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Electronic Kettle Not Turning Off MiracleMAX

By Jestine Yong on March 25, 2017

how to fix kettle that can't be turn off

Our electronic kettle at home had slowly been getting worse – not shutting off when it should. Some electronic kettles use a ‘sterile’ feature, where the kettle will boil for an extended period of time to ensure the water has been sterilized, but this was not the case with this kettle.

It just liked to keep boiling and boiling and boiling!!!

Now it was clear that it was not a power issue as the kettle would boil and variable temperature settings would work – sort of…..

After checking on the internet, it was found that this seemed to be a common problem with this and other brands.

Disassembly included a Tri-Wing safety screw which was removed using a tool that came with an iPhone touch screen replacement kit. Stay tuned for that repair in a future article!

Unfortunately, I couldn’t find a schematic or anything similar, so checking the basics seemed a logical diagnostic path to start with. The circuit is made up of 2 IC’s, a series of resistors, an electrolytic capacitor and a touch pad switch system. I felt there was no need to check the power supply side of things as the kettle was powering up OK and the fault was not occurring in this area.

After testing the NTC resistors, the series of SMD resistors checked out OK. It looked like it might be an IC fault, but before checking all the voltages and outputs at these components, a single electrolytic capacitor needed to be tested.

Using the Blue Ring ESR Meter, the 10uf 25 volt capacitor registered a reading of 2.6, far above the maximum reading of 1.5!

As usual, I decided overkill was the best answer to this problem. I had in stock a 10uf 63 volt capacitor, which soldered nicely into place.

It was noted that the base used a series of contact points to provide continuity from the high voltage supply to the element used to heat the water. While the kettle was in bits, it seemed like a good idea to clean all the contact points with an eraser to remove any oxidation.

After assembly, there was only one thing left to do – boil the kettle. A nice cuppa is the reward of hard work and now the kettle shut off when it was supposed to.

Now, where are the tea bags kept………?

If you are interested in a video of this repair, please follow the link below:

This article was prepared for you by Mark Rabone from Australia.

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Note: You can check out his previous repair article below:

https://jestineyong.com/lg-microwave-oven-ms3840sr-repair/

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Kettle Repair

8 Comments

Parasuraman S

March 25, 2017 at 1:11 pm

I like your style of putting things up! It keeps up our spirits! Good job!

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- Mark
  
  March 26, 2017 at 2:50 pm
  
  That's a compliment coming from a master like yourself!
  
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Albert van Bemmelen

March 25, 2017 at 1:53 pm

The Tea bags are here Mark! (LOL).
It are often those e-caps that keep having a limited working life.
Maybe someday the long life electronic replacement e-cap version (nano electronics?) will be invented that do no longer make use of any drying up electrolyte?

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- Mark
  
  March 26, 2017 at 2:51 pm
  
  Would love to share a cuppa one day.
  The Ecaps seem to be the cause of many problems. Someone out there must be working on a better system. Hopefully we will see them.
  
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Henrique Jorge Guimarães Ulbrich

March 25, 2017 at 11:45 pm

I don't believe that it is not possible to produce good quality e-caps . Doing it is not a "seven-headed hydra". No advanced technology is required. E-caps has been produced for decades, with a dominated technology. No doubt that the answer is: planned obsolecence.

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- Mark
  
  March 26, 2017 at 2:53 pm
  
  Totally agree, Henrique! The older electronic appliances used to last for decades, now we are lucky if they last until the next model comes out.......what a surprise!!!
  
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Gerald Musy

March 26, 2017 at 3:53 pm

Hi Mark,
Nice video, also I like your IR temperature meter. Where did you get it from? And the lizard too 🙂

BTW where do you live in Australia? We are going to Oz land in September (to renew the wife's driving license). If it is in your area I might pop up for a cuppa, if the kettle is still working 🙂
Cheers,
GM

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Mark

March 26, 2017 at 4:50 pm

Hey Gerald,
You can get the IR thermometer from Ebay or other websites for next to nothing. They are a handy meter to add to the toolbox.

We live in New South Wales, near Sydney and yes, you are welcome.

The lizard and his friends have been a scene stealer and icon for most of my videos and yet there are very few people that either notice them or comment on them. Just for laughs! They are very impressed by your patronage.....

Cheers

MAX

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