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.
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.
Do you see the fault? I think it is a little hard to see it from this top view side.
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.
These are the capacitor ratings and I am sure that I can find a replacement in my shop.
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,
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: