Leaked electrolytic capacitor 6.3v 3300uf on a computer motherboard.
An electrolytic capacitor is a polarized capacitor whose anode or positive plate is made of a metal that forms an insulating oxide layer through anodization. This oxide layer acts as the dielectric of the capacitor. Sometimes the electrolyte leak out of themselves, and you may see this brown crust around the capacitor, or perhaps on it. It often looks somewhat like a dried coffee stain.
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