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LG Microwave Oven With “No Heating Symptoms” Now Repaired

By on December 26, 2020
LG Microwave Oven With “No Heating Symptoms” Now Repaired

I received this microwave from a customer with no heating symptoms. According to the customer it is a small problem since the machine seems to be working well. Microwave fan, bulb and the front keypad seem to be working well and setting cooking time is okay.

how to repair lg microwave oven

After setting the time you press the start button and the count begins to the end.

how to fix  lg microwave oven

You open the door slowly and carefully but after checking the load(water) you find it is still cold.

lg microwave oven problem repair

From my experience this problem is usually caused by failure of one the High Voltage circuit component which includes, High voltage transformer, High voltage capacitor, Magnetron, High voltage diode.

After checking these components, I found them all okay and now was left with one alternative. You can learn more about the microwave oven high voltage circuits and how to test the components in my latest book being sold at amazon here

To change the magnetron directly.

magnetron faulty lg

After changing the magnetron I re-assembled the oven and now the machine was working perfectly well.

magnetron mircowave oven faulty lg

Note:Unlike other home electrical appliances, microwave repair is the most dangerous,  both to the user and service personnel so it is very important to observe safety measures when working on this gadget.

Thank you friends

Stay safe

humphrey kimathi

Humphrey Kimathi is from Nairobi Kenya and he has just launched his new book “microwave oven repair made easy

You can also checkout his other ebooks below:

1) Lcd-Led television repair guide

2) DVD Player repair guide,

3) CRT Television repair course and

4) Basic Electronics course.

He is also a blogger at

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  1. Albert van Bemmelen

    December 26, 2020 at 6:35 pm

    A quick and to the point repair! I guess that the customer just had to wait a few weeks before the replacement Microwave magnetron element had arrived. Having these exact same parts in store is usually not the case.

    • Humphrey Kimathi

      December 30, 2020 at 2:18 am

      Luckily we have them in the market here in Kenya Albert.
      Regards Humphrey

  2. Parasuraman S

    December 26, 2020 at 8:54 pm

    Well done! Your quick reach to the trouble making component shows your expertise and sharp focus on causes!

    • Humphrey Mndaka

      December 30, 2020 at 2:20 am

      Thanks for your feedback my friend Parasuraman.

      Regards Humphrey

  3. Babu M S

    December 26, 2020 at 10:36 pm

    Fantastic it shows your expert in microwave oven repair works. Thank you very much for sharing.

    • Humphrey Mndaka

      December 30, 2020 at 2:22 am

      Thanks and Welcome Babu.
      Regards Humphrey

  4. Humberto

    December 27, 2020 at 10:41 am

    Good repair. Congratulations.

    • Humphrey Mndaka

      December 30, 2020 at 2:23 am

      Thank you Sir Humberto.

      Regards Humphrey

  5. suranga bandara

    December 27, 2020 at 12:45 pm

    Good Job..Mr.

    • Humphrey Mndaka

      December 30, 2020 at 2:25 am

      Thank you Mr. Suranga

      Regards Humphrey

  6. Yogesh Panchal

    December 28, 2020 at 2:59 pm

    Good job! Sir

    • Humphrey Mndaka

      December 30, 2020 at 2:26 am

      Thank you Yogesh sir.

      Regards Humphrey

  7. Tito Kanshulu

    January 4, 2021 at 9:09 pm

    Quite to the point Mr. Kimathi. Nice to hear one story from you


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