Just fixed a really nice FIC MicroATX board with ATI chipset (was bad crystal). There is a mix of caps - they probably used all good brands - Nichicon, Rubycon, Sanyo, Panasonic and UCC. The only thing that worries me are the Nichicon HM(M) caps with H0335 datecode. Does anyone know if they're affected or not? They seem OK as the board was probably not used at all, just laying somewhere.
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Re: Which Nichicon HM(M) and HN(M) date codes are affected?
Bumping this old thread
Saw some industrial systems at work now
We looked at two machines, and just assumed that since those had bloated caps the older one must have too
Well popped the lid on it now but it's Nichicon HM(M) caps where just fine, datecode 0213
Was it only one line or shift of several at Nichicon that produced the overfilled caps?
Is there any known date range that is confirmed by Nichicon for the problems?"The one who says it cannot be done should never interrupt the one who is doing it." -
Re: Which Nichicon HM(M) and HN(M) date codes are affected?
There's a thread for collecting bad date codes on these:
https://www.badcaps.net/forum/showthread.php?t=4654Comment
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Hello All, I have on the bench a couple of PSU's which have some failed Nichicon PL series caps. They didn't "puke" their guts through the top, but instead "diarrhea'ed" corrosive brown electrolyte through the bottom, down the legs and onto the board. On one cap, the electrolyte rotted the cap right off the board leaving 2 little stubs, and also corroded a trace on the foil side.
The PSU's are Power-One MAP series and are ringing-choke topology. The semiconductors have date codes in 1993. The PSU's were used in a commercial application, fan-cooled. They had failed... -
I recently acquired a set of Bose Roomate speakers from the mid to late 80's. Basically the right speaker cabinet is completely passive, and the left one has the power transformer and amplifier circuit in it. Out of curiosity, I opened it up to see what the circuit looked like. Looks like they used all Nichicon VX (2x 4700uF/16v for smoothing off the bridge rectifier), a couple random Nichicon SE series sprinkled on the board, and what really caught my eye - 2 yellow sleeved Nichicon caps (both 1uF/50v with no real series marking. Below are pictures of the caps. The only thing not shown in these... -
I have a cheap action camera with an annoying trait, every time I change batteries the date & time gets reset and I have to set it again.
To solve this problem I want to add a small internal battery inside it which will keep supplying power to the camera for a while while I change batteries so the date & time is retained.
I have opened the camera and I think there is enough room to add something inside to accomplish this:
The camera is powered by a 3.7V nominal single cell lithium ion battery.
So I need to connect another battery in... -
Just archiving everything related to bumpgate since most stuff has disappeared from Google. Maybe people will finally take the time to read some of it and stop shouting "reflow gpu" at every occasion but rather try to understand what the real issue is…
Interesting parts about the failure analysis are "Why Nvidia's chips are defective" and "Why Nvidia's duff chips are due to shoddy engineering"
May complete this post at a later date with more details.
Basically issue is a combination of thermal dissipation of the chip with hotspot,... -
I want to calculate capacitor ESR referring to below guide.
https://forum.digikey.com/t/calculat...-from-tan/2633
I must find out dissipation factor(Tan(δ)) for nichicon lxj series(6.3v 1500uf,25v 1000uf ,10v 2200uf)
I finally found out datasheet which has all series of nichicon capacitor.But unfortunately, It removed old nichicon capacitor.
Is there anyone who still has old nichicon datasheet which has information of LXJ series?
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