Hi, I have just dismantled a US Robotics 24-port switch (997924) that had completely died. The unit has a 3.3V 6A SMPSU boad made by Achme Corp and there were two bulging Teapo caps (1000uF and 2200uF at 10V) on the output side. I replaced these and the unit worked for about 30 mins and then died again - not even a whistle this time. There is also a Teapo HV electrolytic which I have not replaced yet (all I have done is a basic low voltage check with an ohmmeter for an open/short) but any other suggestions are welcome - I guess something else has been stressed by the faulty caps or one of the new ones has failed early?
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Last edited by linker3000; 09-11-2007, 06:24 PM. -
Re: Bad caps in US Robotics 24-port switch
Did you just replace the caps that looked bulged? Teapo are notorious for failing without physical signs, so it's possible that other caps on the board have failed. Replacing the bulging caps would have sorted your problem temporarily, but these new caps would get stressed by the already failed caps and the unit would die again.
If you have an ESR meter, check all the other Teapo caps for ESR. If not, it's probably best to replace all the caps that have a visible vent pattern on the top - even if they're not bulging.You know there's something wrong when you open your PC and it has vented Rubycons...
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I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.
For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).
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It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:
https://www.badcaps.net/filedata/fetch?id=359177... -
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