More failed Jamicon 12,000u 80v

[Gtr_tech]

Poooof....here we go again. More import pwr amps with these Jamicon 12,000u 80v snap ins gone supernova. Codes are 418K0 and 445K0. Not quite sure what to do about this other than advising replacement (with better parts) even when no visable signs of failure are evident. 2 more amps become scrap this week because of this (holes charred in the pcb at the point of vent).

[J M Fahey]

Hi GtrTech. What was the power supply voltage they had to stand?
I don't get very well the "hole burned thrugh the board" image.
I would expect leaks or, in a heavy overload, can bursting, showering everything with nasty corrosive salts and wet "paper"/aluminum foil bits everywhere.
Thanks.

[Rhodesplyr]

Poooof....here we go again. More import pwr amps with these Jamicon 12,000u 80v snap ins gone supernova. Codes are 418K0 and 445K0. Not quite sure what to do about this other than advising replacement (with better parts) even when no visable signs of failure are evident. 2 more amps become scrap this week because of this (holes charred in the pcb at the point of vent).

That name rings a bell.

I started having weird problems with my Musical Fidelity A324 DAC, and after taking out the security screws that held the cover on, I found that the problems were caused by failed electrolytic caps, including almost complete shorts at the outputs.

Manufacturer: Jamicon

I've read of other MF equipment owners having similar reliability problems connected to this capacitor brand.

[Robert8192]

For my first post...

I say BAN JAMICON CAPS!!

[Gtr_tech]

Hi GtrTech. What was the power supply voltage they had to stand?
I don't get very well the "hole burned thrugh the board" image.
I would expect leaks or, in a heavy overload, can bursting, showering everything with nasty corrosive salts and wet "paper"/aluminum foil bits everywhere.
Thanks.

I'll post pix of the damage tomorrow. Its no joke.....

[tedmich]

another incident of... The Capacitor Plague!

See Capacitor plague - Wikipedia, the free encyclopedia

supposedly a whole bunch of Taiwanese manufacturers used a stolen electrolyte formula which lacked a corrosion inhibitor leading to H2 gas and explosions. Should be all clear after ~2001 but maybe they sold their stock to music electronics mfg. as the typical amp gets used <1/10 the typical motherboard...