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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