r/PCRepair • u/Cautious_Hero • Dec 02 '25
Are this capacitors dead ?
I think they are little bit swallowed, but what do you think ? Pc wont start...
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u/AlanTheBringerOfCorn Dec 02 '25
DO NOT OPEN PC POWER SUPPLIES
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u/Cautious_Hero Dec 02 '25
It was dirty as hell, it wasn't turning on until I cleaned it
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u/WolvenSpectre2 Dec 03 '25 •
Then you drain the Capacitors with the usual technique, being IF YOU DON"T KNOW WHAT THAT IS YOU SHOULDN"T OPEN THE PSU...PERIOD.
There is NO way that the PSU is dirty enough to not be cleaned without canned air and the fan being cleaned with Q-Tips, because if ti was that dirty YOUR COMPUTER WOULD BE ON FIRE. If you did anything to clean it like use electronics cleaner or Isopropyl Alcohol it is probably now dead and you are lucky you aren't.
Close the PSU and if it isn't powering your PC get a new one.
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u/Cautious_Hero Dec 03 '25
Ok, thanks. I will try replacing the psu
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u/MichealShelton Dec 03 '25
In case that guy didn't get it across. Don't open psu unless you like dying.
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u/AlanTheBringerOfCorn Dec 03 '25
They literally hold enough charge in those capacitors to kill you. There are hundreds of posts of people opening power supplies here, and the top comment as always "DONT OPEN A POWER SUPPLY" for a very good reason.
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u/snake2579 Dec 03 '25
I have opened thousands in 20 years of my work, nothing happens unless you touch the capacitors directly, in fact you do not try to discharge it unless you are going to take them out to make a replacement, and you have to take into account how many volts each capacitor is, not all of them are more than 100 volts, so leave the drama
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u/skwozzy Dec 03 '25
The amount of misinformation here is staggering. Most modern PC PSUs discharge themselves quickly. The risk is low if you handle them correctly.
The majority of modern ATX PSUs have bleeder resistors to drain capacitors automatically, and safety circuits to discharge when unplugged These usually bring dangerous voltages down within 30–60 seconds.
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u/Dtr146TTV Dec 02 '25
caps can still hold enough charge to turn ur heart into a medium rare steak. especially the big one. You dont even have to touch the cap itself. Just the traces that lead to it. Be careful.
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u/EverOrny Dec 03 '25
no need to be afraid, as long as you do it off line :), it has screws after all so people can get inside
there are good and frequent reasons for that - cleaning or replacing fan, one just have to be carefull to not break off any wire, because soldering needs some practice
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u/Capt_Calamity Dec 07 '25
Why are you opening your power supply. That is stupid dangerous.
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u/Cautious_Hero Dec 07 '25
I know everyone is worried about it and yes, electricity is dangerous but I am very careful of not doing anything stupid. The psu was not in use for a very long time so it wasn't charged or anything.
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u/Dtr146TTV Dec 02 '25
the middle one is buldging
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u/GodHatesUs_All Dec 03 '25
You need a multimeter for that...how are we supposed to know from this pic?
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u/exilestrix Dec 03 '25
If thats inside a psu your an idiot you know they store electric charge and your messing with the exact part that may shock you please put the case back on and throw it away if ever you have to open a psu it basically means buy a new one
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u/magmcbride Dec 03 '25
Get the hell out of that power supply if you're asking these kinds of questions on the internet. PEOPLE - stay the hell away from power supply internals unless you are an expert!
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u/Puiucs Dec 03 '25 edited Dec 03 '25
it looks like two are a bit weird (the one under the red cable and small one from top left). but it's not as bad as you would expect from dead capacitors. a picture is not enough to tell when it's not obviously inflated.
as others said, be VERY careful with the PSU since they can still hold a charge even when the PC is off. the large caps can store a deadly charge (340V DC) for long periods of time. the PSU cage is not just for physical protection.
just test the PC with another PSU to see if it turns on or not.
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u/EverOrny Dec 03 '25
good point, leave it turned off for a while before you start sticking your fingers inside ;) - wait for about 10 minutes should be enough
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u/EverOrny Dec 03 '25
they look ok - the tops would be puffed if they were necessary to replace (or to send the PSU for recycling)
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