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Dell NPS-730AB A - Intermittent shut-down?

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    #1

    Dell NPS-730AB A - Intermittent shut-down?

    Have this supply out of a Dell rack that will run for a while, maybe an hour, then fail. Techies at my company is a network guy and has no idea how to sling solder so I said I'd look at it for him. He already replaced the supply and the system is normal, again but he'd like to fix this psu.

    I don't see any vented or bulging caps, but they are all crappy L-tec and Taicons save for the UCC mains. Any ideas?
    Presonus Audiobox USB, Schiit Magni 3, Sony MDR-V700
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    #2
    Re: Dell NPS-730AB A - Intermittent shut-down?

    the caps could be bad without looking bad.
    also post pictures if you can.
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      #3
      Re: Dell NPS-730AB A - Intermittent shut-down?

      Originally posted by Phaihn View Post
      the caps could be bad without looking bad.
      also post pictures if you can.
      Especially the Ltec. Taicon actually aren't as bad as they may seem, they can last quite a while and handle heat decently. Much better than Teapo can. I still replace them if I can though...You could recap it and see if that fixes it but my gut is telling me this isn't a cap issue

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        #4
        Re: Dell NPS-730AB A - Intermittent shut-down?

        My gut tells me you're likely correct. Though there are some missing and undersized caps, some right up next to regulators... tough to spend $10-$20 just to try.
        Presonus Audiobox USB, Schiit Magni 3, Sony MDR-V700

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          #5
          Re: Dell NPS-730AB A - Intermittent shut-down?

          An hour ... could a fan be not working and the thing heats up into thermal shutdown?

          If it has either a UC384x PWM or one of those PFC-PWM combo custom ICs, check to see if it has a low value GP lytic cap for start-up. Those can go bad without venting.

          Maybe a similar kind of thing with the O/P cap of the +5V Stby?

          Delta's office is in Fremont, just off I-880 (Fremont Blvd exit, on Cushing Pkwy). They do have tech support people there, though not sure they could help.
          PeteS in CA

          Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
          ****************************
          To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
          ****************************

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            #6
            Re: Dell NPS-730AB A - Intermittent shut-down?

            ... some missing and undersized caps ...
            The PCB may be laid out and used for more than one model and those other models might use the "missing" or larger parts.
            PeteS in CA

            Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
            ****************************
            To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
            ****************************

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