Reserved for tech stuff. UPDATED FEBRUARY 2017 First tech tip:
0) Neptune controller boards can work with Rpi and the bridgeboards for Titan miners. They are the same controller board.
0) Neptune BeagleBone Black CPUs can now work with KNC Titans. We figured it all out on pages 28-30, it takes time but it can be done.
0) I managed to hack the KNC Titan code so it can run on a Neptune BBB. Link is at:https://www.dropbox.com/s/xtklnmk88p799bq/knc-lightfoot.7z?dl=0
You need a 32gb SD card, use admin/admin to log into the web page. This was a lot of work, feel free to donate.
1) If the controller board isn't seeing the miners it might be because one of the capacitors on the TPS chip's power rails is shorted out. This seems to happen, might be crappy caps or something else. Regardless there are three power rails feeding the FPGA and if one of them has a shorted cap the controller will refuse to turn on the FPGA.
* A second problem is a blown FPGA. This seems to happen a fair bit, however the BGA chip can be replaced, and I can do this as well.
A good way to spot this is to watch the bright LED on the side of the control board. If it comes on bright during boot then goes out, the TPS chip is probably good. If it comes on a quick flash, off, on, off, on, off then the FPGA chip is probably shorted. Send it in I can fix this.
See page 3 or so for a nice set of pics on how I fixed this.
1a) I can fix the following Titan issues:
Blown bridgeboards for KNC Titans
Blown power connectors on Titan cubes
Incinerated power connectors on Titan cubes
Cubes that short out the 12 volt power supply
Cubes that shoot fire out the back of them
(These usually wind up shorting out the 12v supply)
If your Titan has one die, I can try to get it to 3-4 dies
If your Titan comes up with no hashing but can be seen in KNCminer, I can fix it
If your bridgeboard is dead, I can fix it but you have to replace your Rpi too.
If your Rpi is dead, just get a new one and power it via the USB port. Lazy but works.
Any and all controller problems (reboot, etc)
Little displays that don't display anymore (sometimes)
2) If fire is pouring out of your miner like molten lava through a jungle village you might have run the DC-DC supplies a bit too hot and set fire to the capacitors. Replace them with 22-24uf caps and try to keep the DC-DC temps below 60c or so. Given the lack of airflow over them and that weird-ass insulated blanket thing on top of them, that would be a good idea.I can fix this.
3) I've been able to get many blown boards up to what I would consider to be full power (600gh, <300 watts) not too bad. Do have to trim a bit since one of the power supplies runs a tad bit hotter, and the other unit is currently cooled by a water block. Weird.
4) If you're nutty enough to overvolt/overclock your Neptune or Titan here is a very important tip: NEVER MOVE IT WHILE RUNNING OR HOT. Power it off, wait 15 minutes for it to cool, then move it around. Why? Because the chip can get so hot it is softening the solder underneath it. Moving it with that huge heat sink can squish the solder into short-ville. Bye bye unit.
5) Never plug or unplug the molex thing from a running power supply. Always power off the supply then plug it in or unplug it. Why? Because all the caps on the power supplies will cause a powered molex to SPARK and damage the plug. Then it overheats and you feel the burn.... If you see your molex plug is discolored, has burned pins, or is a charred hunk of wreckage, drop me a line:I can fix this.
6) If you have blown Neptunes or Titans and want me to look at them, let me know. Getting pretty good at this, I can now fix shorted Titans and Neptunes that don't talk to the controller. Rates are reasonable in bitcoin :-)
7) If you think your beaglebone is screwed, check the bottom of the board while powering on. The left LED should come on then the right LEDs should flash in a nice little show. No right lights, no booting. If they don't boot try re-installing the KNC firmware. If that doesn't work reflash it with a stock debian build then re-install the KNC firmware.I can fix this.
I did have one BB that would not come up but made a high pitched whine on power up. Turns out putting a micro-SD card cleared this and allowed boot. Turns out DPO (dreaded previous owner) must have picked up the board and pressed down on the SD interface pins, bending one to short power to ground. Don't do that :-)
9) Both Titans and Neptunes seem to have "islands of stability" in terms of frequency and voltage. For example 350/450/450/450 at -.3v will yield a solid 600gh, but backing down to a 200/450/450/450 will cause the first pair of supplies to stop putting in current. Weird, but happens on several cubes and several controllers so this is not a fluke.
Run your Titans at 250mhz per die max. Really, the diff between 60 and 80mh is where the death zone is.
10) Never unplug the 10 pin connector from the controller or cube while power is applied. Always shut everything down. When plugging in the cables make sure they are on top of all 10 pins in the Titan and oriented properly. Doing this wrong blows up the cube and controller and yes, I can fix this
More to come. Donations of parts and junk welcome.