How to Re Fuse a Power Supply: 10 Easy Steps (2024)

Table of Contents
Unplug the Power Supply. Open and Unplug the PSU. Unscrew the Power Supply. Check the Warranty. Examine the Fuse. Charge the Soldering Iron. Solder New Pins to the New Fuse. Trim the Wires and Circuit Board Pins. Solder the New Fuse. Reinstall the PSU. Community Q&A Tips Warnings Things You'll Need About This Article Did this article help you?

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IN THIS ARTICLE

1Unplug the Power Supply.

2Open and Unplug the PSU.

3Unscrew the Power Supply.

4Check the Warranty.

5Examine the Fuse.

6Charge the Soldering Iron.

7Solder New Pins to the New Fuse.

8Trim the Wires and Circuit Board Pins.

9Solder the New Fuse.

10Reinstall the PSU.

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Tips and Warnings

Things You'll Need

Related Articles

Expert Interview

References

Co-authored byRichard Taylor

Last Updated: January 31, 2024

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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.

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2

Open and Unplug the PSU.

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  1. Use a screwdriver to remove the screws of the PSU . 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.

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  1. Generally, the power supply is held in place by 4 torx screws. Unscrew them using the torx screwdriver and remove the power supply from the PSU.[3]

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4

Check the Warranty.

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  1. The warranty is a stamped sticker that is on one of the edges of the power supply. 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.

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  1. The fuse is usually located on one corner of the power supply. 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]

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6

Charge the Soldering Iron.

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  1. Plug in the soldering iron and heat it to about 700 degrees. 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.

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  1. Buff each end of the fuse with emery paper to dull the plating. 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]

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Trim the Wires and Circuit Board Pins.

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  1. Use the wire cutter to remove any excess pins from the board. Also, cut the gauge wire with only an inch of space from the fuse joint.[8]

9

Solder the New Fuse.

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  1. Place the new fuse onto the circuit board and solder it into place with the soldering iron. Once this has been completed, use the ohmmeter to test the fuse.

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10

Reinstall the PSU.

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  1. Once the fuse is showing good readings on the ohmmeter, close the power supply case. Keep it back into the PSU and screw it in. Replace the PSU casing and plug it in for use.

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  • Question

    If you use a fuse that different from fuse that I remove, will it be able to function?

    How to Re Fuse a Power Supply: 10 Easy Steps (23)

    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.

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      Tips

      • While removing the power supply case, support it using one hand otherwise it will fall onto the motherboard.

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      How to Re Fuse a Power Supply: 10 Easy Steps (24)

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      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.

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      Things You'll Need

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

      About This Article

      How to Re Fuse a Power Supply: 10 Easy Steps (25)

      Co-authored by:

      Richard Taylor

      Electrician

      This article was co-authored by Richard Taylor. Richard Taylor is an Electrician and Owner of R H Taylor Electrical Services based in Vero Beach, Florida. Richard has over 35 years of professional experience. He and his team offer electrical installation, re-wiring, and repair services. This article has been viewed 92,324 times.

      37 votes - 75%

      Co-authors: 9

      Updated: January 31, 2024

      Views:92,324

      Categories: Electrical Wiring and Safety Switches

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      • Send fan mail to authors

      Thanks to all authors for creating a page that has been read 92,324 times.

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      How to Re Fuse a Power Supply: 10 Easy Steps (2024)
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