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18VDC PSU has dropped to 10v - ZD-915 desoldering station

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    #61
    Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

    Originally posted by stj View Post
    now another tip.
    dont spend money on filter discs

    but an A4 size sheet 0f 3mm ceramic wool gasket.
    like this: https://www.ebay.co.uk/itm/223837165275

    and a leather punch.
    like this: https://www.aliexpress.com/item/32826370605.html
    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


      #62
      Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

      Originally posted by stj View Post
      it isnt 18v to the fan, because it goes through a couple of wirewound resistors.
      the fan is shit though. i replaced mine with a sunon maglev fan and a 9v buck convertor
      Right you are! Actually, I measured at the fan connector after the resistors and it does still read 18v going to the fan. So I decided to replace the 12v fan with a Suncom 24v ME50152V1 which draws 2.8w. The unit is much quieter and holds temperature better (less peaks and overuns in temperature listed on the lcd screen). My guess is that the loud whining 12v fan was inconsistent in voltage/amperage draw due to running above spec and was causing instability issues in temperature This is the fan I got: (sh*t fan on left, good one on right) probably some bean counter decided to reduce costs on the fan.
      Attached Files
      Last edited by hdtvman; 02-03-2021, 11:19 AM.

      Comment


        #63
        Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

        Originally posted by hdtvman View Post
        more pictures as requested :-)
        main board has 110vac coming in and 164v dc at transformer primary and also at T1 transistor. Nothing at all coming out of the secondary. did not see an obvious F1 thermal fuse - maybe its internal to the transformer... (edit: just read above post - these don't have any - thanks!) also no voltage going out to secondary boards (LCD and controls) no 5v or 18v at the connectors. Reflowed all the dubious solder joints, no joy.
        I guess it took a shit again

        Well I have some answers to the question about why this Desoldering station did not work correctly
        Yea I know that this is a old post but he reached out to me about trying to repair it and this is what I found out

        Two of the winding are shorted so it has seen better days
        Attached Files
        Last edited by sam_sam_sam; 04-09-2022, 06:16 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


          #64
          Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

          re-wind it

          Comment


            #65
            Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

            Originally posted by stj View Post
            re-wind it
            I have three issues with doing this

            One where do you get the correct diameter winding wires from which is the biggest problem

            Second where do you get the wrapping tape from

            Third I have never done this before

            However I have watch YouTube video on how it is done

            Can you please offer some advice the first two issues and I will figure out the last one
            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


              #66
              Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

              you can watch diode gone wild for unwinding them,
              wire diameter can me determined - tape can be capton
              https://www.youtube.com/channel/UCQa...B_Kd54g/videos

              if your lucky, they may be touching at the base where they go to the pins and you could seperate them and insulate with some laquer

              Comment


                #67
                Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

                Originally posted by stj View Post
                you can watch diode gone wild for unwinding them,
                wire diameter can me determined - tape can be capton
                https://www.youtube.com/channel/UCQa...B_Kd54g/videos

                if your lucky, they may be touching at the base where they go to the pins and you could seperate them and insulate with some laquer
                I have watch his videos before on this

                But my question is where do I buy the right winding wire to do this with

                I would not trust this wiring because it already has this issue I want to use good quality wire
                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


                  #68
                  Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

                  use a digital caliper to check the original wire,
                  you can buy rolls of enamelled copper wire from the usual places - or just unwind some junk transformer.

                  Comment


                    #69
                    Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

                    Originally posted by stj View Post
                    use a digital caliper to check the original wire,
                    you can buy rolls of enamelled copper wire from the usual places - or just unwind some junk transformer.
                    What just old fashioned transformer would work I will have to try this
                    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


                      #70
                      Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

                      it's just coated copper wire

                      Comment


                        #71
                        Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

                        I have modify one of my Desoldering stations with a 24 volt fan instead of the 12 volt fan that is in it I will see how well this works very soon I also have another one that the fan has also gotten noise so I need to replace it before it starts squeaks real loudly
                        Last edited by sam_sam_sam; 04-15-2022, 09:07 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


                          #72
                          Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

                          Originally posted by sam_sam_sam View Post
                          I guess it took a shit again

                          Well I have some answers to the question about why this Desoldering station did not work correctly
                          More damage found two of the 4 diodes shorted on the main power supply rail to the regulator ic chip now waiting for diodes from EBay to show up to see if the spare switching power supply transformer is going to work correctly on this board or are there more issues and damage to this board

                          I also I have a feeling that the switching power supply regulator that was replaced might be a fake because the company logo does not look right for some reason because the detail is not in the logo like it should be I have also replaced my before and I bought them from Digikey and I know that those are real

                          Also there is a trace on the board where one of the pins to the switching power regulator is like burned off it is repairable but not easily because of the pins are so close to each other
                          Last edited by sam_sam_sam; 04-15-2022, 09:03 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

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