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IGBT Found Blown In IMPEX Induction Cooker

By Jestine Yong on August 10, 2019

Those of you, who had read my article on servicing Prestige Impex Cooker (https://jestineyong.com/caution-never-keep-one-induction-cooker-on-another-for-testing-a-lesson-learnt/) , may know the background of this case. As mentioned therein, I opened the set and found IGBT short. Anyhow, I was planning to open this cooker, clean and do some preventive maintenance, which was made possible by the other cooker!

After dismantling the whole cooker and subjecting it to a thorough cleaning and wiping, I brought it to the service table. Replaced the IGBT and all the electrolytic capacitors on the board. Did a thorough dry solder patch up on main board and the panel board. This cooker does not have any micro switches and works on touch. I am giving below a few pictures of the board as well as the ICs used for reference.

The first IC is the display control IC, second one is its uController and the third one is the PWM.

Reassembled the unit and took it to the kitchen for checking and found it to be working very well!

Whole work was over in an hour, which drew appreciation from my wife! (Obviously, I never shared the real reason for its failure, respecting the international set policy for ‘secrecy’ of husbands, followed by many like me in the world! (LOL).

Here is the picture of defective components replaced. Also is a picture of the new IGBT’

Well, well, well, this too got added to my satisfaction bag, though a result of a good lesson learnt!

This article was prepared for you by Parasuraman Subramanian from India. He is 69 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.

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You may check on his previous repair article below:

https://jestineyong.com/shorted-zener-diodes-caused-no-sound-in-lg42lb6250-tv/

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Induction Cooker Repair

19 Comments

Anwar Shiekh

August 10, 2019 at 6:49 pm

No picture of the Insulated Gate Bipolar Transistor?

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- Parasuraman
  
  August 12, 2019 at 11:22 am
  
  Now that has been included. Thanks to Mr. Jestine Yong!
  
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Albert van Bemmelen

August 10, 2019 at 7:46 pm

It is not often that a repair was successfully done without having had to replace even a single e-cap too! You not only made your wife happy but also made sure that good meals again could be prepared and served which completes any good day. By-the-way: very good photos too. Those VIPer IC's are quite interesting designs. Like the Low power Off Line Primary Switchers LNK304/305/306 in Washing machines and Dryers but with the extra PWM controller.

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- Parasuraman Subramanian
  
  August 10, 2019 at 9:07 pm
  
  Looks like you have overlooked 'I brought it to the service table. Replaced the IGBT and all the electrolytic capacitors on the board....' Unfortunately, as pointed out by Anwar Sheikh in the first comment, I forgot to click the defective components, perhaps in my excitement and the resultant hurry, to 'appease' my wife (and to escape from getting caught on my foolishness)! (LOL)
  
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Ghashaan

August 10, 2019 at 9:02 pm

IGBTs seem a common point of failure. In what type of circuits are they used?

Thank you for another enlightening article.

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Parasuraman Subramanian

August 10, 2019 at 9:42 pm

Consequent to the comments made above, I rechecked and found the picture of the replaced components and the new IGBT, which I have sent to Jestine Yong for inclusion. I am sorry for this omission in the article! (So it was a case of 'forgot to click' as assumed by me, but 'forgot to include in the article', a mistake, with a 'lesser' degree! (LOL)

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Mr Teak

August 10, 2019 at 10:18 pm

Your bags must be swelling more than father christmas there Parasuraman!
>;o)

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- Parasuraman Subramanian
  
  August 11, 2019 at 8:02 am
  
  Yah! Looks like, SC might ask for it for distribution during the coming yearly event, in which case, I will only be too glad to give it off! (LOL)
  
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Robert Calk Jr.

August 11, 2019 at 12:46 am

Good job, Parasuraman! Now you can have a hot meal.

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beh

August 11, 2019 at 3:37 pm

WONDERFUL just by replacing the electro caps the machine returned to life again that is why I am telling always we have to replace the electros caps even without any prior notice well-done.

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- Albert van Bemmelen
  
  August 11, 2019 at 11:17 pm
  
  Hi Beh, it were not the e-caps that caused any problem before. So there was really no need to replace the e-caps just yet (I mainly replace parts only if the device requires a full rework to get it working again. Or if the results improve afterwards like in Audio- or Video Amplifiers). It just was the IGBT that needed to be replaced. Caused by the other repaired induction cooker that induced energy to this now repaired cooker. But I have no idea what Parasuraman meant with : "SC might ask for it for distribution in the coming yearly event".
  
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  - Parasuraman
    
    August 12, 2019 at 11:20 am
    
    The reply was to Mr Teak, who commented that my satisfaction bag might be bigger than that of Father Christmas. SC stands for Christmas Father, Santa Claus!
    
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    - Albert van Bemmelen
      
      August 12, 2019 at 5:30 pm
      
      Understood dear Parasuraman. Wasn't thinking about that at all because Santa Claus is also still a bit too soon now.
      Today I bought a couple of those FGA25N120 for future repairs on Induction Cookers like yours. Always a good idea to have these special components at hand.
      
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Yogesh Panchal

August 11, 2019 at 10:16 pm

Good job Sir!

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Waleed Rishmawi

August 12, 2019 at 7:46 pm

a job well done on the repair. I never opened such devices before but thanks to your article i have an idea. thanks for sharing

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Shiva

August 13, 2019 at 12:00 am

Dear Sir, thanks for sharing good article. I have a Haier stove changed the IGBT as well bridge. The stove showing error of E0. What to do...
Shiva

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- Parasuraman S
  
  August 13, 2019 at 9:36 pm
  
  Please check for bad capacitors (large black ones) and also the coil. If the induction coil is heavily corroded or blackened, the induction might not take place properly and the uController will stop the pulse generation, sensing the current. Kindly visit https://www.youtube.com/watch?v=p2RYn2IPYXI&feature=youtu.be for an informative video.
  
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Shiva

August 13, 2019 at 5:32 pm

Thanks you Sir, very useful article.

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Jon

February 19, 2021 at 9:51 pm

Hi, my igbt is short, it is 20a 1300v,
Can i replace it with 600v 40a?
My ac volt is 220v

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