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A Drill Battery Charger Was Powering On But  Does Not Charge Repaired

By on November 17, 2020
A Drill Battery Charger Was Powering On But  Does Not Charge Repaired








A young man showed up to the workshop and brought a drill battery charger. The charger was already opened and the customer brought only the board. I am not sure what the brand name or the model number of the charger but I think it was Makita charger.

makita charger repair

From what I saw on that board, there were a lot of cold joints that needed attention but I do not think it was the main reason why the charger comes on and does not charge.

Re soldering these joints were done but problem remained.

how to repair makita charger

Do you see the fault? I think it is a little hard to see it from this top view side.

how to fix and repair makita battery charger

I am sure you can see it now. The main capacitor was a little bit bulgy and had to be replaced.

When I checked the voltage reading there, it was only 200 DC volts and that is low. We should get at least 300 DC volt there.

bad filter capacitor

These are the capacitor ratings and I am sure that I can find a replacement in my shop.

pcb of bad filter capacitor

When I took the capacitor off board, there was a lot of silicon beneath and that has to be cleaned. This stuff becomes conductive once its color started to change due to heat so I usually clean that before installing any new capacitor there.

I powered on the device and it was charging just fine but I have to say sorry because I did not take any photos beyond this point. Everything was done in a hurry and I forgot totally about it.

Anyway, the customer came and got his charger and was happy with the result and to that I could say,

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. Albert van Bemmelen

    November 17, 2020 at 8:47 pm

    Strange that of the 1.414 x 234 AC voltage only 200V remained. (Max DC voltage after rectification over the capacitor should be around 330.8 VDC. In my home I measured 234VAC on my power lines). I guess it overheated the capacitor after it deteriorated.

    • Waleed Rishmawi

      November 18, 2020 at 4:53 pm

      Albert: yes very strange but but sometimes that what we get. the point it got fixed and customer happy. lol. have a good blessed day

  2. babums

    November 17, 2020 at 11:02 pm

    It is under stood now the capacitor can create such a problem. Thank you very much sir for sharing.

    • Waleed Rishmawi

      November 18, 2020 at 4:54 pm

      babums: yes capacitors can create a lot of problems in such devices. you are most welcome. have a blessed day

  3. Tanabalan

    November 18, 2020 at 1:40 am

    That was a very good work.I like to know one thing. Was it easy to replace the smd ic.

    • Waleed Rishmawi

      November 18, 2020 at 4:57 pm

      Tanabalan: thanks . what SMD IC? I did not change any of that. usually if SMD ic involved it is very easy to replace with heat station and flux. have a good day

  4. Parasuraman S

    November 18, 2020 at 11:22 am

    Very good professional fix! Many thanks for sharing!

    • Waleed Rishmawi

      November 18, 2020 at 4:57 pm

      Parasuraman: thanks man. have a blessed day

  5. Yogesh Panchal

    November 21, 2020 at 9:44 pm

    well done! Waleed


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