One of our N200 seems to have died suddenly. It was working fine and then the UHD program we were running complained about being unable to send control packets, we did not get any more samples, and our program exited. We tried to power cycle the N200 by removing the power adapter and plugging it back in, but it did not turn on properly. None of the 6 LEDs lights. The orange LED in the Ethernet connector lights when a cable is plugged it, but that's it. The fan runs. We tried to power cycle it a few more times but always got the same result. We tried to plug in power while S2 is pressed, but the LEDs are still all off. The unit was not in the middle of any kind of firmware/image update, just running normally against a UHD program. Any advice on what to do next would be appreciated. Thanks, Sivan

Measuring the voltages at the outputs of the regulators showed that the 3.3V regulation is broken. The voltage at J104 is only 1V, not 3.3V. The 1.2V and 2.5V outputs seem fine. On Wed, Apr 17, 2013 at 12:25 PM, Sivan Toledo <stoledo@tau.ac.il> wrote: > One of our N200 seems to have died suddenly. It was working fine and then > the UHD program we were running complained about being unable to send > control packets, we did not get any more samples, and our program exited. > > We tried to power cycle the N200 by removing the power adapter and > plugging it back in, but it did not turn on properly. None of the 6 LEDs > lights. The orange LED in the Ethernet connector lights when a cable is > plugged it, but that's it. The fan runs. > > We tried to power cycle it a few more times but always got the same > result. We tried to plug in power while S2 is pressed, but the LEDs are > still all off. > > The unit was not in the middle of any kind of firmware/image update, just > running normally against a UHD program. > > Any advice on what to do next would be appreciated. > > Thanks, Sivan > > > > > >

Have you tried another power supply with the usrp? We just had one usrp n210 die on us. We traced it down to a failing power supply (the usrp was a few years old). It couldn't supply the needed 3 amps any more. When we opened up the supply, we found an expanded capacitor. juha On Wed, Apr 17, 2013 at 10:36 AM, Sivan Toledo <stoledo@tau.ac.il> wrote: > Measuring the voltages at the outputs of the regulators showed that the > 3.3V regulation is broken. The voltage at J104 is only 1V, not 3.3V. The > 1.2V and 2.5V outputs seem fine. > > > On Wed, Apr 17, 2013 at 12:25 PM, Sivan Toledo <stoledo@tau.ac.il> wrote: > >> One of our N200 seems to have died suddenly. It was working fine and then >> the UHD program we were running complained about being unable to send >> control packets, we did not get any more samples, and our program exited. >> >> We tried to power cycle the N200 by removing the power adapter and >> plugging it back in, but it did not turn on properly. None of the 6 LEDs >> lights. The orange LED in the Ethernet connector lights when a cable is >> plugged it, but that's it. The fan runs. >> >> We tried to power cycle it a few more times but always got the same >> result. We tried to plug in power while S2 is pressed, but the LEDs are >> still all off. >> >> The unit was not in the middle of any kind of firmware/image update, just >> running normally against a UHD program. >> >> Any advice on what to do next would be appreciated. >> >> Thanks, Sivan >> >> >> >> >> >> > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >

No, it's not the external power supply. I have another N200 and both power supply work fine with the other N200, but the dead unit does not work with any of them. On Wed, Apr 17, 2013 at 2:12 PM, Juha Vierinen <x@mit.edu> wrote: > Have you tried another power supply with the usrp? > > We just had one usrp n210 die on us. We traced it down to a failing power > supply (the usrp was a few years old). It couldn't supply the needed 3 amps > any more. When we opened up the supply, we found an expanded capacitor. > > juha > > > On Wed, Apr 17, 2013 at 10:36 AM, Sivan Toledo <stoledo@tau.ac.il> wrote: > >> Measuring the voltages at the outputs of the regulators showed that the >> 3.3V regulation is broken. The voltage at J104 is only 1V, not 3.3V. The >> 1.2V and 2.5V outputs seem fine. >> >> >> On Wed, Apr 17, 2013 at 12:25 PM, Sivan Toledo <stoledo@tau.ac.il> wrote: >> >>> One of our N200 seems to have died suddenly. It was working fine and >>> then the UHD program we were running complained about being unable to send >>> control packets, we did not get any more samples, and our program exited. >>> >>> We tried to power cycle the N200 by removing the power adapter and >>> plugging it back in, but it did not turn on properly. None of the 6 LEDs >>> lights. The orange LED in the Ethernet connector lights when a cable is >>> plugged it, but that's it. The fan runs. >>> >>> We tried to power cycle it a few more times but always got the same >>> result. We tried to plug in power while S2 is pressed, but the LEDs are >>> still all off. >>> >>> The unit was not in the middle of any kind of firmware/image update, >>> just running normally against a UHD program. >>> >>> Any advice on what to do next would be appreciated. >>> >>> Thanks, Sivan >>> >>> >>> >>> >>> >>> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> >

 One of our N200 seems to have died suddenly. It was working fine
 and then the UHD program we were running complained about being
 unable to send control packets, we did not get any more samples,
 and our program exited.

 We tried to power cycle the N200 by removing the power adapter and
 plugging it back in, but it did not turn on properly. None of the
 6 LEDs lights. The orange LED in the Ethernet connector lights
 when a cable is plugged it, but that's it. The fan runs.

 We tried to power cycle it a few more times but always got the
 same result. We tried to plug in power while S2 is pressed, but
 the LEDs are still all off.

 The unit was not in the middle of any kind of firmware/image
 update, just running normally against a UHD program.

 Any advice on what to do next would be appreciated.

 Thanks, Sivan

One thing that might be worth checking is whether any parts of the board seem to be abnormally hot. If the 3.3 V regulator is only putting out 1 V, that may be because some device on that net is trying to sink more current than the regulator can provide. The internal resistance of the regulator would then cause the voltage to droop. This would typically only happen if one of the devices on the board has died short. It may not help you fix the problem, but it might get you some more information. Jason On 04/17/2013 06:36 AM, Sivan Toledo wrote: > Measuring the voltages at the outputs of the regulators showed that > the 3.3V regulation is broken. The voltage at J104 is only 1V, not > 3.3V. The 1.2V and 2.5V outputs seem fine. > > > On Wed, Apr 17, 2013 at 12:25 PM, Sivan Toledo <stoledo@tau.ac.il > <mailto:stoledo@tau.ac.il>> wrote: > > One of our N200 seems to have died suddenly. It was working fine > and then the UHD program we were running complained about being > unable to send control packets, we did not get any more samples, > and our program exited. > > We tried to power cycle the N200 by removing the power adapter and > plugging it back in, but it did not turn on properly. None of the > 6 LEDs lights. The orange LED in the Ethernet connector lights > when a cable is plugged it, but that's it. The fan runs. > > We tried to power cycle it a few more times but always got the > same result. We tried to plug in power while S2 is pressed, but > the LEDs are still all off. > > The unit was not in the middle of any kind of firmware/image > update, just running normally against a UHD program. > > Any advice on what to do next would be appreciated. > > Thanks, Sivan > > > > > > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com