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KSGER STM32 T12 soldering stations

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    #31
    Re: KSGER STM32 T12 soldering stations

    Originally posted by clearchris View Post
    Thanks for the heads up, I was considering getting a KSGER, will definitely not get one with the internal power supply now.
    WAIT, there are different 24VDC power supplies used in these T12 soldering stations. Realistically, they only need to put out 75W (3A) for short periods, not all the time so there are some super el-cheapo's out there, as well as good ones.
    KSGER store has decent ones that run cool and last, but the safety ground and clearances/isolation needs to be checked as it's always done poorly in china.
    The recent T12 PSU is this, it has undersized mains capacitors 22uF x2 and small rectifier diodes, for a "24V 4.5A 108W" rating. I haven't used one but it has a scary ground trace!
    Attached Files

    Comment


      #32
      Re: KSGER STM32 T12 soldering stations

      Originally posted by kkolding View Post
      The PSU can't hold a steady 24V it switches between 19-30V on the output side. The red LED on the output side keeps blinking. And when I plug in the digital control board to the PSU it turns on but keeps giving me an error. As soon as I plug in a tip it can't deliver enough power and turns the display on and off.
      I have tested the tips to check if they are shorted but they seem fine.

      at first, I suspected that it was the power MOSFET so I replaced that with a Vishay model instead "http://www.farnell.com/datasheets/2687488.pdf".

      Also swapped out the 400v capacitor with and Samsung brand instead.

      With those replaced, I still have the same problem.

      I'm a noob, so I'm just trying to mess about with the knowledge I have.
      It sounds like the power supply is hiccupping and going into overvoltage shutdown if you are seeing 30V output blips. It might not be the SMPS IC, but caps or opto or TL431.
      I would not connect it to anything- they have 1k dummy load resistors and you should get about 25V output, stable.
      Need a pic of the board to see what design it is. I would check the smaller electrolytic capacitors like 10uF or 47uF 50V and the output capacitors to see if they are low value.

      Comment


        #33
        Re: KSGER STM32 T12 soldering stations

        Originally posted by redwire View Post
        WAIT, there are different 24VDC power supplies used in these T12 soldering stations. Realistically, they only need to put out 75W (3A) for short periods, not all the time so there are some super el-cheapo's out there, as well as good ones.
        KSGER store has decent ones that run cool and last, but the safety ground and clearances/isolation needs to be checked as it's always done poorly in china.
        The recent T12 PSU is this, it has undersized mains capacitors 22uF x2 and small rectifier diodes, for a "24V 4.5A 108W" rating. I haven't used one but it has a scary ground trace!
        They sell smaller units that don't have an internal power supply. I have a bunch of 19.5v 4.5a (supposedly) laptop power supplies that have worked fine for years, but have broken cords. I can easily repurpose one for a power supply. No big deal. If I really wanted to go overboard, I could probably print an extension for the case to house the laptop power supply and give the unit some weight.

        I don't think KSGER units are being faked, yet.

        Comment


          #34
          Re: KSGER STM32 T12 soldering stations

          I have the first revision of the board the one that you made a schematic of.
          I stole a TL431 from a faulty PS4 PSU, replaced it now works fine. Thanks! =)

          Comment


            #35
            Re: KSGER STM32 T12 soldering stations

            Hi would anyone happen to know the value of SMD cap C20 on the power board? Mine has blew and would like to replace but can't find the value anywhere
            Board version is V2.01
            Thanks!

            Comment


              #36
              Re: KSGER STM32 T12 soldering stations

              I have 2 new ksger t12 soldering stations version 2.1, both are DOA. I have replaced all fuses, electrolytic capacitors, bridge rectifiers, inductor, and checked other capacitors and resistors. Checked FQPF20N60 Mosfet transistor and MBR20200CT Schottky Diode all are good still no dc output. These power supplies are like the good ones in the left illustrations. Bangood has refunded the fees I paid less the expedited shipping and told me to keep the soldering stations. Where to go next? I don't know if this is the way to post on this forum so please help me with the proper way to post.

              Comment


                #37
                Re: KSGER STM32 T12 soldering stations

                I have 2 new ksger t12 soldering stations version 2.1, both are DOA. I have replaced all fuses, electrolytic capacitors, bridge rectifiers, inductors, and checked other capacitors and resistors. Checked FQPF20N60 Mosfet transistor and MBR20200CT Schottky Diode all are good still no dc output. These power supplies are like the good ones in the right illustrations. Bangood has refunded the fees I paid less the expedited shipping and told me to keep the soldering stations. Where to go next?

                Comment


                  #38
                  Re: KSGER STM32 T12 soldering stations

                  Look for a switching power supply regulator ic chip it could be a surface mount ic chip or a 5 pin or more device if you can find the part replace it or make sure you have power to this chip

                  You can power them from a 24 volt power supply will the soldering controller power on
                  Because you can power the soldering station from a 24 volt 3 amp power supply

                  Make sure that the soldering controller board works because I got one that the controller board was DOA and I was not able to get it to work ( I end up parting it out )


                  Or

                  a 24 volt battery pack
                  Last edited by sam_sam_sam; 08-05-2020, 06:09 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


                    #39
                    Re: KSGER STM32 T12 soldering stations

                    Hi,
                    I have an KSGER T12, which kept detecting movement of the handle even so the handle was resting in the cradle. Looking at the schematics of the control board that must mean that the 3.3V on the input at the STM32 must be missing.
                    Measuring with a normal multimeter everything looked fine. Stable 24V of supply and 3.3V at the chip.
                    After poking around with an oscilloscope I found that I have really short drops in the supply voltage, which I guess lead to the 3.3V missing.
                    After attaching the control board to a laboratory psu the board works fine.

                    So the question is, what could be wrong with the psu?

                    Attached are some pictures of the psu.






                    Maybe I could also provide an picture of the oscilloscope (its an old analog one, so I would need to try to capture the correct moment with my camera).

                    Any ideas at what to look at? The caps look ok, soldering seems to be ok too...

                    Thanks and Greetings
                    Christian

                    Comment


                      #40
                      Re: KSGER STM32 T12 soldering stations

                      is the 24v dropping out, or the 3.3v?

                      Comment


                        #41
                        Re: KSGER STM32 T12 soldering stations

                        Check the handle and its wiring. The shake switch can be installed upside down or wired wrong and it picks up noise.

                        Here is the schematic for your KSGER 24V power supply at post #3.

                        I doubt anything is wrong with it (PSU), aside from grounding. The 24VDC(-) should connect to earth ground for safety and noise.
                        The newer OLED-V3.0, OLED-V3.1 controller boards have an extra GND pad where you can solder a wire to, and then connect to a GND on the metal enclosure and IEC connector.
                        That also might fix the shake switch problem, if it is due to noise.
                        Last edited by redwire; 01-20-2021, 01:33 PM.

                        Comment


                          #42
                          Re: KSGER STM32 T12 soldering stations

                          Hi, I would like to replace the three capacitors of my KSGER T12's PSU. Don't trust the cheap chinese Chongx caps after hearing stories about leakage and "exploding" soldering stations after ten months use...

                          - 1x ChongX VEHT, 82µF, 400V, diameter: 16mm, height: 25mm (not much room to the sides and top)
                          - 2x ChongX VEHT, 1000µF, 35V, diameter: 10mm, height: 20mm

                          Which ones should I use? Can't find a datasheet for ChongX caps and unsure about ESR and ripple values.

                          Comment


                            #43
                            Re: KSGER STM32 T12 soldering stations

                            for the 1000uf caps, can you fit 12.5mm diameter??

                            Comment


                              #44
                              Re: KSGER STM32 T12 soldering stations

                              Primary cap was 68uF 400V 16x26mm and KSGER increased to 82uF. I couldn't find any 82uF 16x26mm caps at 400V. The heatsink and Y-cap are near it, so 18mm dia. would be really tight and hit the Y-cap. One problem is the low height, maximum 27mm. It must be a laptop brick cap. I have Ltec there.

                              The two 1,000uF 35V 10x20mm caps could go taller.
                              I think you could barely stuff in 12.5mm dia. parts, one cap has SMT resistors nearby. I have green Sanyo there.

                              Because the PSU is only under full load 3A for short periods, the caps are not highly stressed I think and ESR not so important.
                              The mains fuses are way too big, so if the mosfet shorts, many parts get damaged first and better off to throw the PSU in the garbage than try fix it.

                              Comment


                                #45
                                Re: KSGER STM32 T12 soldering stations

                                panasonic FS 10x25 for the 1000uf 35v
                                Attached Files

                                Comment

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