to vet capacitors for the crystal start-up network.

I should note changing the CP2102 is a very delicate operation and I venture to say of those amateurs who attempt the change more than not will lose the BE completely.
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August 13, 2013, 02:04:25 AM
 #84

Must say, when they run right they're no hassle at all.
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September 16, 2013, 12:41:12 AM
 #85

Any ideas with this matter why they buffer on the raspberry pi and not my windows 7 device? All they do is buffer on it. I unplug and put in pc and they start chugging along.

Also at least one device is not recognized by cgminer. I did make sure to test without any other devices on the hub just to make sure it wasn't seeing a device and thinking it can mine.

Thanks

p.s I got mine from btc guild and they were sealed as far as a sticker on the box with no tampering (the little white box you can't get open without showing some tampering when you open it Wink )

Like the info address for potential tips Wink
BTC 1CL5BnNhdL2wDVmSDwMbW1cNhZew87CAPV
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