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A Drill Battery Charger Shorted Out, Maintained And Repaired

By on January 8, 2021
drill battery charger repair









A guy walked into my shop and asked me to start fixing stuff for him. He just opened a new shop in town that deals with electrical repairs and wanted to expand it into electronic repair and that is where I come in as technician.

bosch drill battery repair

He brought two of these drill battery chargers and both were totally dead. When I powered on one of the devices, there was no indication of any life sign left in.

Today I am sharing with you guys the repair of one charger because both were having the same symptoms and the same repair was done to both chargers so let us begin.

burnt fuse modify

That is the first thing I saw when I took the back cover off and that was not a pleasant sight. The size of that fuse wire that was added to the device scared me a lot and I was expecting the worse with this device.

burnt circuit track

Upon more inspection, I saw this repair done to the board and as you can see someone tried to get it fixed yet that technician did not deal with the cold soldering joints that are very obvious on that board.

shorted diodes

Since the main fuse was repaired with a thick wire, the most logical thing to do is to check the diodes in the primary section of the power supply.

All three were shorted out but as always I replaced all four of these diodes.

bad coponents in drill battery charger

I also found the Mosfet in this charger shorted out and had to be replaced.

shorted fet

All these parts were replaced but before I power the charger on, remember that damaged area? I went over it and get that area organized and ready to receive power.

broken circuit track

how to fix a broken drill battery charger

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. Mark

    January 8, 2021 at 6:31 pm

    Hey Waleed,
    It amazes me what some people do to try and repair components.
    In my automotive field, I have seen people replace fuses with fencing wire and even bullets!
    Thanks for the article

    • Waleed Rishmawi

      January 9, 2021 at 4:03 pm

      Mark: some people are so crazy when they replace the intended fuse with something higher or something bad. they are actually killing their device not repairing it and I problem i think they are trying to save some money by doing that but in the process they are not saving money but paying more for repair. have a good day

  2. Joseph Gomez

    January 8, 2021 at 7:33 pm

    Dear Waleed,
    Congrats for a well done repair. It is surprising how many electrical and electronic devices fail completely due to such "simple" faults.

    • Waleed Rishmawi

      January 9, 2021 at 4:04 pm

      Joseph: thanks man. yes they done and sometimes to some customers who are trying to save money by adding wrong component instead of the intended ones. have a good day

  3. Albert van Bemmelen

    January 8, 2021 at 8:23 pm

    There are many repairs that involve replacing bad mosfets, but none you wouldn't know how to handle. And having also most parts in store is of course even better!

    • Waleed Rishmawi

      January 9, 2021 at 4:05 pm

      Albert: yes very true. I try to keep all these parts on stock so when needed it will be replaced and repaired fast and that is what the customer is asking for. have a good day

  4. Parasuraman S

    January 9, 2021 at 12:07 am

    Hi! Dear Friend! Another life saving work and success, as always comes to people like you, as you close all other escape routes for it to go!

  5. Waleed Rishmawi

    January 9, 2021 at 4:07 pm

    Parasuraman: hi dear friend. thank you and have a blessed day

  6. Yogesh Panchal

    January 9, 2021 at 5:50 pm

    Well Done! Waleed
    Person Might have thought of Life time solution by putting that wire on fuse.... Ha ha ha.............

    • Waleed Rishmawi

      January 12, 2021 at 6:17 pm

      Yogesh: thanks man. yea there are some crazy technicians out there. Lord have mercy. have a good day


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