Well, you never know. They have to power the hashing engines and the computer that collects the engines on each die and formats it for the FPGA. That takes more than .7 volts, so either they have a charge pump on the chip or they have something on this stupid board that does it.

I cheated. Using the driver code in bfgminer trip to diagnostic mode and save all the output to the disk. Question: Just include the driver code in your own routine and push/pull info from the die that way.

Now what are those SOT-6 chips?

Indeed. Totally rebuilt p2pool from scratch, It might be running, my stale rate is 50% after a few hours. Will give it a day.

Yeah I was thinking that. When I say I have seen burned titans this is what I mean...

*However* (and here is the magic however button) the chip itself doesn't have any of the +12v lines going to it. Therefore it should not be crowbarring the supply. It could be a blown FET on the power supplies, or a blown cap that's not showing up, but it's not just the chip.

The chip has the .7 volt supplies going to it, some SPI lines one for each quadrant and the jury is still out as to what else it does.

Sweet. Compiled up and firing up p2pool to see if it's stable. The older clients resulted in lots of downtime and very slow getblocktemplates (30 seconds, etc).

Edit: Drat, still getting "Warning: LOST CONTACT WITH BITCOIND for 2.6 minutes! Check that it isn't frozen or dead!" messages even with bitcoin-cli getinfo being fine and only 16 network connections.

It's tiny, getting a picture even with a 6x loupe on the camera is a job. These guys have a picture of one of the parts, but no description on what it is:

http://www.aliexpress.com/item/Transistor-IC-chip-SMD-6-pin-IC-THR-SOT23-6/32240467148.html



Looking at the grainy picture I have so far of the part it could be a 2 as the first letter.

Where can I download the source for the latest version of Bitcoind that might work? 0.11.2 is useless.

By the way if anyone has the brain-search power to figure out what a TSOT6 chip with Z17C or Z17R or THR is, I would appreciate. I'm thinking linear power regulator to run the hotel circuits on the chip, but without specs I can't figure out what is a signal input and what is an output to the chip's cores.

Note: This is not what I am looking for here....

You need full pre-heat in order to heat that part of the board up enough to have a chance of getting it off without pulling up the VIAs. Mask the chip with aluminum foil under the board and give it everything you can, 375 degrees if possible. Then heat at 450c to get it off.

These dingbats have a picture of it, but no description.

http://www.aliexpress.com/item/Transistor-IC-chip-SMD-6-pin-IC-THR-SOT23-6/32240467148.html

Bedtime.

Edit: Damn, I am wrong. They are not ADP20's as I thought. But they are something. Let's describe what they are here.

First, they have power input from pins 4 and 6 of the SPI board. Interesting. Power comes in on pin 5, I know this because they put a stupid cap to ground and they always seem to do that. Likewise Pin 2 seems to be ground.

Pin 1 and 3 are unusual, they tend to go to pin 1 of the 10pin on u18, pin 9 on U17, etc.

Pin 4 and 6 go somewhere except on U19, where pin 4 goes to pin 3 on the 10 pin and 6 goes to gnd maybe.

The chips are 6 pin TSOT, the labeling is Z17R on Titans, Z17c on Neptunes except for one which is labelled THR.

So what are they? Jury is out, but something has to be powering the hotel on the chips.

More damn, trying to search on those parts is giving me crap like this:



Ok, fine, cute,but not what I need right now.

I really wish someone at KNC would just drop me a damn hijavascript:void(0);nt....

Do not buy miners.

Why?

Because it is a "Queen's Race". Look it up. Because since bitcoin is a 100% fungible commodity it suffers from what is called "perfect competition". Look it up. Because since people already are losing and are mining to minimize losses this is a "dollar auction".

Buy an old miner for a few bucks to play, but do not think you will make profits.

Don't.

That is a woman who can handle a very large cock.

Um. What speed were you hashing at? And um... How did you put the heat sink back on?

And um.... can you take a picture of the board? I run a repair service for sad Titans, but I'm wondering what happened to this one.

Bingo! Thanks for that, with screen up and running I don't have to lobotomize bfgminer (though it's nice to do if you want logs).

Talking to SPI directly and playing with WAAS tells me all sorts of things. Like the fact that on this Titan with two working engines and two non-working (voltage shows up, small current draws)

Die 0 is insane. Powers up, can query, but can't set the nonces. Mumbles sometimes on the SPI, corrupting results from engine 2.

Die 1 is dead as a doornail. 4 amps of nothing.

Die 2 and 3 are great. Leaving die 0 off gives a solid 40mh.

With die 0 on, 1,2,3 off:

 [2016-02-12 22:36:00] KnC 1-0: Found TITAN die with 571 cores
 [2016-02-12 22:36:00] KnC 1-1: No KnC chip found
 [2016-02-12 22:36:00] KnC 1-2: No KnC chip found
 [2016-02-12 22:36:00] KnC 1-3: No KnC chip found

...

[2016-02-12 22:36:06] KnC 1-0: Failed to set nonce range (wanted 0x01, get 0x00
)
 [2016-02-12 22:36:06] KnC 1-0: Failed to set nonce range (wanted 0x01, get 0x00
)
 [2016-02-12 22:36:06] KnC 1-0: Failed to set nonce range (wanted 0x02, get 0x00)
 [2016-02-12 22:36:06] KnC 1-0: Failed to set nonce range (wanted 0x02, get 0x00)
 [2016-02-12 22:36:06] KnC 1-0: Failed to set nonce range (wanted 0x03, get 0x00)
 [2016-02-12 22:36:06] KnC 1-0: Failed to set nonce range (wanted 0x03, get 0x00)
 [2016-02-12 22:36:06] KnC 1-0: Failed to set nonce range (wanted 0x04, get 0x00)
 [2016-02-12 22:36:06] KnC 1-0: Failed to set nonce range (wanted 0x04, get 0x00)
 [2016-02-12 22:36:06] KnC 1-0: Failed to set nonce range (wanted 0x04, get 0x00)
 [2016-02-12 22:36:06] KnC 1-0: Failed to set nonce range (wanted 0x05, get 0x00)

...

[2016-02-12 22:36:13] KnC spi:
 [2016-02-12 22:36:13] 00000000   82 59 81 00 ff ff f2 04  00 00 00 5e f2 33 e3 a6 |.Y.........^.3..|
 [2016-02-12 22:36:13] 00000010   3e 2d 18 36 1c b2 4d 90  06 9d 90 51 d8 85 92 0e |>-.6..M....Q....|
 [2016-02-12 22:36:13] 00000020   e5 43 cd ec dc c6 53 86  6f e2 7c e3 b1 a9 7a 6b |.C....S.o.|...zk|
 [2016-02-12 22:36:13] 00000030   a6 a1 44 5c 17 f2 bb 9c  50 e6 22 45 6f 1d 48 b1 |..D\....P."Eo.H.|
 [2016-02-12 22:36:13] 00000040   16 ca e7 25 ea 4b 14 cf  82 4e 99 48 5e be 56 3e |...%.K...N.H^.V>|
 [2016-02-12 22:36:13] 00000050   38 01 1b 6f b2 86 cd 00  00 00 00                |8..o.......     |
 [2016-02-12 22:36:13] 00000000   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
 [2016-02-12 22:36:13] 00000010   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
 [2016-02-12 22:36:13] 00000020   00 1a 7a 52 b3 00 00 00  00 00 00 00 00 00 00 00 |..zR............|
 [2016-02-12 22:36:13] 00000030   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
 [2016-02-12 22:36:13] 00000040   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
 [2016-02-12 22:36:13] 00000050   00 00 00 00 00 00 00 81  00 ff ff                |...........     |
 [2016-02-12 22:36:13] KNC 0[1:0:65535]: Core busy (0)

Basically flipflops between that and:

 [2016-02-12 22:36:13] KnC spi:
 [2016-02-12 22:36:13] 00000000   82 a7 80 00 00 00 cc 1d  69 27 00 00 00 00 00 00 |........i'......|
 [2016-02-12 22:36:13] 00000010   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
 [2016-02-12 22:36:13] 00000020   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
 [2016-02-12 22:36:13] 00000030   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
 [2016-02-12 22:36:13] 00000040   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
 [2016-02-12 22:36:13] 00000050   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
 [2016-02-12 22:36:13] 00000060   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
 [2016-02-12 22:36:13] 00000070   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
 [2016-02-12 22:36:13] 00000080   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
 [2016-02-12 22:36:13] 00000090   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
 [2016-02-12 22:36:13] 000000a0   00 00 00 00 00 00 00 00  00                      |.........       |

Yep, it's stupid. Interesting.

Problem is that if the price goes up more miners pile in and difficulty skyrockets. Besides, why not just buy the bitcoin anyway and sell when it goes up.

Mining is a queen's race. And it's not possible to make long term economic profit in a game like mining. Too perfect competition.

Having Die 1 showing no voltage might actually be easier of a repair than the ones that show voltage but no hashing. Your issue is most likely shorted low-side FETs holding the power supply for that core to ground. Let me know if you want to send one in for a review.

C

There is one odd thing: The heat sink compound on a 2 die down titan that came in was very odd. It looked almost as if it had been slathered on one side of the chip more than the other. This would cause pressure on the chip top and I have seen other types of miners where asymmetrical pressure cracks a chip and causes all sorts of weird stuff to happen.

I still need to check the tiny chips on the board, I think they interface between the SPI bus and the hashing chip but I will say that fixing a Titan that shorts out the power supply is do-able, fixing a dead die on a Titan is not very possible, and fixing a Titan board that blows out the SPI interface is a nightmare bitch on wheels.

Question: From the command line is it possible to screen over to see the cgminer process running? I'd like to find out the error rates.

I am starting to come to the conclusion that dead dies on Titans might be related to the heat sink compound being splatted on the chip a bit oddly. So far it's not related to the power supplies, main caps, filtering caps, or the fpga's. It still *MIGHT* be related to the very small chips that sit between the 10 pin connections and the hashing chip, but I do not think so.

Anyone know what the very small chips on the board are?

Ok. Hooked up pin 8 though, that doesn't shut down the controller anymore. Good.

However unit still doesn't hash. Voltages are up, temps are stable, but nothing when I fire up for hashing. Either the short on pin 4,6 is still a problem, or something else is up. Will try hooking up the second die to see if I can get the one that was 800k resistance to ground working, maybe that one will have something.