Oops, capacitor catastrophic failure
8 Aug 2022 23:52:00 UTC
Topic 227948
(moderation:
I didn't know solid caps could break. This one shorted the 12V line, unfortunately I have a 2.5kW supply, so the tracks got damaged somewhat, it melted the solder, and ejected itself from the board. Smelt of TCP (a disinfectant), presumably from the evaporated paint?
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WOW!!! I think that board is
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WOW!!! I think that board is good for parts only from now on unless you send it to China
Was it squealing before it popped? I have an older 1080Ti that squeals as it crunches sometimes and I'm afraid the same thing is going to happen!!
No idea what squealing means
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No idea what squealing means for a card. I wasn't in the room when it exploded, you'll have to ask my parrots. It might just be the cap (£0.24) that needs replacing. And some TLC for the tracks around it. But yeah otherwise I'm gonna start keeping these busted ones as they all fail in different ways. I can sell them for £30 on Ebay, but after postage and fees I only get £20.
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Lovely with the acids and
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Lovely with the acids and alkalis start eating the traces and all the solder joints. Total corrosion mess. That board is toast. Yes, they explode. Like a firecracker. They are supposed to vent long before they go bang, but frequently the vents clog. They boil inside and finally explode like a pressure cooker with a clogged vent. BOOM!
https://en.wikipedia.org/wiki/Capacitor_plague
If you do try and save it, futile, realize all the caps are likely bad and all need to be replaced.
But these are solid ones
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But these are solid ones without a vent. I'm aware of the plague. I replaced caps on 200 motherboards back then at my work. After getting the boards replaced under warranty first [titter]. And those type still do that, presumably just underrated. I've replaced them in TVs, monitors, power supplies all my life.
I'll just replace the exploded one and see if it runs first. I got a pack of 10 anyway.
If I can't save it, it's spares for others.
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If a capacitor ejects itself
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If a capacitor ejects itself from the motherboard could this be the first step in electronic propulsion?
Nah.
Might be the first step in capacitor over clocking though.
Rofling
A Proud member of the O.F.A. (Old Farts Association). Be well, do good work, and keep in touch.® (Garrison Keillor)
Tom M wrote:If a capacitor
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Sometime around 1984, I applied power for the first time to a first article board on which I had populated the components myself and taken it to a wave soldering shop.
There was a sharp noise. On review, I realized that I had plugged in one of the tantalum capacitors backwards, and it had responded to power application by expelling the tantalum slug at appreciable speed.
What makes this a bit more exciting than it might seem is that it was a routine practice to remove power promptly after first application and move my hand over the components to see if one was overheating enough to notice. After the expelled slug event, I took good care to make sure my hand was not actually over the board at the moment of power application.
I think a lot of companies
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I think a lot of companies overclock capacitors. I often replace therm in TVs, computer equipment, even CFL and LED lightbulbs (one of which was 1 month old!), and insert one that can handle more voltage, and/or I put a low ESR one in.
When I were a lad, I didn't know soldering irons are sometimes earthed. I soldered a live piece of equipment (some disco lighting) which had a loose connection. The connection I was soldering was one end of a power transistor, which had 240V at the other side. It was expecting to power a 60W lightbulb, not a dead short to earth. The transistor split in half and shot a piece of it right across the room, narrowly missing my friend's face. He thought it was amusing!
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Those pictures are
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Those pictures are impressive. I am VERY glad I have not ever had that experience!
Tom M
A Proud member of the O.F.A. (Old Farts Association). Be well, do good work, and keep in touch.® (Garrison Keillor)
Hey stuff explodes all the
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Hey stuff explodes all the time. A few months ago I was at my parent's house and there was a bang and my mum shrieked. I walked into the kitchen and said "Mmmm..... burnt thyristor, lovely smell, I take it we're not having toast today then?"
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I am now picturing you
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I am now picturing you walking into the kitchen in a Cavalry hat, going: "I love the smell of burnt thyristor in the morning"...
E pluribus unum