recently, i tested some panny fj caps that i pulled from an asus a8v board some years back. these caps are 820 µf 6.3v rated and they all tested low capacitance with a reading of around 550 µf with a vloss of 5%. the esr tested normal tho.
these caps were used as general filter caps around the board for the minor rails. none of the caps show any signs of bulging. it should be noted the board was used with a capxon psu which seems to output a ton of ripple making the board unstable and failing to boot after a year of use.
so my question is what happened internally to the panny fj caps to make them low capacitance and high vloss? my assertion is that the excessively high ripple would make the electrolyte evaporate due to internal heating from what i know but none of the caps show any signs of bulging (there are over 20 of them!) so im not sure if my hypothesis is correct. so i guess these fj caps are drying out internally if they exhibit low capacitance and high vloss due to loss of electrolyte? it seems like caps only bulge if heat abused but not if electrically abused. need to know if my understanding of all of the above is correct so i can avoid this type of failure in future and not use junk failing psus and killing my mobos. thanks.
these caps were used as general filter caps around the board for the minor rails. none of the caps show any signs of bulging. it should be noted the board was used with a capxon psu which seems to output a ton of ripple making the board unstable and failing to boot after a year of use.
so my question is what happened internally to the panny fj caps to make them low capacitance and high vloss? my assertion is that the excessively high ripple would make the electrolyte evaporate due to internal heating from what i know but none of the caps show any signs of bulging (there are over 20 of them!) so im not sure if my hypothesis is correct. so i guess these fj caps are drying out internally if they exhibit low capacitance and high vloss due to loss of electrolyte? it seems like caps only bulge if heat abused but not if electrically abused. need to know if my understanding of all of the above is correct so i can avoid this type of failure in future and not use junk failing psus and killing my mobos. thanks.
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