Author

Topic: Antminer U2 Widerstände (Read 1915 times)

legendary
Activity: 1045
Merit: 1157
no degradation
March 30, 2015, 11:21:30 AM
#8
Nach der Formel Vo=0.8*(1+R1/R2) aus dem U1 User Guide wurden die U2 mit 0,9 Volt betrieben.

Mit R1=1k und R2=open läuft der nachgelötete U2 nun mit 0,8 Volt.

Die vielen HW-Fehler würde ich auf den Takt schieben. Wenn Du den U2 > 2 Ghash/s fährst, meine ich mich zu erinnern, dass die 0,8 Volt einfach zu wenig sind -> HW-Fehler. Bei 0,9 Volt laufen sie bis mindestens 2,3 Ghash/s stabil, manche bis 2,6 GHash/s.
member
Activity: 76
Merit: 10
March 06, 2015, 04:26:23 PM
#7
Habe nun bei R1 einen 1kOhm Widerstand eingesetzt und R2 offen gelassen.
Nun treten mächtig viele Hardware-Errors auf.



jemand eine Ahnung warum?
hero member
Activity: 686
Merit: 500
FUN > ROI
March 06, 2015, 12:27:01 PM
#6
I can't rule out that there were batches that were pre-overclocked, though I have yet to come across ones that weren't modified.  Usually you can tell by the solder or difference in resistor packages/markings compared to the other ones on the board.
( Or you can tell because they stuck an antminer u2 on a giant heat sink with hot glue )
If you can share a picture/information on where you got it, it might be easier to determine Smiley



That said.. the resistors should only handle some overclocking, and it should be mining - even if only for a little bit until things get too hot.  I'd check if it's detected okay first (cgminer/bfgminer/whatever), as it seems more likely to be a software/driver issue.  If it isn't, then hopefully that doesn't mean you've got dead miners.

You can continue asking in German, by the way - this is the German subforum after all - and I read German pretty well.  Writing, not so much Smiley
member
Activity: 76
Merit: 10
March 06, 2015, 12:11:41 PM
#5
okay, i soldering on the pace R1 a 1kOhm Resistor and because R1 Open. I hope then it run.
I understand why by my all U2 are R1=1,5 and R2=12 kOhm
Sorry for my bad English
hero member
Activity: 686
Merit: 500
FUN > ROI
March 06, 2015, 11:57:28 AM
#4
Out of the factory, R1 is unpopulated and R2 is 1kΩ.  If yours had 2 resistors populated, it was already modified by somebody before.

The AntMiner U1 and AntMiner U2 are effectively identical, except for:
  • Silkscreen: v1.1 vs 1.2
  • Thermal management: heatspreader vs heatsink
  • Decoupling: additional caps near the secondary vreg
All the chips and components are functionally the same, though may come from different manufacturers.  The crystal (25MHz), main voltage regulator (AOZ1021) and the hasher (BM1380) are the same (date code differences, of course).  The notes regarding overclocking a U1 applies to U2 as well.  The U2 is just better able to handle it due to the bigger heat sink.
member
Activity: 76
Merit: 10
March 06, 2015, 11:41:22 AM
#3
habe ich mal dazu durchgerungen und bei einem meiner U2 die Beiden Widerstände runterzulöten und zu messen. bei dem R2 komme ich auf 12kOhm
und bei dem R1 auf 1,5kOhm
kann jemand dazu was sagen? Nicht das die Widerstände schon von meinem Vorbesitzer gewechselt worden sind.
Sind die ICs, in einem Oben genannten Post identisch bei dem U1 und U2?
hero member
Activity: 686
Merit: 500
FUN > ROI
March 03, 2015, 06:11:27 PM
#2
Same as for the U1, see this overclocking guide or the datasheet for the AOZ1021 buck regulator for details: https://coinreport.net/overclock-antminer-u1-guide/
If you're talking about the one to the right of that (next to the 'ANT' silkscreen), the loop compensation resistor, that's 5.1kΩ
member
Activity: 76
Merit: 10
March 03, 2015, 04:15:37 PM
#1
Hallo, habe bei mir einen Antiner U2 liegen wo allerdings die Beiden Widerstände vor dem IC Z1021AI fehlen.
Kann evtl. jemand sagen welche Werte die Beiden haben?
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