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Electric Scooter Repair: Step-by-Step Guide to Replacing Blown Controller MOSFETs

Repairing an electric scooter often entails dealing with its electronic components when things go awry. Among these, the MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) in the controller are crucial for its efficient operation, as they regulate the motor's power. If your electric scooter has been acting up, and you've diagnosed that the issue lies with blown MOSFETs, replacing them can restore your scooter's performance. Here's a step-by-step guide to help you through the replacement process safely and effectively.

Preparing for the Repair

  • Safety First: Before beginning the repair, ensure the scooter is powered off and the battery is disconnected.

  • Gather Your Tools: You will need a soldering iron, solder, a Phillips screwdriver, and replacement MOSFETs that match your controller's specifications.

Accessing the Controller

  1. Locate and remove the screws securing the controller compartment.

  2. Carefully open the compartment to expose the controller board.

Removing Blown MOSFETs

  1. Identify the blown MOSFETs by looking for visible damage or using a multimeter to test continuity.

  2. Use the soldering iron to heat the solder around the connections and gently remove the faulty MOSFETs.

Installing New MOSFETs

  1. Apply fresh solder to the connection points on the board.

  2. Align the new MOSFETs with the correct orientation and carefully solder them into place.

  3. Ensure all connections are solid and that there's no risk of short circuits.

Final Steps

  1. Reassemble the controller housing and secure it back on the scooter.

  2. Reconnect the battery and test the scooter for functionality.


Replacing blown MOSFETs on an electric scooter controller requires patience and precision, but it's a manageable task for those comfortable with DIY electronics repairs. If you encounter any difficulties or are unsure about the process, consult a professional for assistance. By following these steps, you can save the expense of a new controller and get back to riding your scooter with confidence.

Please note: This guide assumes a familiarity with basic electronics and soldering. If you are not confident in your ability to execute these repairs safely and correctly, it is recommended to seek professional help.

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