Topic: Hacking KNC Titan / Jupiter / Neptune miners back to life. Why not? - page 31. (Read 76590 times)

What do you mean "full power" .... -0.0366v stock setting?
If so, 275mhz at that voltage would cause no harm, extremely inefficient but harmless.
Its running -0.0366v or HIGHER at 325mhz on all dies in a single cube which is dangerously close to meltdown of those connectors.

Meantime I got these pictures in. This is a Titan with both jumpers in place:



I know this had all cores running at full blast because you can't set a power plug on fire like this...



With anything less than a full component of hashing power. :-)

Side note: Do you really need to run at full power? 275mhz isn't that bad....

It's a 0 ohm jumper. Usually you put those in if you want to isolate something during testing or production. You can also see some around the Titan chip itself, look for a pair of traces that have a jumper, then a jumper on the trace next to them. That I think is the signal lines to the chip, those other jumpers we're talking about go to a 3.3v vcc2 supply from the controller board, common bussed.

It's never as easy as we wish :-)

Well this is a bit of a bummer. Basically what I think I'm looking at here is binned chips. More specifically, those jumpers supply power to the control circuits on the hashing chip on either die 0/1 or 2/3. Along with those four sets of jumper/resistors around the board that's how the Titan talks to the control aspects of dies 0,1,2,3.

With the resistor out those dies are off. Put them in and the die controller is powered. At that point those dies now talk on the chip bus, and can chatter/jam the bus if bad. So KNC never put the jumper in if the chip had bad dies on the top or bottom, they probably sold these as the "filler" to make out a set (so 3 90mh Titans plus one 40mh would still make a fair 300mh or whatever it was they sold this as).

Put the jumpers in, turn on the supplies, and the chip can run with all dies. Or it can go insane. Or it can run one die and not the other. Or it can happily run at 100mhz but jam the other die at 150. Strange things happen, and what I am *really* wondering is if this means that General Tarkin's code can fix this by doing his sweep the frequencies and reset a die if it goes bad (the "warm restart" thing). In which case he's going to be a God. We'll see.

Hey, we have to acknowledge failures as well as successes. It's the only way we learn. I don't charge for failures, so if things don't work there's either no charge or the bitcoin gets sent back.

Onward to the next thing. :-)

Titan  processor
OCTTNC-AMMS-009
TAG779.00
TAG77900-1

Neptune processor
OCTTNC-AMMS-008
NNX465.00
NMX46500-1

and neptune board is with big BTC sign the circle which is not an Titan board.

So I found a board laying around that looks like a titan board - but when I plug into controller it says BE under type on the controller.  Any ideas?

Also one of the flakey Titan cubes takes down the whole controller (not killed just down)  It did work before.  Just all of the sudden crashed.

This is how I keep a cool head when not doing Comm. Real estate. 

Thanks,

Boomin

Bad news cube ran file all evening but after letting it sit for 4 hours dies 1 and 2 throw errors. This is why you have to test your work several times.

And why we acknowledge failures as well as successes.

Crap as they say back to drawing board. And it was hashi g so nicely.....

I do not think so.

Missing resistor from second cube.


Click to enlarge

Welcome to Titan land!

It's probably a shorted FET on the high side of one of the power supplies or a blown apart capacitor shorting things. Figuring out which FET it is takes some time to do. Problem is a short through on these Titans usually takes out one of the dies. However clearing it gets the rest online.

C

I also have a titan that keeps popping the atx power supply.  Is that an easy fix?

thanks

boomin

So the dead dies thing is seriously the resistor MIA???  And if so what is the value of said resistor?  Or is it a simple jumper?

Thanks,

Boomin

Possibly. Send one first, let me see if this fix fixes that.

However if you have two dead dies and it's been that way for a long time let me know.

Or if your Titan blows power supplies when plugged in.

Never dull. I'm going to bed, will see if this thing is hashing in the morning. Keeping the speeds down, but even 250mhz is purring along at 65mh.

Should I send my three cubes on your way! 1 die each- low current, low power and low temp, 3 dies -hash at max frequency?

Well fuck me......................................

DC/DC   Voltage (V)   Current (A)   Power (W)   Temperature (°C)
0   0.7863   34.6875   27.275   62.200
1   0.7810   35.3750   27.628   65.100
2   0.7867   35.5625   27.977   66.000
3   0.7897   35.5000   28.034   61.900
4   0.7866   32.6875   25.712   56.200
5   0.7850   33.3750   26.199   57.900
6   0.7885   31.8438   25.109   55.900
7   0.7886   31.9688   25.211   56.900

KNC 0:       | 76.06/72.23/72.67Mh/s | A:12 R:0+0(none) HW:3/.64%
KNC 1:       | 84.17/80.06/80.37Mh/s | A:13 R:0+0(none) HW:3/.55%

Ladies and gentlemen,
Boys and girls...
Party time is here......

https://youtu.be/s8MDNFaGfT4

Missing resistor from 0.8V Idle cube.


Click to enlarge

Well those are worth something :-) If you dare take them apart and post a picture of each board at high resolution so we can try to compare what is what and where is where.

And never plug a suspect Titan into a working string of them without testing first :-)

Lightfoot -

I just got some Titans and a controller and I have them working - 2 of them working on all dies - and 2 spotty at best.  I am happy to help if you need anything tested or otherwise.  I also bought the custom firmware to play with.  So far so good!


Thanks,

Boomin

I'm wondering if these were binned from the factory. They promise 300mh per four cubes, 3 cubes with 4 dies, one with two. Or something like that. The missing jumpers is kind of odd, they go somewhere.

Meantime I'm back to square 1.5 with the blown titan board, I hooked up a second engine and the thing now shuts down the supply with pin 8 connected agian. Back to drawing board another day, I need to cook some food.

anyone else got jumper news?

I have 3 dies out of 3 cubes that show low current, low power and low temperature but voltage seems to be on par with working dies. No matter what settings I use they stay the same. Surprisingly, the other 3 dies of each cube hash at 325 MHz.

I've seen it twice where one of the two supplies dies and the unit is not shorted. The issue is the remaining supply tries to power the die and if more than 50% total hash is requested supply 2 will crowbar and shut down. So I try those at 1/2 speed first (well, 100mhz) then step up.

Replacing the power supply is possible, but to be honest such a pain it's not worth it if you can get 50% hashing.