Hello,
So I have this roughly 10 year old PC power supply that won't power on. When I disconnected all of the cables, then shorted the green cable to ground, the power LED on the power supply went on for about half a second then nothing.
So I took it apart and one of the surface mount caps had this brownish residue around the edges of the solder joint. So I have a couple of questions:
1) Do surface mount caps have gel like material in them as electrolytic caps have? If not, what is that residue that seems to have come out of the cap? It scraped off like a crusty brownish residue like burnt brown sugar ... kinda...
2) The cap has no print on it of any kind. It is a light purple color. Does the color somehow determine the value? There is another cap right next to it thats identical. I assume if I remove it and measure its value, I could replace the one that seems to be bad with that same value???
3) Since I don't have any surface mount caps laying around, I'm going to try and find one from another circuit board that is no longer in use ... if I find a value that is higher than the one being replaced, is it reasonable to think that it should be fine in the long run? And am I right in thinking that a lower value would NOT be recommended?
Thank you,
Mike Sims
So I have this roughly 10 year old PC power supply that won't power on. When I disconnected all of the cables, then shorted the green cable to ground, the power LED on the power supply went on for about half a second then nothing.
So I took it apart and one of the surface mount caps had this brownish residue around the edges of the solder joint. So I have a couple of questions:
1) Do surface mount caps have gel like material in them as electrolytic caps have? If not, what is that residue that seems to have come out of the cap? It scraped off like a crusty brownish residue like burnt brown sugar ... kinda...
2) The cap has no print on it of any kind. It is a light purple color. Does the color somehow determine the value? There is another cap right next to it thats identical. I assume if I remove it and measure its value, I could replace the one that seems to be bad with that same value???
3) Since I don't have any surface mount caps laying around, I'm going to try and find one from another circuit board that is no longer in use ... if I find a value that is higher than the one being replaced, is it reasonable to think that it should be fine in the long run? And am I right in thinking that a lower value would NOT be recommended?
Thank you,
Mike Sims
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