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    APC BackUPS LS-500 Schematics?

    Asking for schematic and/or boardview for APC BackUPS LS-500.
    Board number: 640-0236J-13

    #2
    Re: APC BackUPS LS-500 Schematics?

    Can you please post some pictures of the board front and back so can read part numbers
    We might be able help you fix it
    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


      #3
      Re: APC BackUPS LS-500 Schematics?

      The pictures are below. I tried to get the best resolution I could.

      From left to right..
      #1. Top Left of the board
      #2. Top Right
      #3. Bottom side of #1
      #4. Bottom side of #2
      Attached Files

      Comment


        #4
        Re: APC BackUPS LS-500 Schematics?

        Here is the problem I am working on with this UPS. Sometimes, only for a second or 2, the 'bad battery' light flash and it will beep. I have tried different batteries, and it still does it. I have tried a brand new battery, and it still does it. It may show the fault once every 5 minutes, sometimes more frequently, sometimes less frequently. It does this when something is plugged into it, and when nothing is plugged into it. When the UPS is running I am getting a good voltage at the battery, 13.69 volts. When the new battery is unplugged from the UPS, it reads 13.7 volts. The new battery has charged for 24 hours.
        Thanks

        Comment


          #5
          Re: APC BackUPS LS-500 Schematics?

          Will this battery backup work with a 100 watt incandescent light bulb load with no 110 line voltage hooked up

          It should turn if you hold power on button for about 5 second or so ———> if not try this hook it up 110 volt line voltage then after it does it self check if has one then unplug it from the wall dose the light bulb stay light if not then you have a problem with the power switch over circuit
          Last edited by sam_sam_sam; 07-01-2020, 04:02 AM.
          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


            #6
            Re: APC BackUPS LS-500 Schematics?

            Yes, it works fine with a 100W light bulb running on the battery. I could see the light pulse just slightly, but it ran the bulb just fine. I ran it a few minutes.
            Last edited by cook; 07-02-2020, 07:06 AM. Reason: Typo

            Comment


              #7
              Re: APC BackUPS LS-500 Schematics?

              Okay

              While you had the 100 watt bulb running on battery power did the low battery warning flash on or did even come on while you were doing this test

              Look at the fault light wiring and trace where it goes on the circuit board until you reach a ic chip or some type of device and look up the device to see what it does then see if there is a capacitor near that device that goes to that device and replace them if there is more one capacitor

              also trace the battery terminals back to some type of voltage monitor circuit on this board and if you find any capacitor replace them as well but before you buy anything mark where these capacitor are on the board
              Last edited by sam_sam_sam; 07-02-2020, 03:56 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


                #8
                Re: APC BackUPS LS-500 Schematics?

                How many Watts is your actual load that you were having problem with? Notes: I am not talking about the 100W bulb.
                You can also add another 100W load to see what happen.
                Never stop learning
                Basic LCD TV and Monitor troubleshooting guides.
                http://www.badcaps.net/forum/showthr...956#post305956

                Voltage Regulator (LDO) testing:
                http://www.badcaps.net/forum/showthr...999#post300999

                Inverter testing using old CFL:
                http://www.badcaps.net/forum/showthr...er+testing+cfl

                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                http://s807.photobucket.com/user/budm/library/

                TV Factory reset codes listing:
                http://www.badcaps.net/forum/showthread.php?t=24809

                Comment


                  #9
                  Re: APC BackUPS LS-500 Schematics?

                  Originally posted by sam_sam_sam View Post
                  Okay

                  While you had the 100 watt bulb running on battery power did the low battery warning flash on or did even come on while you were doing this test

                  Look at the fault light wiring and trace where it goes on the circuit board until you reach a ic chip or some type of device and look up the device to see what it does then see if there is a capacitor near that device that goes to that device and replace them if there is more one capacitor

                  also trace the battery terminals back to some type of voltage monitor circuit on this board and if you find any capacitor replace them as well but before you buy anything mark where these capacitor are on the board
                  The 'replace battery' light did not come on during the test.

                  I will get a list of the ICs on the board and post them in order to help me figure out what chip might be responsible for the 'Battery Replace' alarm. I will get that together later today. Knowing which chip might be responsible for that will give me 2 ways to track down the capacitors on the circuit -- tracing back from the LED and tracing from the IC.

                  Comment


                    #10
                    Re: APC BackUPS LS-500 Schematics?

                    Originally posted by budm View Post
                    How many Watts is your actual load that you were having problem with? Notes: I am not talking about the 100W bulb.
                    You can also add another 100W load to see what happen.
                    The 'Replace Battery' alarm comes on with a load, and without any load.

                    I will find a more items to plug into it and run it to see if anything changes. I will run it plugged in to AC, and running on the battery.

                    Comment


                      #11
                      Re: APC BackUPS LS-500 Schematics?

                      Chips On The Board
                      APC BackUPS LS-500 / Model BP500UC / Board number: 640-0236J-13

                      Below are the ICs on the board. I looked up each one and I listed what I found about them.

                      Which ones might be part of the circuit that triggers the 'Replace Battery' alert? I am thinking it is one or both of the 'LMxxx' chips maybe?

                      ---------
                      BIG CHIP
                      The largest chip has a white APC sticker
                      on top of it listing it is for a 350/500/700
                      unit, along with a version number. So I am not
                      sure what that is. Maybe ROM?
                      ---------
                      360-2040B
                      UEWJ0414
                      What is this?
                      ---------
                      93LC46B
                      EEPROM
                      ---------
                      SN74HC595N
                      8-bit, serial in, parallel out shift register
                      Is this for the USB connection?
                      ---------
                      LM393N
                      Two independent voltage comparators
                      ---------
                      LM324AN
                      Four independent operational amplifiers (op amp)
                      ---------
                      4N25
                      Single channel phototransistor coupler
                      ---------

                      Comment


                        #12
                        Re: APC BackUPS LS-500 Schematics?

                        Originally posted by cook View Post
                        Chips On The Board
                        APC BackUPS LS-500 / Model BP500UC / Board number: 640-0236J-13

                        Below are the ICs on the board. I looked up each one and I listed what I found about them.

                        Which ones might be part of the circuit that triggers the 'Replace Battery' alert? I am thinking it is one or both of the 'LMxxx' chips maybe?

                        ---------
                        BIG CHIP
                        The largest chip has a white APC sticker
                        on top of it listing it is for a 350/500/700
                        unit, along with a version number. So I am not
                        sure what that is. Maybe ROM? ( if any pin goes any devices below that I made comments about then replace all capacitors that connects to any pin on this device )
                        ---------
                        360-2040B
                        UEWJ0414
                        What is this? ( does any pin of this chip go to any of following devices below if they do then replace all around this chip
                        ---------
                        93LC46B
                        EEPROM. ————
                        ---------
                        SN74HC595N
                        8-bit, serial in, parallel out shift register
                        Is this for the USB connection?
                        ---------
                        LM393N
                        Two independent voltage comparators. ( Replace capacitors if they go to any pins on this chip )
                        ---------
                        LM324AN
                        Four independent operational amplifiers (op amp) ( Replace any capacitor that goes any pin to this chip )
                        ---------
                        4N25
                        Single channel phototransistor coupler ( most important capacitor to change if any pin has a capacitor to it )
                        ---------
                        See above for my comments
                        Last edited by sam_sam_sam; 07-03-2020, 10:58 AM.
                        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


                          #13
                          Re: APC BackUPS LS-500 Schematics?

                          Originally posted by cook View Post
                          The 'Replace Battery' alarm comes on with a load, and without any load.

                          I will find a more items to plug into it and run it to see if anything changes. I will run it plugged in to AC, and running on the battery.
                          I was afraid of this that this might have been the case thanks for sharing this information
                          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


                            #14
                            Re: APC BackUPS LS-500 Schematics?

                            Originally posted by budm View Post
                            How many Watts is your actual load that you were having problem with? Notes: I am not talking about the 100W bulb.
                            You can also add another 100W load to see what happen.
                            I ran it connected to AC, running these lights: 40 watt incandescent, 60 watt incandescent, and a 150 watt halogen. The 'replace battery' LED came on briefly about 2 minutes into the test, then 5 minutes later, then 3 minutes later. Then I turned off the power to the AC, and it switched to battery. It runs fine on battery and the 'replace battery' LED does not go on. I ran it about 5 minutes like this and then stopped the test.

                            Comment


                              #15
                              Re: APC BackUPS LS-500 Schematics?

                              Got across this schematic today while doing backups. Hope this helps.

                              BTW: on your second picture there are 2 relays and 2 brown capacitors. The top brown capacitor looks to me bad.
                              Attached Files
                              Last edited by CapLeaker; 07-04-2020, 01:24 PM.

                              Comment


                                #16
                                Re: APC BackUPS LS-500 Schematics?

                                Originally posted by CapLeaker View Post
                                Got across this schematic today while doing backups. Hope this helps.

                                BTW: on your second picture there are 2 relays and 2 brown capacitors. The top brown capacitor looks to me bad.
                                Thank you for the schematics!!

                                And thank you for noting that cap. I just looked closely at it, and it is has a slight depression across part of the top. It almost looks like something pushed into it because the metal on the top appears to have a small scratch or depression in the metal like something sharp pushed it in. It might even have a tiny hole in it, but I am not positive. I will certainly test that one further to see how it looks. It is a KMG Cap, ie. Nippon Chemi-Con

                                Comment


                                  #17
                                  Re: APC BackUPS LS-500 Schematics?

                                  Originally posted by CapLeaker View Post
                                  Got across this schematic today while doing backups. Hope this helps.

                                  BTW: on your second picture there are 2 relays and 2 brown capacitors. The top brown capacitor looks to me bad.
                                  The circuit diagram that you posted I only find one relay not two of them and I look for it for a while
                                  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


                                    #18
                                    Re: APC BackUPS LS-500 Schematics?

                                    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.
                                    Last edited by CapLeaker; 07-04-2020, 02:39 PM.

                                    Comment


                                      #19
                                      Re: APC BackUPS LS-500 Schematics?

                                      Originally posted by CapLeaker View Post
                                      For me, I'd ESR the sh*t out of them caps and replace them.
                                      I would recommend this as well I more or less said the same thing earlier
                                      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


                                        #20
                                        Re: APC BackUPS LS-500 Schematics?

                                        sam_sam_sam,

                                        I am currently identifying what capacitors are connected to the pins on the chips.

                                        Am I only interested in the caps that are first component I find on the trace, or should I be going further down the trace through a few components?
                                        Last edited by cook; 07-04-2020, 07:50 PM. Reason: Typeo

                                        Comment

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