Thanks for the suggestion John. I went back through the CASPER archive and found the problem you referred to. It concerned a different voltage rail and is unrelated.
I replaced the 2V5 regulator (U53, PTH08T230WAD) and the board is now working again. Cheers, Oliver On May 13, 2014, at 6:21 PM, John Ford wrote: >> Hi all, >> >> I have a ROACH board, rev 2, which fails to boot up. It starts, then turns >> off all the LEDs, then tries again, before giving up after several >> attempts. >> >> Using XPORT it reports that: >> Flash crashlog: Crash at 123695058649373s system time caused by channel 28 >> (2V5 PS (volts)) with value 2.36 >> >> This says that the 2V5 regulator, U53, is not producing the correct >> voltage. I should note that this board used to work fine, but recently >> stopped. >> >> Has anyone else had this problem before? I suppose that the appropriate >> solution is to replace U53 -- any guidance on whether this is the >> appropriate solution? > > We have fixed a few of these problems. I think it's the mosfet, not > necessarily the regulator. Jason Ray at NRAo can confrm or deny my memory > of the problem and solution! > > John > >> >> Thanks, >> Oliver >> >> >> ------ >> Oliver King >> Senior Scientist >> Astronomy Department, Caltech >> +1-626-395-4197 >> >> >> > > ------ Oliver King Senior Scientist Astronomy Department, Caltech +1-626-395-4197
