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Dead Microwave Oven Restored

By Jestine Yong on October 7, 2023

This Kenwood Microwave Oven belongs to my family and I was using it to cook about a year ago in kitchen when suddenly I heard a pop sound and oven stopped working.

So I checked on a/c plug, noticed fuse was burnt, removed back case of oven and did visual checks, didn’t see anything suspicious. Then I did troubleshoot all H.V components: cap, diode, fuse, transformer, magnetron….all tested good. Then check on the three door switches…all good also.

So my suspicions is now on door board, pull it out and did physical observation..ooh I noticed a resistor like 2.2mh inductor(red red red gold color strips) broken into two, two caps close to inductor opened, power ic TNY 176(pins rusted) suspected to be defective, on other side of board, 0 smd resistor opened.

So I could get all bad components from retailers shop to purchase except the inductor value since last year, I even joined two inductors in series to make up the value, but one got burnt when I coupled it together and powered on.

So last month I revisited the oven and did the needful, replace inductor with a lower value, as suggested by a retailer components seller, assembled everything together and powered on.

Oven switch on and perform without any problems and since last month it has been doing well, so far so good.

Last picture shows ‘plantain’ being grilled(my country delicacy).This is the finished repaired work.

This article was prepared for you by Imoudu Onwumah from Nigeria. He is 62 years old and has just 3 years experience in electronics repairs. I started career in hotel industry as a chef, but then I was doing repairs only in electrical repairs as a hobbyist. In 2018, I decided to learn about electronics which through Jestine’s electronics e-books and holding my hand, am an electronics techie today.

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Note: You can read his previous article on Dead TV Back To Life

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microwave oven repair

5 Comments

Albert van Bemmelen

October 7, 2023 at 2:44 pm

I wouldn't have suspected that such a small inductor would make such a difference to prevent it from burning through. I suppose it was here just an AC rimpel preventer inductor in the DC output voltage of both ecaps. Probably also using a thicker wired inductor coil would have solved it?

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Parasuraman S

October 7, 2023 at 5:57 pm

Good professional fix of a defect, which normally might escape even experts! Many thanks for sharing!

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Imoudu.O

October 8, 2023 at 2:40 am

Albert
I thought of using such inductor coil but my fear was of not breaking when problem comes since the original damaged coil is a preventive inductor.Thanks for your comments.

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Imoudu.O

October 8, 2023 at 2:41 am

Parasuraman.S
Thanks sir

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Yogesh Panchal

October 16, 2023 at 11:39 pm

Good fix! Imoudu.O

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