Bulging Top Capacitor

I ordered one but im just wondering what your thoughts are. In such case the pressure inside finds its way through the bottom.

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Capacitor c110 is bulging at the top which means the electrolyte is trying to burst out of the vent.

Bulging top capacitor. A bad capacitor or one that is starting to bulge will start to swell at the top no longer looking indented. Others swell to the point of blowing thus you can see electrolyte brown crud on the. This can be accompanied by a tiny deposit of dried electrolyte in the middle of the top.

The can is kind of hermetically sealed but. Do bad capacitors always have to have a bulge on the top as mine doesnt seem to have that. It often looks somewhat like a dried coffee stain.

The overheated dried and crystallized electrolyte will also try to force its way out the bottom. The bottom of an electrolytic capacitor is covered by a rubber. It pushes against the rubber seal on the bottom and lifts the capacitor case off the board.

Then you may see this brown crust around the capacitor or perhaps on it. In this image i have tried to photograph the slight bulge on the top of this bad capacitor. Probably a good idea to make sure its discharged first but once its been damaged to the state that it is bulging it probably doesnt store much energy any more.

The electrolyte discharge can also be larger covering the top of the cap with a dried substance which can be black orange brown white or a similar colour. So a capacitor which has failed can show bulging at the top. Well apparently more than double their capacity.

The gas inside pushes this rubber out making the bottom bulging and also lifting its case above its circuit board. Sometimes during the capacitor failure the top vent does not break. Been there done that.

The vent is stamped into the top of the casing of a can shaped capacitor forming a seam that is meant to split to relieve pressure build up inside preventing an explosion broken or cracked vent often accompanied with visible crusty rust like brown or red dried electrolyte deposits. Electrolytic capacitors are can shaped components that store and filter electric charges in many kinds of electronic devices. A good cap will have a very flat top.

Bulging bottom lifted case. It is easier to see in person than in my picture. Any bulge is a bad sign.

Bulging of the vent on top of the capacitor. If you open a computers case and see capacitors with their sides and top bulging these components have failed. Excess voltage in the circuits can make chemical compounds in the capacitors.

I removed the capacitor i dont have a test meter but there is no bulge on the top to indicate a bad capacitor but i suspect thats the problem. Ok so basically they become so unpredictable while it may have appeared to have doubled in capacity they certainly have lost their voltage.

Edn It S Always A Capacitor Paul Rako

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