Need help identifying these caps!

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • theOracle
    Senior Member
    • Nov 2012
    • 163
    • USA

    #1

    Need help identifying these caps!

    what amount of capacitance are these and what brand and what type?
    and are they a type that has been known to fail?

    they are about ~12 years old.

    I am assuming the 4 in the top pic are 100 uF and 35V
    and the one on bottom appears to be 47 uF and 50V

    so I guess my main question is what brand and type are these and are they low ESR and especially, are they known to fail much? - I do not see any visual signs of failure, but I am suspecting them.



    Last edited by theOracle; 02-11-2015, 11:49 PM.
    __________________


    the BIG 4

    ~~~ the top tier of low-ESR electrolytic capacitors ~~~

  • Wester547
    -
    • Nov 2011
    • 1268
    • USA.

    #2
    Re: Need help identifying these caps!

    Those are most likely Nichicon UX.

    Datasheet.

    They are general purpose SMD electrolytic capacitors from Nichicon rated for 2,000 hours at 105*C (excepting the 160V ones and higher which are rated for 3,000 hours) in terms of load life and 1,000 hours at 105*C on the shelf. The datasheet seems to specify the same "2P" markings present on those capacitors in the image. Couldn't know if they are the issue without measuring them. However, I believe Nichicon WX (2,000 hours @ 85*C 5.5mm tall GP SMD lytics from Nichicon) have been known to leak from the bottom with old age, but I haven't seen any leak on Intel motherboards within the last 10-13 years, probably because they're not in stressful locations. The "A3" and "B4" markings on the SMD capacitors in your images likely mean that they were produced during the 3rd week of January, 2003 and the 4th week of February, 2003, in accordance to Table 12 of JIS C 5101.

    Comment

    • theOracle
      Senior Member
      • Nov 2012
      • 163
      • USA

      #3
      Re: Need help identifying these caps!

      I have a stock of very high quality low-ESR, 105C, through-hole caps from the manufacturers at the bottom of my signature and considering replacing these with them!

      by the way, your date decoding jives!

      everything else on this board is super high reliability, that is why I suspect the caps
      "it's always the caps" as the saying goes (lot of truth in that saying)
      __________________


      the BIG 4

      ~~~ the top tier of low-ESR electrolytic capacitors ~~~

      Comment

      • theOracle
        Senior Member
        • Nov 2012
        • 163
        • USA

        #4
        Re: Need help identifying these caps!

        Here is what I am unclear on, I can see now that these are definitely Nichicon, and I see the high temperature marking, but how do you know they are the UX series, it seems like there are about 20 different Nichicon chip-type SMD electrolytic series - how do you identify the series? - like why couldn't these be UD series, for example?
        __________________


        the BIG 4

        ~~~ the top tier of low-ESR electrolytic capacitors ~~~

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 30965
          • Albion

          #5
          Re: Need help identifying these caps!

          i dont tink it's Nichicon, that leaning over "o" symbol looks familiar.
          it may be korean - pos samsung.

          Comment

          • Wester547
            -
            • Nov 2011
            • 1268
            • USA.

            #6
            Re: Need help identifying these caps!

            That "O" symbol is on Nichicon SMD lytics, affirmed in the datasheet.
            Originally posted by theOracle
            Here is what I am unclear on, I can see now that these are definitely Nichicon, and I see the high temperature marking, but how do you know they are the UX series, it seems like there are about 20 different Nichicon chip-type SMD electrolytic series - how do you identify the series? - like why couldn't these be UD series, for example?
            Because Nichicon UD capacitors have "UD" marked on them.

            UD datasheet. Those are most likely UX judging by the voltage ratings on those capacitors. They could be WF but WF doesn't go up to 50V.

            Comment

            • theOracle
              Senior Member
              • Nov 2012
              • 163
              • USA

              #7
              Re: Need help identifying these caps!

              Originally posted by stj
              i dont tink it's Nichicon, that leaning over "o" symbol looks familiar.
              it may be korean - pos samsung.
              leaning over "o" symbol is definitely Nichicon, look at the datasheet linked to in post#2
              Last edited by theOracle; 02-12-2015, 12:16 AM.
              __________________


              the BIG 4

              ~~~ the top tier of low-ESR electrolytic capacitors ~~~

              Comment

              Related Topics

              Collapse

              • Paxman_Swede
                Identifying caps on an old Zoom 9000
                by Paxman_Swede
                Hello!

                I have two projects on my work bench. One is a friends dead JBL Xtreme speaker with a blown voltage regulator and corresponding bulged and shorted cap. That cap has clear markings so I know what replacement I need for it.

                The other project however is a whole different deal. It's a Zoom 9000 guitar effect from the 90th that has developed a devil hound howl when there is no input from the guitar. I'm guessing caps problem. So, since I don't really use this effect anymore I thought it would be a perfect project to learn on.

                I have studied the board and...
                01-14-2025, 09:51 AM
              • momaka
                Seasonic B12 BC-550 – barely 2 years old and with BAD CAPS already!
                by momaka
                I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.

                For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).

                https://www.badcaps.net/filedata/fetch?id=3591771


                https://www.badcaps.net/filedata/fetch?id=3591772

                It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:

                https://www.badcaps.net/filedata/fetch?id=359177...
                03-12-2025, 03:42 PM
              • crosswinds
                Assistance with identifying replacement caps on ASUS P5VDZ-MX
                by crosswinds
                Hello,

                So, pulled a motherboard out from storage, was working when put away, wont post when I took it out of storage today.
                Since it was working, and it looks to be essentially time that killed it I figured its a good idea to replace the caps before digging further.
                Looks to be only good quality caps on this board, so might not be the issue. But it is closing in on 20 years now so, wont hurt i guess

                Its a ASUS P5VDZ-MX board.

                I would really appreciate some assistance on what the best replacement caps would be for these:

                Panasonic(M)...
                04-17-2024, 04:25 PM
              • eryjus
                Heathkit IO-4205 Power Supply Caps
                by eryjus
                Hello,

                First, I am a complete noob with high voltage stuff. I'm learning, but I need help by someone looking over my shoulder.

                I recently came into posession of a Heathkit IO-4205 5MHz Dual Trace Oscilloscope. The documentation is copyright 1978. I'm told it works.

                I opened it up to check the caps before I applied power, and found the following black caps and wanted to know what they were. They are on the power supply board. I was able to read the name and model and came up with, "Nytronics 162J-1, 0.1uF, 20% tolerance, 2000VDC."
                ...
                05-10-2023, 11:21 AM
              • fl0w
                GeForce 6800GT recap, need help identifying caps and finding replacements
                by fl0w
                Hi,

                I just noticed that my Asus V9999GT (GeForce 6800 GT) had some swelling capacitors. I managed to identify the brown ones, which are Nippon Chemi-Con KZG series, 6.3V 820µF, which I plan to replace with this.
                But for the yellow ones, I guess these are Fujitsu caps, without being able to identify which series... A picture of the video card is attached to the topic.

                I need to replace:
                • 2x 2.5V 1500µF => I plan to use this
                • 2x 16V 330µF=> I plan to use this
                • 1x 6.3V 680µF=> I plan to use this
                Am I correct with the cap choices?

                Thanks for...
                10-02-2024, 11:28 AM
              • Loading...
              • No more items.
              Working...