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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.
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Identify the four screws (two at the back, two at the bottom) holding the switch closed. One is hidden behind a sticker.
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You do not need to remove the rack brackets
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Use a PZ2 screwdriver to remove the screws
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Slide the lid a short distance towards the front to open the switch.
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Identify the power supply. It is the yellow separate board at the bottom.
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There may be burn marks on the power supply from the failure.
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Remove it from the switch (4 screws, PZ2)
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Save the power supply and screws. You will need them later.
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Unbox the replacement Powersupply
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Unscrew the two screws at the front, and the two at the back to remove the top metal screen
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Finally removed the two back screws to free the board from the bottom metal screen
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Insert the replacement Powersupply in the switch, and secure it with the original 4 screws
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Dimensions of the replacement power supply should be identical to the original one.
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The main power connector should fit on the new power supply.
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Unsolder the 24v leads from the old power supply.
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Identify the positive and negative output on the new power supply. On this one, positive is at the bottom of the picture.
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Solder in the 24v leads on the new power supply
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Solder in the blue (+) lead on the bottom of the output connector
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Solder in the black (-) lead on the top of the output connector
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Alternatively, get a proper connector that fits on the power supply.
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Finally, connect the 24V on the main board
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To reassemble your device, close the lid and secure the four screws.
To reassemble your device, close the lid and secure the four screws.
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