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Old 3rd January 2010, 07:06 PM   #1
Robcrx is offline Robcrx  Canada
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Question What do leaky caps look like ?

Im in no way a tech guy, just curious. I found this pic online.
Are these caps starting to leak ?

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Old 3rd January 2010, 07:34 PM   #2
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No, the caps are manufactured with these marks.
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Old 3rd January 2010, 07:51 PM   #3
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Quote:
Originally Posted by Robcrx View Post
Are these caps starting to leak ?
With that type of can style capacitor you'll need to look near the base, where the cap is in contact with the PCB to see if they are leaking electrolyte.

Look for what could well be dried liquid or any form of liquid spill, if you can't see any you should be ok. This doesn't mean that the capacitors are still functioning as they should, just that they haven't "leaked" electrolyte The capacitance value could still be a country mile out due to age & heat.
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Old 3rd January 2010, 07:55 PM   #4
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These photos show a (defective) vented capacitor (on the right) and one that's intact.
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File Type: jpg ttventedcapacitors04.jpg (73.2 KB, 117 views)
File Type: jpg ttventedcapacitors03.jpg (66.7 KB, 114 views)
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Old 3rd January 2010, 11:46 PM   #5
Robcrx is offline Robcrx  Canada
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cool.
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Old 4th January 2010, 12:44 AM   #6
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One more. These are leaking from the bottom seal. There are two things that you need to look for. The brown liquid around the perimeter of the capacitor is where the electrolyte is highly concentrated. If you look out a bit farther, you can see that it looks like an oil has spilled on the board. It's more obvious on boards that are dusty but can be seen on clean boards if you look closely.

As a side note...
Anyone with an amp (Autotek, Hifonics...) that uses these brown Nichicon capacitors marked PF(M) should check for this to see if there is any leakage. The electrolyte can damage large areas of the board.
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Old 4th January 2010, 01:00 AM   #7
Robcrx is offline Robcrx  Canada
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Ok cool.
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Old 4th January 2010, 01:01 AM   #8
poynton is offline poynton  United Kingdom
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[QUOTE=Perry Babin;2034011].................These are leaking from the bottom seal. There are two things that you need to look for. The brown liquid around the perimeter of the capacitor is where the electrolyte is highly concentrated. ...........QUOTE]

Some manufacturers fix large caps down with with glue/cement. This can be brown or white. but usually goes up the can a little. Don't confuse with leakage.


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Old 4th January 2010, 03:17 AM   #9
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if there's a leakage, what's the best way to clean the PCB?
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Old 4th January 2010, 03:20 AM   #10
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