Rekumkacz (OP)
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July 15, 2016, 11:19:21 AM |
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Hi
I have several damaged Boards from S7 after the warranty period.
I thought about building a tester for testing individual chips, voltage, protocol, UART, etc.
I read the documentation but not too much I learned
I measured the voltage that generates a DC-DC converter and is about 8V to the chain chips
Where to start?
It is now available schema for the board?
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Unacceptable
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July 15, 2016, 11:14:28 PM |
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About the only person who could shed any light on this for you is sidehack. Maybe he'll show up & share some info on whether what your asking is something you could do or not  |
"If you run into an asshole in the morning, you ran into an asshole. If you run into assholes all day long, you are the asshole." -Raylan Givens Got GOXXED ?? https://www.youtube.com/watch?v=9KiqRpPiJAU&feature=youtu.be"An ASIC being late is perfectly normal, predictable, and legal..."Hashfast & BFL slogan  |
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sidehack
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July 16, 2016, 05:43:02 AM |
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I did work up a test Compac with BM1385 but could never get it to work. The friggin' 0.4mm pitch ASICs are a bear to work with, plus that they're impossible to reliably acquire thanks to the chipside heatsinks, got the whole project scrapped in prototype.
I haven't looked over an S7 board specifically for chip stuff in a while (been focused more on power) but I believe there are test pads between chips if you can get to them around the heatsinks. You could at least verify where signals are going.
If the DC-DC is at about 8V, there's something wrong. It should start out around 9.3V and if you provide 3.3V to the 3.3V pin on the 18-pin header (or just plug the cable into a powered controller board) you should see that jump to 10.2V or so unless there's something very wrong with the PIC/DPOT parts of the power circuit. There's already a couple threads on that subject though.
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Rekumkacz (OP)
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July 16, 2016, 11:33:30 AM |
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I made some steps and measured the voltage on the individual chips . https://i.imgur.com/WZjjpi9.jpgAfter connecting 3.3v voltage jumped from 8.32V to 10.56V . It comes out that three chips are connected in series, then fifteen groups are connected in parallel |
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sidehack
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July 16, 2016, 02:18:14 PM |
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That's about exactly what you should be seeing, so it means the power circuit is functional. Next thing would be to poke reset, TX, RX and clock lines at the 18-pin and see if those signals make it all the way to the last chip in the chain. This should be done while the board is powered up, of course.
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Rekumkacz (OP)
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July 16, 2016, 02:47:07 PM |
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I understand now that I connect the USB to UART and see what appears on the terminal ?
The control board detect the only one chip.
which chip is first and which is last in the chain?
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sidehack
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July 16, 2016, 03:08:18 PM |
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Where'd a USB to UART enter the picture?
Signals in Antminers go uphill, so the first chip would be on the lowest-volt node and the last is at the highest. I'm not sure offhand where those are but it shouldn't be too hard to tell.
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Rekumkacz (OP)
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July 16, 2016, 04:19:23 PM |
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I have a FT232 USB to uart converter and i will use to connect to the 18 pin header
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