Reply 20 of 69, by PCBONEZ
As I recall I'm the one that taught you the finer points of capacitors 10-15 years ago over at BCN.
Are you still using that same old soldering iron?
The small 5mm or less and 220uF or less wet-lytics caps do fail too but they have different jobs and see a lot less stress so they don't fail very often.
(Notable exceptions are boards using OST (brand) and early Intel made P4 boards that used 85°C Nichicons for the small caps. Both of those fail often and can fail en masse.)
Asus liked to use 4mm G-Luxon caps in their audio circuits on some old boards. These should be replaced. They do fail and audio stops working.
Yup. There are 100's of special cases. I don't even try to list all of them anymore.
The brand doesn't matter much. I've heard of no brand that has issues with their polymers.**
Not all polymer caps are alike. The quality of the polymer varies widely from brand to brand... I *think* Taiwanese polymers are ok (Apaq, Capxon, Lelon) but I wouldn't completely trust anything other than Japanese polymers. Chinese polymers should be avoided at all cost. A _good_ polymer cap has a moist, intact polymer layer inside, even after many years. A poor quality polymer cap will be crusty after a short time.
I don't know about that. Seems to me that functional polymer should be moist and solid polymer dry.
What I do know is I haven't seen any mass failures of any brand....
... Yet. Some brands are new to poly so time will tell.
[** Not counting early Fujitsu Functional Polymers (now Nichicon "FP Caps"). Those are not solid, but rather a hybrid between wet-lytic and solid polymer. The problems were only with some of the very early black-yellow versions made before about 2001. The later ones (even the later Black/Yellow) are fine.]
I know that this is the consensus, but it is inaccurate. Even the later yellow/black ones do not age well. They should be replaced on sight, regardless of their manufacturing date.
I bought and used some when KC8 was selling. I haven't had a single problem with them or on any board that's DDR or newer.
It's a shame you guys are letting hardwareinsights die.
It had the makings of a good site but I looked in a few days ago and I saw almost no activity over there in the last year.
With the retro thing spinning up you guys should be getting hot on old type PSU reviews and repair topics.
I was going to email Behemot but he didn't answer the last time I wrote him and that was to buy some of those custom made caps.
I do it when I have to but I don't even like working PSUs. (My thing is mobos.)
If it looked like there was any life over there I'd be sending people with PSU problems over.
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