Overheated Sanyo Capacitor In TiViBox Power Supply




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Lost_1N_Space: diablotek da series 500-watt I need ur help on ntc 5d-13 or ntc 8d-13  need ur help ?

Jared Smith: Sanyo sold out their electrolytic division to Suncon some years ago... unless that is a really ancient PSU (it is an ancient design) then I highly doubt those are genuine Sanyo caps. There are also a couple other giveaways... notice how the sleeves seem to cover a bit more of the top vent area than most electrolytics... that is an indication of a resleeving job, very common amongst cheap chinese fakes. Another clue is that the capacitors are green/gold. IIRC if these were genuine they would be  ultra low impedance/high ripple rated motherboard grade caps (used to be good years ago, not good enough for todays boards though). The thing is if you use such a series of capacitor on a switching power supply like that the one in the video the ESR of a motherboard grade cap is so low that it throws the loop compensation off of the power supplies pulse width modulation feedback circuit. In other words using a high grade cap on a computer power supply can actually make things worse.

Phenom69ll: Hey..

What's the general "safe temperature" range for a capacitor?

Thanks.

MrMac5150: I noticed there are no reply tabs to click on to comment to one individual post but I guess you just make a new post, do not understand the new google Youtube.

MrMac5150: It is a good idea to go threw all the caps with a ESR Meter because you can not tell just  by looks, you could have had one that just had a little gas in it but was still good, we have seen some large caps thinking they are bad, but it was just the plastic cap on the capacitor, they all dry out after 15 years in warm conditions.

Laharl Krichevskoy: Maybe you didnt see any symptoms because the mother board is good. I had one psu with a overheated cap, although this one was a cheapy-medium one and it surely overheated because of the current as it had nothing around. The thing is i changed the psu for a bigger one at that moment and then never used it again, but years later trying some stuff i plugged it to my oscilloscope just out of curiosity to take a look and notices 1Vpp of noise! I said "well maybe it's because it has no load", so i attached 10W to the 5V and a variable one (up to 180W) to the 12V rail and with 5A of load the ripple went to the roof hitting 2,4Vpp. Long story short, bad cap + crapty psu = potential motherboard killer. I suppose my old P4's intel board didnt die because it had some caps on the board that compensated for the supply's (a 1000µf one on the end reduced it to 250Vpp) but it scared the crap out of me when i saw those number, it could have died had i not changed it >_< Now whenever i see a pc with a cheap psu i start to feel the adrenaline XD
It would be interesting to know how many of those "mysterious deaths" that mostly cheap motherboard have are related to these kind of failures.
Can you check your psu's noise with the old cap?
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Overheated Sanyo capacitor in TiViBox Power Supply