How to Re Fuse a Power Supply

PDF download Download Article
PDF download Download Article

When your power supply dies, it can mean that the fuse has been blown. Most fuses are soldered directly to the circuit board. Replacing them is a relatively straightforward process that requires remove the circuit board, unsoldering the old fuse, and soldering a new fuse in its place. Read on for more detail.

1

Unplug the Power Supply.

PDF download Download Article
  1. Unplug the line voltage power cord from the socket. [1]
    2. Advertisement
2

Open and Unplug the PSU.

PDF download Download Article
  1. Remove the PSU casing. Unplug the low voltage cables that are connected to the drives and motherboard. Remove any cards that may obstruct your view of the power supply. [2]
3

Unscrew the Power Supply.

PDF download Download Article
  1. Unscrew them using the torx screwdriver and remove the power supply from the PSU. [3]
    2. Advertisement
4

Check the Warranty.

PDF download Download Article
  1. It consists of the warranty date, a bar code and a ‘pass’ stamp. If the warranty has expired, cut across the sticker safety seal and open the power supply case. [4]
5

Examine the Fuse.

PDF download Download Article
  1. Use an ohm meter to check the fuse. If the ohm meter is showing readings below 0.1 ohms, or if there is resistance on the meter, then you will know that the fuse has blown. [5]
    2. Advertisement
6

Charge the Soldering Iron.

PDF download Download Article
  1. Touch the tip of the soldering iron to the tin wires on either side of the fuse. As the solder softens, gently push the fuse away from the circuit board. Once the soldering is complete, you can remove the fuse. [6]
7

Solder New Pins to the New Fuse.

PDF download Download Article
  1. Take the six inch long stripped 24 gauge wire with flux and tin it with resin solder. Tin the ends of the fuse, after which you can solder the wires to the ends. [7]
    2. Advertisement
8

Trim the Wires and Circuit Board Pins.

PDF download Download Article
  1. Also, cut the gauge wire with only an inch of space from the fuse joint. [8]
9

Solder the New Fuse.

PDF download Download Article
  1. Once this has been completed, use the ohmmeter to test the fuse.
    2. Advertisement
10

Reinstall the PSU.

PDF download Download Article
  1. Keep it back into the PSU and screw it in. Replace the PSU casing and plug it in for use.

Community Q&A

Search
Add New Question
  • Question
    If you use a fuse that different from fuse that I remove, will it be able to function?
    Donagan
    Top Answerer
    It may function all right. However, it's possible the circuit will not work. It's also possible that a fire or other dangerous situation could develop. It's important to use the right fuse.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
    Yes No
    Not Helpful 2 Helpful 13
Ask a Question
200 characters left
Include your email address to get a message when this question is answered.
Submit
      Advertisement

      Video

      Tips

      • While removing the power supply case, support it using one hand otherwise it will fall onto the motherboard.
        Thanks
        Helpful 2 Not Helpful 0
      Submit a Tip
      All tip submissions are carefully reviewed before being published
      Name
      Please provide your name and last initial
      Submit
      Thanks for submitting a tip for review!
      Advertisement

      Warnings

      • You can still get electrocuted while handling the circuit board. To ensure safety, always hold the board at its edges and do not touch the pins.
        Thanks
        Helpful 1 Not Helpful 3
      Advertisement

      Things You'll Need

      • Torx screwdriver
      • Ohmmeter
      • Soldering iron
      • Emery paper
      • 24 gauge wire
      • Resin solder
      • Wire cutter

      You Might Also Like

      Identifying Positive & Negative Wires: Colors & Power Types
      How to
      Test a Fuse With a Multimeter
      How to
      Solder Wires Together
      How to
      Strip Wire with or without a Wire Stripper
      How to
      Test an Outlet with a Multimeter
      How Do 15A and 20A Outlets Differ? What You Should Know
      How to
      Run Electrical Wires through Finished Walls
      How to
      Install a Circuit Breaker
      How to
      Find the Fuse Box or Circuit Breaker Box
      How to
      Gauge Wire
      How to
      Determine Amperage of Circuit Breaker
      How to
      Straighten a Wire
      How to
      Change a Circuit Breaker
      How to
      Wire a GFCI Receptacle
      Advertisement

      Expert Interview

      Thanks for reading our article! If you’d like to learn more about electrical maintenance, check out our in-depth interview with Richard Taylor .

      References

      1. ↑ https://www.pcgamer.com/is-my-computer-power-supply-dead/
      2. ↑ https://www.pcgamer.com/is-my-computer-power-supply-dead/
      3. ↑ https://www.pcworld.com/article/2924378/replace-your-pcs-heart-how-to-install-a-power-supply-in-your-computer.html
      4. ↑ https://www.pcworld.com/article/2924378/replace-your-pcs-heart-how-to-install-a-power-supply-in-your-computer.html
      5. ↑ https://www.techrepublic.com/article/learn-to-re-fuse-a-power-supply/
      6. ↑ https://www.techrepublic.com/article/learn-to-re-fuse-a-power-supply/
      7. ↑ https://www.techrepublic.com/article/learn-to-re-fuse-a-power-supply/
      8. ↑ https://www.techrepublic.com/article/learn-to-re-fuse-a-power-supply/

      About This Article

      Thanks to all authors for creating a page that has been read 99,409 times.

      Did this article help you?

      Advertisement