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Electronic Circuit Turning On Itself Repaired

By on September 29, 2021
how to fix hair trimmer








A customer called me about a device that he owns. He explained that during the night he woke up to a sound of a machine working which he realized later on, it was his hair trimmer.

automatic on hair trimmer repair

The guy is a computer engineer who graduated recently from a college in Germany.

He had this trimmer for a while and now it is acting up. He brought the device to my shop for repair.

how to fix hair trimmer

It took me a while to figure out how to get this machine opened but finally I figured it out by taking the bottom hidden screw off then the whole thing was easy after that.

how to repair hair trimmer

As I was taking this device off I started to realize the cause of this machine working on its own.

If you look to the body of the machine you would see some water damage issue appearing.

hair trimmer circuit board repair

When I finally got to the main board I could see the water damage effecting some pins and components that needed some attention.

fixing hair trimmer

I have cleaned all these marked areas with IPA and then re soldered all the parts that needed soldering. My main focus was on the power switch and for that I used contact spray which made it look nicer and working better.

hair trimmer fixed

The motor is rusty on the outside but on the inside was fine but I sprayed some contact spray there and powered the machine for a while to lubricate it and it went really well.

how to fix and repair haird trimmer turning on itself

I put the machine back together; I let it sit in my shop the whole day and it did not work on its own. I called the customer to come and pick it up and to give it a try. The repair has been done about two weeks ago and I did not get any call from the customer regarding this repair which makes me assume that everything was working fine.

Mission Accomplished.

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

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Note: You can check his previous article on LG LED TV Logo Stuck Repaired




  1. Albert van Bemmelen

    September 29, 2021 at 1:34 pm

    Good job of course! Nothing can be more disturbing then waking up during the night by a sound, even knowing what generated the sound!

    • Waleed Rishmawi

      September 29, 2021 at 5:28 pm

      Albert: thanks man. according to the customer he freaked out because of it. have a blessed day

  2. Yogesh Panchal

    September 29, 2021 at 2:58 pm

    Nice fix!

    • Waleed Rishmawi

      September 29, 2021 at 5:31 pm

      Yogesh: thanks man. have a blessed day

  3. Mark

    September 29, 2021 at 3:55 pm

    Water and electronics? Who would have thought?

    • Waleed Rishmawi

      September 29, 2021 at 7:39 pm

      Mark: it said in the user manual that you can wash the head with water but that does not mean the head attached to the motor when washing... LOL. have a blessed day

  4. Parasuraman S

    September 29, 2021 at 4:24 pm

    Mission accomplished well and a clean shave ensured for the owner! (LOL)

    • Waleed Rishmawi

      September 29, 2021 at 7:40 pm

      Parasuraman: indeed so I hope he learned the lesson and not to wash the blades and the motor in running water. have a blessed day


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