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Shorted Mosfet 23N50E 

By on May 10, 2021
Shorted Mosfet 23N50E 

A welding technician brought this welding machine for repair with the complaint that it comes on but does not weld.

zika welding machine repair

Zika welding machines are expensive and also very good ones to have and operate.

The way it is built amazes me and I love to work on such machines.

how to fix zika welding machine

When I powered on the machine, the yellow warning Led came on indicating a short somewhere in the device and the machine is in the protecting mode.

how to repair zika welding machine

From experience, when I see this warning light come on I head directly to the Mosfets of the machine and sure enough it was giving me a short on two of the Mosfets there.

I started to take them off board one by one for check up and found that only one Mosfets was shorted causing the machine not to weld.

23n50e fet

As you can see, the part number is 23N50E and I have shared the technical sheet in previous article. I have plenty of these in the shop so right away I replaced the shorted Mosfet and scanned the machine for another fault before powering on.

fixing zika welding device

This welding machine was designed to give you the best welding but with that it is still a machine; the machine needs maintenance all the time. The customer informed me that this machine runs almost 8 hours a day and only gets half an hour break and that when they go for lunch.

how to repair and fix welding machine

I replaced the melted power plug and with an air blower I cleaned the dust from inside the machine and then I was ready for a welding test.

As you can see, the machine is up and running but of course that was not the ultimate test. I took it next door to my brother’s welding shop and gave it a try. Every was according to specs.

Mission Accomplished.

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.

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Note: You can check his previous repair articles in the link below:



  1. Parasuraman S

    May 10, 2021 at 12:08 pm

    The welding Master Service Engineer at work again! Good job!

  2. Waleed Rishmawi

    May 10, 2021 at 3:26 pm

    Parasuraman: thanks man. always a pleasure working on these machines. have a blessed day

  3. Albert van Bemmelen

    May 10, 2021 at 3:50 pm

    Obviously you were again able to fix another defect welding device!

    • Waleed Rishmawi

      May 11, 2021 at 2:44 pm

      Albert: yes and always I have the right part...LOL. have a good day

  4. Mark

    May 11, 2021 at 4:53 pm

    Well done Waleed,
    You are the King of all welders! 🙂

    • Waleed Rishmawi

      May 12, 2021 at 6:03 pm

      Mark: thanks man. I try to do my best. have a blessed day

  5. Yogesh Panchal

    May 12, 2021 at 3:35 pm

    Good Job! Waleed
    Melted power cord because of loose Connection in mains power socket??

    • Waleed Rishmawi

      May 12, 2021 at 6:06 pm

      Yogesh: thanks man. yes. this machine is used with a step down adaptor from three phase power down to two phase and the socket on that was melting so it affected the power plug on this cable as well.
      have a blessed day

  6. C Jandiseni

    May 27, 2021 at 12:34 pm

    Nice job done thank you for sharing


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