USP is 4 years old, simptoms were:
- on power loss it would not switch to battery but reported error instead
- sometimes the pwrstat service would turn off the computer on boot, as soon as the service started, UPS told it battery was low and it would issue a shutdown signal
First I thought it was the battery, opened it up and found a bulged cap. It seems it also leaked brown fluid around the case (last picture).
It was Su'scon 4700uF 16V SD series (low ESR), replaced with Yageo SC series 4700uF 16V 16x25mm that I had at home. The big cap is right under the small PCB with fuses.
Now, the other caps are all su'scon SK series - standard, not low esr.
Cap replaced, cleaned interior with alcohol, UPS works fine for a couple of weeks now
Now, should I replace the other caps too?
Here is the list:
5x 22uF 50V 5x10mm
3x 47uF 25V 5x10
1x 100uF 25V ~6x15
2x 1uF 50V ~5x10
I don't know how this crappy brand behaves in UPS, it is 4 years old, but the battery (old one) holds somewhere around 10 min on my machine running linux and powering PC, LCD monitor, ADSL modem and router. It has a console utility, it is a proprietary blob but works fine. Can be scripted easily to send email on power failure and another email on batt low and then shutdown a machine nicely. Enough for me. Have a new battery I got from a friend and if I have to open it again, would probably replace all su'scons.
What do you think, is it worth the effort?
- on power loss it would not switch to battery but reported error instead
- sometimes the pwrstat service would turn off the computer on boot, as soon as the service started, UPS told it battery was low and it would issue a shutdown signal
First I thought it was the battery, opened it up and found a bulged cap. It seems it also leaked brown fluid around the case (last picture).
It was Su'scon 4700uF 16V SD series (low ESR), replaced with Yageo SC series 4700uF 16V 16x25mm that I had at home. The big cap is right under the small PCB with fuses.
Now, the other caps are all su'scon SK series - standard, not low esr.
Cap replaced, cleaned interior with alcohol, UPS works fine for a couple of weeks now
Now, should I replace the other caps too?
Here is the list:
5x 22uF 50V 5x10mm
3x 47uF 25V 5x10
1x 100uF 25V ~6x15
2x 1uF 50V ~5x10
I don't know how this crappy brand behaves in UPS, it is 4 years old, but the battery (old one) holds somewhere around 10 min on my machine running linux and powering PC, LCD monitor, ADSL modem and router. It has a console utility, it is a proprietary blob but works fine. Can be scripted easily to send email on power failure and another email on batt low and then shutdown a machine nicely. Enough for me. Have a new battery I got from a friend and if I have to open it again, would probably replace all su'scons.
What do you think, is it worth the effort?
Attached Files
Half of the computer problems is caused by bad contacts 
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