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Shorted Diodes Found In Makita Battery Charger

By on March 4, 2021
Shorted Diodes Found In Makita Battery Charger








An old man walked into my workshop carrying a battery charger that was totally dead and asked if I can repair it right away for it was urgently needed. I powered up the charger and sure enough there was no power indicator on the LED light on that charger.

makita charger repair

The light on that charger once it was powered on should be flashing green but in this case it was completely dead and needed repair.

makita power supply repair

The fuse was open and of course when checking the bridge rectifier area I wound two shorted diodes there.

how  to fix makita charger

I checked the surrounding area and found that only these two diodes were shorted and needed replacement. I replaced all four diodes in that area and also checked the main capacitor.

It was ok but I did some cleaning of this white silicon holding the capacitor because once that material get dry it will become conductive.

shorted diodes in battery charger

fixing makita battery charger

After replacing the four diodes and connected the charger through a current limiter, the green light on that charger started to flash on and off and that is a good indication of a working charger.

how to fix and repair makita battery charger

I powered on the charger again; this time I added a battery and as you can see in the photo, the light changed from flashing green to steady red light and according to the specification the battery is being charged at this time.

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 repair articles in the link below:




  1. Yogesh Panchal

    March 4, 2021 at 4:23 pm

    Well done ! Waleed

    • Waleed Rishmawi

      March 5, 2021 at 8:11 pm

      thanks man. have a blessed day

  2. Parasuraman S

    March 4, 2021 at 5:32 pm

    Good and easy work for you! Many thanks for sharing!

    • Waleed Rishmawi

      March 5, 2021 at 8:13 pm

      Parasuraman: yes it was easy and fun to do. I had a lot of this kind of repairs this past month and I was so busy fixing all kind of stuff and hardly had time to write articles but finally I managed. have a good day


    March 4, 2021 at 8:36 pm

    Many thanks for sharing!

  4. Albert van Bemmelen

    March 4, 2021 at 9:32 pm

    Thanks for sharing this Makita charger repair. When the Makita battery packs however go dead they sadly are not so easy to repair. Because not only the cells need to be replaced but in most cases also the battery board in the battery pack that contains a chip that kept track of the condition of the often gone bad cells. And luckily often new boards for original Makita battery packs are sold for affordable prices on Aliexpress. And they also have a safety temperature sensor included. Which is in the original pack often glued to the cells why a new sensor is needed.

    • Waleed Rishmawi

      March 5, 2021 at 8:15 pm

      Albert: you are most welcome. Yes batteries are hard and expensive to fix that is way I do not bother with them. I bought a new drill, charger and two batteries for really cheap and I was surprised of their quality. they are becoming cheaper every day so why bother. have a blessed day

  5. Babu M S

    March 4, 2021 at 10:39 pm

    Very good job.Thanks for sharing

    • Waleed Rishmawi

      March 5, 2021 at 8:16 pm

      Babu: you are most welcome. have a blessed day

  6. Babu M S

    March 4, 2021 at 10:48 pm

    Good job. Thanks for sharing

  7. Lynn Blakely

    March 7, 2021 at 12:36 am

    Good job Waleed: I have a 5 piece Makita tool kit $500.00 dollars worth. They are high quality tools and are very power full at 18volts. Charger is quite large and even has a fan in it. Disclaimer I do not sell tools.

  8. Peter Bellinger

    March 31, 2021 at 6:24 pm

    what was the numder on the replacment diode


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