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APC BackUPS LS-500 Schematics?

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    #21
    Re: APC BackUPS LS-500 Schematics?

    Originally posted by CapLeaker View Post
    I know that this schematic I posted above isn't the exact match, but it should be good enough to give an idea what is going on.

    For me, I'd ESR the sh*t out of them caps and replace them. I've had a run in with my small SMT a few years back, it turned itself off all the time.
    https://www.badcaps.net/forum/showthread.php?t=66277

    I'd change the two brown caps, the 2 black caps next to it and C51 and retest.
    Got it, I will be replacing larger brown and black caps. I may do some more trouble shooting on the board first just to see if I can find other bad caps too.

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      #22
      Re: APC BackUPS LS-500 Schematics?

      if you see a regulator, change the caps surrounding it too.

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        #23
        Re: APC BackUPS LS-500 Schematics?

        Originally posted by CapLeaker View Post
        if you see a regulator, change the caps surrounding it too.
        I may need some help in identifying if the board has a regulator. Would that be one of the IC chips that I listed in an earlier post? Or is it something else on the board? I have pictures of the board in an earlier post.

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          #24
          Re: APC BackUPS LS-500 Schematics?

          I would definitely recommend doing the ones right next to these chip but ones you get working correctly I would highly recommend that you recap the hole board

          As far as the regulator ic chip you would have to look up each part to what kind a chip it is
          Last edited by sam_sam_sam; 07-05-2020, 05:47 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

          Comment


            #25
            Re: APC BackUPS LS-500 Schematics?

            I found a regulator. It is a LM2575T. I will be tracing down the caps that are next to it.

            It may be next week sometime before I have any results, but I will post what I find.

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              #26
              Re: APC BackUPS LS-500 Schematics?

              I finally replaced all ten of the various aluminum radial electrolytic capacitors on the board. The only ones that seemed out of spec. were the smallest ones - 22uF 16V ones, which were blue and made by JiangHai. There are 6 of these on the board. Some of them had very high ESR values. I have been running it for a few days now with the new caps and it is no longer beeping. So I am thinking that they were the cause of the intermittent beeping I experienced. Thank you to everyone who helped me with this fix.

              Comment


                #27
                Re: APC BackUPS LS-500 Schematics?

                good to hear that you had success!

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                  #28
                  Re: APC BackUPS LS-500 Schematics?

                  I am glad you got it back up and running

                  On this voltage regulator what was on the next line was it a 5 or was it 12 this tell you what what voltage is
                  Now if it not have anything then it adjustable type
                  Last edited by sam_sam_sam; 09-05-2020, 04:40 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

                  Comment


                    #29
                    Re: APC BackUPS LS-500 Schematics?

                    Sorry Sam_sam_sam,
                    I don't know what was printed on the next line on the regulator. It is all back together now, and I can't see that part. And it is not easy to get it apart.

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