> 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 > > >
