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    Cisco/Linksys SD208 Failure

    5 years of service, the SD208 started to fail at random. Last night, it failed completely with all LEDs flashing a 1Hz. The SD208 was well fanned and UPS'ed. Open* case revealed a bulged cap C202 470micF 16V 105deg brand 'Stone'.

    *tip to open the case: pry the front/LED plastic bezel [three catches up and down] and the back/RJ45 plastic bezel [two caches on RHS and LHS side], then slide the top metal half-shell forward. See pictures 'case' and 'catch'.
    Attached Files
    Last edited by vince88; 08-05-2015, 04:19 PM. Reason: Tip for opening the case

    #2
    Re: Cisco/Linksys SD208 Failure

    Wow, that just goes to show how low quality Stone caps are. 5 years in a low power device with good cooling, and they're bad. That's horrible! Vantec is using these caps in all of their USB 3 3.5" external enclosures.

    Do you plan on fixing it?

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      #3
      Re: Cisco/Linksys SD208 Failure

      I did replace the two STONE 470micF/16VDC C129 on the input 12VDC and C202 on the 2.5VDC output of the step down converter AMC34063AM feeding the switch IC. The SD208 works, but I hesitate to put the SD208 back in a mission critical role as it was before. I will leave it powered on the bench for a few days with a full set of loop-back cables to validate the fix.
      With that full loop-back load, the small heat-sink on top of the switch IC [124 pins plastic gull wing SMT] runs at 50degC and the caps at 40degC for a convection-only bare PCB with an ambient 25degC. When the PCB is mounted inside the metal case, temperatures are 55degC and 45degC.

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        #4
        Re: Cisco/Linksys SD208 Failure

        If you do a full recap on it with Japanese caps, I would then have no hesitations about using it in a mission-critical role. In fact, I trust it even more than I would have before, as you know that the caps will never fail again.
        Last edited by c_hegge; 08-06-2015, 02:15 AM.
        I love putting bad caps and flat batteries in fire and watching them explode!!

        No wonder it doesn't work! You installed the jumper wires backwards

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