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Corsair CX400 with bad OST RLX capacitors

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    Corsair CX400 with bad OST RLX capacitors

    A bit off-topic but I just wanted to share my experience with this power supply. I've owned it for almost 10 years now with moderate usage (daily, but no OC). Had to replace the fan and the OST RLX series caps (the blue ones), which failed on me twice (one cap was bloated, the other one was bad but didn't show visual signs).

    I read somewhere in the forum that these blue OSTs were crap, and I can confirm I had two failures. Of course I've been using them for a long time, but still...

    I replaced the first one with Nippon Chemicon KY series (the only good ones I could find, general purpose but still rather low-ESR), and the second one with a new RLS series I had around (I hope it won't fail at least in a couple of years). Probably not the best recap but it's been working well.

    This PS also sports additional OSTs RLSes in the outputs which I preemptively replaced with Rubycon MCZs.

    Moderator note: split this discussion off from the original thread here: https://www.badcaps.net/forum/showthread.php?t=49596
    Also note this thread might also be relevant: https://www.badcaps.net/forum/showthread.php?t=68294
    Last edited by Per Hansson; 07-15-2022, 06:07 PM. Reason: Thread split

    #2
    Re: Corsair CX400W 5vsb goes into safety loop

    Actually, NCC KY series are low impedance, high ripple current parts, probably a good choice. As for the Rubycon MCZ, that might be "too good", and it might not be great in a P/S. If I recall correctly, it's an ultra-low impedance part, and that could affect the stability of the control loop. Also, the water-based electrolytes in ultra-low impedance parts don't do well in hot environments, which the output sides of P/Ss tend to be (hot rectifiers, hot output inductors, and an output harness that impedes airflow).
    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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      #3
      Re: Corsair CX400W 5vsb goes into safety loop

      I have a feeling that those ostors are ultra-low ESR, Seasonics puts few of them in their OEM units for some reason.
      Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

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        #4
        Re: Corsair CX400W 5vsb goes into safety loop

        Originally posted by PeteS in CA View Post
        Actually, NCC KY series are low impedance, high ripple current parts, probably a good choice. As for the Rubycon MCZ, that might be "too good", and it might not be great in a P/S. If I recall correctly, it's an ultra-low impedance part, and that could affect the stability of the control loop. Also, the water-based electrolytes in ultra-low impedance parts don't do well in hot environments, which the output sides of P/Ss tend to be (hot rectifiers, hot output inductors, and an output harness that impedes airflow).
        Many thanks for the feedback, I was not aware of these potential issues w/ ultra-low ESR caps in SMPS, and it does make a lot of sense. These RLXs are indeed ultra-low ESRs.

        I'll look into removing the MCZs in the upcoming months then. I'll see if I can find KZEs or KZHs around, would those be better replacements? Thanks again.

        Comment


          #5
          Re: Corsair CX400W 5vsb goes into safety loop

          KZE are available but not in all UF values I will use KZE or KY or the automotive type of LXZ and LXY and had no issues using any of these series in switching power supply
          Last edited by sam_sam_sam; 11-29-2021, 07:18 PM.
          9 PC LCD Monitor
          6 LCD Flat Screen TV
          30 Desk Top Switching Power Supply
          10 Battery Charger Switching Power Supply for Power Tool
          6 18v Lithium Battery Power Boards for Tool Battery Packs
          1 XBox 360 Switching Power Supply and M Board
          25 Servo Drives 220/460 3 Phase
          6 De-soldering Station Switching Power Supply 1 Power Supply
          1 Dell Mother Board
          15 Computer Power Supply
          1 HP Printer Supply & Control Board * lighting finished it *


          These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

          1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
          2 Hem Saw Computer Stack Board

          All of these had CAPs POOF
          All of the mosfet that are taken out by bad caps

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            #6
            Re: Corsair CX400W 5vsb goes into safety loop

            yo ignoring me post for what reason?
            Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

            Exclusive caps, meters and more!
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              #7
              Re: Corsair CX400W 5vsb goes into safety loop

              Originally posted by Behemot View Post
              yo ignoring me post for what reason?
              In my previous post I replied I confirmed the RLXs were ultra-low esrs, I just didn't quote you as I replying to a previous message.

              Appreciate your and Sam's input on this. Thanks again.

              Comment


                #8
                Re: Corsair CX400W 5vsb goes into safety loop

                so why exactly yo want to replace anything when its working there in milions of units for over a decade now, FROM THE FAB? if those MCZs don't already have 12 years of use on them, I see no reason to replace anything
                Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

                Exclusive caps, meters and more!
                Hardware Insights - power supply reviews and more!

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                  #9
                  Re: Corsair CX400W 5vsb goes into safety loop

                  Originally posted by Behemot View Post
                  so why exactly yo want to replace anything when its working there in milions of units for over a decade now, FROM THE FAB? if those MCZs don't already have 12 years of use on them, I see no reason to replace anything
                  If you check my original post above, you'll see the original ones are not MCZs but stock OST RLSes w/ 10+ years which I replaced preemtively (w/ the MCZs) together with the two failed OST RLX caps (the blue ones).

                  What PeteS in CA conveyed makes a lot of sense (ultra low ESRs where we had low ESRs, water-based electrolytes), so that's why I mentioned I was considering replacing the MCZs again sometime in the future.

                  Tx.

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