Attempting to resolve issues with your UniFi USW 48 power supply.
Attempting to resolve issues with your UniFi USW 48 power supply.
I received the USW 48 switch and it performed well at first. Upon closer check, I discovered the 68uf 400W capacitor in the power circuit is swollen, which likely caused the fuse and resistors r20 to r24 to fail. I can locate the capacitor or fuse easily, but the resistors are completely burned out and I don’t know their values. I’m looking for someone who can assist in identifying the correct replacement parts.
As long as you understand what you're doing, it's okay. If you're unsure about your skills—whether you realize you know or don't know—avoid opening a PSU. Don't fake expertise either. When you're confident, you likely have background in electrical engineering classes or working as an electronics assembler, etc. Good luck... I'm not sure where this information comes from or if it's even available. You might want to check out https://forum.level1techs.com/ since the community there can provide detailed help and even decode resistor codes. People there are likely more knowledgeable, which gives you clearer guidance for this technical topic. Lawrence Systems forums could also be useful, as many users run Ubiquity equipment.
Thanks for sharing your background. You have an information electronics degree, which is great. The components you're dealing with seem damaged beyond repair, making readings impossible and causing readability issues. It's smart to reach out for help—someone familiar with similar switches might be able to assist. Don't hesitate to ask around or check forums for comparable experiences. You're not alone in this!
Just because the capacitor was swollen doesn't necessarily mean it was the reason—it might signal a more serious issue. I've swapped out several capacitors on routers and similar devices without any concerns, but with PSUs I'm much more cautious. Although it seems you have a higher chance of grasping the circuit than I do, that's fair. Still, I don't believe it's worth jeopardizing the switch (if it isn't already) to fix it.
We uncovered exactly what happened during the previous mess a few months back... It’s important to do your own investigation and dive into your own projects. I’m not urging everyone to open their own PSUs and swap parts without thinking. But it’s not that difficult or complicated as the situation seems. There are many skilled individuals out there.
I bought a used item from eBay, but it’s on the opposite side of the world, so shipping could mean I end up getting a replacement.