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Ubiquiti 48 port switch (US 48 G1) power supply replacement

Introduction

A relatively common failure on Ubiquiti switches is a power supply failure. A switch with a power supply failure will fail to turn on if powered on mains power, but will turn on if given 24-25V on the separate 25V port.

This guide shows how to replace the power supply inside the switch with a generic power supply.

Ce dont vous avez besoin

  1. Ubiquiti 48 port switch (US 48 G1) power supply replacement, Open the Switch: étape 1, image 1 de 1

    • Identify the four screws (two at the back, two at the bottom) holding the switch closed. One is hidden behind a sticker.

    • You do not need to remove the rack brackets

    • Use a PZ2 screwdriver to remove the screws

    • Slide the lid a short distance towards the front to open the switch.

    Modifier

  2. Ubiquiti 48 port switch (US 48 G1) power supply replacement, Identify the broken power supply: étape 2, image 1 de 3 Ubiquiti 48 port switch (US 48 G1) power supply replacement, Identify the broken power supply: étape 2, image 2 de 3 Ubiquiti 48 port switch (US 48 G1) power supply replacement, Identify the broken power supply: étape 2, image 3 de 3

    • Identify the power supply. It is the yellow separate board at the bottom.

    • There may be burn marks on the power supply from the failure.

    • Remove it from the switch (4 screws, PZ2)

    • Save the power supply and screws. You will need them later.

    Modifier

  4. Ubiquiti 48 port switch (US 48 G1) power supply replacement, Ready the replacement power supply: étape 3, image 1 de 2 Ubiquiti 48 port switch (US 48 G1) power supply replacement, Ready the replacement power supply: étape 3, image 2 de 2

    • Unbox the replacement Powersupply

    • Unscrew the two screws at the front, and the two at the back to remove the top metal screen

    • Finally removed the two back screws to free the board from the bottom metal screen

    Modifier

  5. Ubiquiti 48 port switch (US 48 G1) power supply replacement, Install new power supply: étape 4, image 1 de 1

    • Insert the replacement Powersupply in the switch, and secure it with the original 4 screws

    • Dimensions of the replacement power supply should be identical to the original one.

    • The main power connector should fit on the new power supply.

    Modifier

  6. Ubiquiti 48 port switch (US 48 G1) power supply replacement, Connect the 24V leads: étape 5, image 1 de 1

    • Unsolder the 24v leads from the old power supply.

    • Identify the positive and negative output on the new power supply. On this one, positive is at the bottom of the picture.

    • Solder in the 24v leads on the new power supply

    • Solder in the blue (+) lead on the bottom of the output connector

    • Solder in the black (-) lead on the top of the output connector

    • Alternatively, get a proper connector that fits on the power supply.

    • Finally, connect the 24V on the main board

    Modifier
Conclusion

To reassemble your device, close the lid and secure the four screws.

Une autre personne a terminé cette réparation.

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Pehr Söderman

Membre depuis le 07/12/18

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