Induction Cooker Repair
This Induction Cooker was brought to me with the complaint that it is intermittent, and some of the control switches do not function. After opening and doing a thorough cleaning of inside, PCB and other parts, I removed the main board for visual inspection and troubleshooting.
I noticed that the solder side of the PCB was covered by varnish and I could make out a lot of dry solders.
I also removed the 0.27 mfd Cap connected across the coil. See what I found:
Here is the picture of the other side, which is after removing the large high voltage capacitors for check up:
I removed and checked the other high voltage capacitors on the board and could not find anything wrong with it and these were reading perfectly well. ESR was also ok.
So, started the process of cleaning the solder side of the PCB to remove the varnish to retouch the dry solder points. After several attempts of applying Thinner and rubbing with Metal Brush, and scraping with a knife in certain places, I could succeed in exposing the solder joints. Retouched all the points with fresh solder. Checked the ESR of electrolytic capacitors on the board (about 6 of them values of which were 100/25, 4.7/450, 4.7/63 etc.) and found them to be either at the brim or exceeding. So, replaced all the 6 electrolytic capacitors.
Checked the switches on the control board and found these were showing resistance, when pressed, indicating improper contacts. So replaced all the 6 defective press-to-on button switches. Since the buttons were slightly longer than the one on the board, I nipped the extra length with a tile cutter tool. Here are the pictures of the tool and the defective switches and the control panel board after replacement (before nipping the extra length).
After completing the work, put the PCB and other parts back into the cabinet:
Connected the control board, and kept the top of the Induction Cooker without screwing. Tested it keeping a vessel with water and switched it on. It worked very well and all the switches were also functioning properly.
Fixed the back screws and did polishing and cleaning of the surface and made it look like a new one. Another job completed satisfactorily.
This article was prepared for you by Parasuraman Subramanian from India. He is 66 years old and has more than 30 years’ experience in handling antiques equipment Valve Radio, Amps, Reel Tape Recorders and currently studying latest techs classes conduct by Kerala State Electronics Technicians’ Association. He was a BBA graduate, retired as MD of a USA company.
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You may check on his previous repair article related to Induction Cooker below:
https://jestineyong.com/no-heating-in-avon-induction-cooker-vq16-solved/
and also his previous latest repair article:
https://jestineyong.com/how-to-repair-microwave-oven-not-heating/
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19 Comments
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Yogesh Panchal
August 4, 2016 at 8:50 pm
Good Repair sir,
patrick motley
August 4, 2016 at 9:47 pm
Great job!
sanjoy
August 4, 2016 at 11:30 pm
I like,this news.
Albert van Bemmelen
August 5, 2016 at 12:50 am
Thank you Parasuraman S. Good job on repairing those devices that are dangerous when handled wrong. Though I only use Thinner to get rid of old Solder Fluids. And also for cleaning CPU Coolers from their old Paste before adding new Cooling Paste. Something that is an inadequate job when using plain Alcohol. But maybe you better try to remove the old varnish with Nail Remover or Aceton. I also learned a trick from a friend to use Instant Nail Glue instead of plain Superglue to repair all kinds of broken stuff. And indeed it not only did glue it very well, but really also in just seconds !! They sell 2 mini bottles of 3 grams of Nail Glue (called Fing'rs) both together for about less than 5 Euros (or US Dollar which is almost the same in value I guess). And it is a SuperProduct made in Taiwan but Packaged in the USA !!
Parasuraman S
August 5, 2016 at 7:37 pm
Nail Glue is news to me. Let me try. Thanks for sharing this.
Albert van Bemmelen
August 6, 2016 at 5:56 am
I've tested it and it really works! Only question remains how long everything will stay glued together.
But that same question goes for ordinary Super glue too I guess?
gabe
August 5, 2016 at 2:51 am
Good article. Thanks for sharing results
jed johnson
August 5, 2016 at 5:34 am
Nice Work!
Thank You For Your Tips!
robert allan
August 5, 2016 at 12:51 pm
Great work sir,you can't abondon us.......God bless u..........,
suranga bandara, Suranga Electronics
August 5, 2016 at 1:32 pm
Hi Mr- Subramanian ,
You done a very good and great repair.
Thanks for this.
Adebisi Adeitan
August 5, 2016 at 10:44 pm
Sir,I have à haier thermcool split unit air conditioner with a faulty PCB.The ac does not start at all.I can send a picture of the power supply to you.
Aloke Sett
October 27, 2016 at 1:40 pm
Heating low, fan &control panel function properly
Hilary
January 10, 2017 at 12:35 am
I bought a 4 plate induction cooker from Guangzhou China but unfortunately it doesn't have a brand name. The plates started developing faults one after another although the fault seems to be the same on each coil circuit. The problem is that when it is switched on, it would work for a few minutes, then it would stop working though the panel will show that it is working. If you move the utensil to another plate, it will also work for a few minutes then stop working until after maybe 10 minutes. Am an electrician from Zambia though am not experienced in electronics, what could be the problem that has caused this failure?
Parasuraman S
August 27, 2017 at 1:09 am
It could be in timer mode!
Anthony Muthu Xavier
September 7, 2017 at 10:33 am
Thanks for your instructions. Great you still have the enthusiasm to serve people with the knowledge you gained throughout your life long experience.
Nitin Rajpoot
September 14, 2017 at 3:58 pm
Thanxx for sharing sir...i m repairing my induction...igbt and fuse get shorted when i connect induction coil...touch panel working correctly...i've changed s8550,s8050 and some jumpers were broken...replaced them too...can u tell me how to check booster capacitor with china multimeter..and how can i test all circuit with bulb series before getting another igbt get shorted.
Ruparamji
December 23, 2017 at 1:03 pm
Induction cooker IGBT problem
abthakur
February 7, 2018 at 1:02 pm
is it necessary to reapply the varnish on the track side of the PCB after the repair is done? what happens if varnish is not applied
Mahmoud
October 18, 2022 at 4:36 pm
Nice work well done...