Power Flickering Caused IGBT Failure In IMPEX OMEGA H-5 Induction Cooker
There was an SOS call from my wife once again from the kitchen, though after a pretty long time (Last failure of IGBT in this was in June, 2019) She said that the IC (Short form being used by me for Induction Cooker) was not getting on and there was a power failure in a portion of the kitchen/work area. I checked the switch box and found that No.10 MCB had tripped.
As per a list provided by me inside the switch box, this covers the power connections in the Kitchen and work area. I asked her to switch off the IC and then switched the MCB on and found it to be ok. Then I asked her to switch on the IC, resulting in MCB tripping again. This was a clear indication of shorting of the IGBT, which I was expecting to happen due to frequent power fluctuation and flickering taking place in our area.
I brought the IC to my workshop (front bed room converted as workshop) and opened the set. Did a general cleaning though there was not much dust inside. The short blow fuse was intact. So, after dismantling the boards, straightaway I removed the IGBT and tested it. It was dead short and was the culprit. In order to ensure that it has not failed due to any defective components, combed the entire board, removing IC from its socket, a few transistors, one end of a few resistors etc. I did not find any defective component in the entire board.
Same was the case in the control board also. As I had already replaced all the electrolytic capacitors once in this IC, I just checked the ESRs and found these to be ok. After making sure that there were no other defects, I replaced the IGBT, re-assembled the boards. As its fan was getting stuck occasionally, upon which I used to turn the IC and give a strong tap on the outer net to make it run, I decided to replace it, having opened the cooker. So, in a way, this service made that also possible, i.e., double benefits!
Then kept the top cover without fixing it with the screws, took it to kitchen and switched it on courageously. As I was happy to have found it working, heated up a cup of water and allowed it to run for a few minutes more using it to heat up the milk etc. Then switched it off, brought it to workshop and fixed all the screws. Job accomplished with multiple benefits, and satisfaction got collected to its usual place! My wife was happy once again on a quick fix done!
This article was prepared for you by Parasuraman Subramanian from India. He is 71 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/backlight-replaced-and-led-driver-bypassed-in-lg-led-tv-model-32lf561d-tf/
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Albert van Bemmelen
January 12, 2021 at 9:11 pm
Bringing the IC (as you called the Induction Cooker) to your IC (your Intensive Care being the bed room converted as workshop LOL) already must have helped to fix many previous repairs. Good thing that you had this special IGBT FGA25N120 in store. Thanks for sharing!
Parasuraman S
January 12, 2021 at 10:11 pm
Many thanks! I enjoyed the humor!
Waleed Rishmawi
January 13, 2021 at 12:02 am
Mission accomplished indeed; successful repair and a happy wife. Just make sure you do the clean up after you are done otherwise wife is not happy anymore.LOL. Good repair my friend. Thanks for sharing
Parasuraman S
January 13, 2021 at 9:26 am
Oh! Yah! Surely! (LOL) Many thanks for your comments!
Gassan Ali
January 13, 2021 at 2:03 am
While the master of inverter welding machine repair is Waleed Rishmawi, the master of induction cooker is Parasuruman. Great work as always.
Parasuraman S
January 13, 2021 at 9:28 am
All of us masters in our own way in one thing or other! These mastery depends on our mind set, that's all! Of course, knowledge and experience is a must! Many thanks for your compliments!
Mark
January 13, 2021 at 5:58 am
Well done Parasuraman!
Happy wife, happy life 🙂
Parasuraman S
January 13, 2021 at 9:28 am
Ha! Ha! Many thanks for your comments!
Yogesh Panchal
January 13, 2021 at 6:32 pm
Sir,
What could be the reason for IGBT Failure??? As you have mentioned fuse was intact but MCB Getting tripped there could be some circuit design fault?? because fuse is not blown.....
Parasuraman S
January 14, 2021 at 5:40 pm
The fuse used in this is a slow blow type. If the Ampere rating of the Fuse is higher than that of the MCB, MCB will trip first. The MCB that I have used in my home is that of fast response. There are types with different delay timings for trip off, depending on the type of load. That's why it happens this way! Many thanks for your comments and observations! Kindly see the following link for more details on MCBs
Yogesh Panchal
January 17, 2021 at 12:22 am
Thanks! sir for providing the link.
Parasuraman S
January 17, 2021 at 5:15 pm
Many thanks!