Quote from: TheSchwartz on May 20, 2014, 11:34:29 PM

I just installed the newer version of bfgminer and everything seems to be working fine. I'm using a 2A usb powered hub, so that's my problem. i will have to wait until i can order the eyeboot 49 port hub with 40A, then I will order more NF2s.

I am doing a little testing now with everything working as it should be, but chip a on one of the NF2s doesn't seem to be getting read. It just says 0.0 / 0.0 / 0.0 h/s, and when I hit the down arrow to go to chip b, it reads as normal. Does anyone know why it might not be reading something on that first chip? Is it something wrong with the NF2 itself or what? thanks

I did read the other responses prior to this quote, in the meantime, If you feel brave, I have some options that may point out the issue and eliminate power as an issue. I had to do some similar troubbleshooting on my own equipment and antminers/erupters/etc that turned out to be the hub and power as issues so it's similar.

If you can find a HDD to fan type connector ( cheap 12V powered from HDD passthrough fans ) and make a jumper to your hub ( cut off at the fan for length of cable and doubble check which is power, which is ground ). MOST ( not all ) power connections at USB Hubs have center pin positive. I took one of them and desoldered the power connection and found that it's outer power on mine. I also found a ' flake ' of solder AT the pins of the USB Hub IC ( 1 to 7 hub IC after a 1 to 4 hub IC ) keeping the D+ and D- on one port shorted to each other ( no detect anything on that plug until it was cleaned, lucked out it didn't kill the IC or that port ).
I CUT the 5V line for the USB cable ON the board ( and long enough to undo if needed ) so I wouldn't power the PC from the hub.

I did a similar mod for a 7 port hub but with a wireless router power adapter as it was rated at 5V @ 2.5A DC.
Some other posts recomend signal diodes for the 5V USB cable to the modded hubs to prevent power going back in to the PC or causing issues. If you keep all grounds as ground ( no floating voltages, and ground from everything eventually hits the pc power supply ground ) everything should be ok.

I also checked the hubs' caps ( yes, there are 4 capacitors in one of my hubs ) and replaced them all for higher rating ( moved to 16V 2200 Uf from the 6v 1000 Uf ones ) and the other hub didn't have any on the power line except the ones at the Hub IC ( to clean power ). Hope this helps someone out there

and good luck mining!

nybbler905

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