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Repaired An Electronic Welding Inverter. Model: Selco Genesis 140

By on June 8, 2013

A welding technician brought this welding inverter to my shop and the problem was, it does not weld. He said that it used to work but since he used a power generator to power up this machine, it stopped working. For your information, electronic welding machine is not supposed to run on power generators. That is the first warning in the user manual written in big highlighted fonts. A lot of people do not read the user manual before using the machine and that is really bad.

welding machine

I powered the machine and I could hear the fan running. When I tried to weld with it, it did not work and I could see a warning message on the display of the machine with a yellow LED on. I downloaded the user manual and the warning said, it had to do with overheating. I unplugged the machine and opened the cover and took a look inside of it. I could not see any burnt component there so I guess it is time to check for bad component. 

welding machine1

I checked some component on board and found three SMD diodes shorted out. Two of them had the part number 1016 and the smaller diode had DS6 written on it. I replaced them with working SMD diodes. I found another diode near the relay on that board and replaced it as well. All these diode replacement did not make a difference because the problem remained.

My thoughts were heading to replacing the computer chip on the main board because I think that is the main problem but I could not locate the replacement part. I sent the company a message asking for this part and they said they will send it right away.  The chip was not that expensive and the shipping fees were reasonable.

I got the chip installed. I turned the machine on and it came on and this time the yellow LED light did not come on. I plugged the welding cables in and tried the machine. It worked nicely. I could see the yellow LED comes on and off but not very often which I found later on that it is normal in this machine.

waleed rishmawi




This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment. Please give a support by clicking  on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.



  1. shihab kably

    June 9, 2013 at 3:08 am

    thanks for shedding light on other electronic repair fields

    • Waleed

      June 11, 2013 at 2:18 am

      shihab, you are most welcome

  2. Naseem

    June 9, 2013 at 12:36 pm

    hi sir,
    thanks for the report. could you tell us what type of welding machine it is? is it used to weld the metal? because the welding machine that I have seen are big and with big transformer. they do not have ic, diode, capacitor and so on...

    • Waleed Rishmawi

      June 11, 2013 at 2:07 am

      yes, it welds metal. this is an electronic welder. they used to make them big but now there are smaller and use electronic parts.

      • wesenu

        October 17, 2014 at 4:28 pm

        please help i wona to learn
        about electronics equipment

      • Musharik

        October 4, 2019 at 6:19 pm

        Hello Waleed Rishmawi
        Please I need your help

    • Waleed

      June 11, 2013 at 2:15 am

      hi Naseem
      it is used to weld metal. they are the electroic new ones. the big ones are used only in the shop because they are hard to move but the smaller new electronic ones, are used in the field. all has electonice part, smd and others.

  3. zed

    June 10, 2013 at 9:43 am

    Good tips. Did the replacement part like smd diode the same part number did you replaced or a substitute? if substitute? what part number?Thanks.


    • Waleed

      June 11, 2013 at 2:12 am

      no, I used the original.

  4. shehab kably

    June 10, 2013 at 12:29 pm

    Hi guys
    The service manual is here

    • Waleed

      June 11, 2013 at 2:17 am

      dear Shehab. thanks for sharing the user manual. yes, I have the same one that i got from the net and it has step by step repairing guides. enjoy.

  5. Naseem

    September 17, 2013 at 6:29 pm

    thanks for the information Mr.Walid,
    for me it is abit strange that how these components can work under that much load. I mean when a 3 or 4mm grill welding is being melted then under this much load how these small component can resist...?

  6. Emery Summers

    March 20, 2014 at 5:27 am

    I want to thank you for this artical,because this type of repair is the main reason I want to learn electronics repair,Thank You,Emery.

  7. Oliver H Oliversson

    August 3, 2014 at 5:43 am

    I have a Selco Genesis 140 and a friend of mine was welding with it and it just stopped working so i tested it and nothing, not even the fan came on.
    So he took it the the shop that services Selco and they said it was ruined because they don´t have the spare parts, what a service.

  8. ajay

    December 15, 2016 at 4:02 pm

    Why inverter welding machines give oc and how to solve this issue ???

  9. andrew

    June 26, 2017 at 9:13 pm

    can i have the image of that computer chip? i had a same problem with my welding machine..thanks..


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