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How can a PSu explode?

post #1 of 8
Thread Starter 
How can a PSu explode? Dont have enough power for the system or a cause of garbage PSU?
post #2 of 8
PSUs are complex pieces of technology and there are a number of parts that can blow up in one. If it's a good quality unit, then something was probably wrong with it in the first place, and if it was a piece of junk, then, well... that's just part of the game. Cheap PSUs will typically blow up or fry themselves if you try drawing too much power from them and if they don't have the right protections in place (or the protections don't kick in). There are lots of scenarios really.
post #3 of 8
I doubt a PSU would explode, as that would kill you and burn your house down. eek.gif

Now, a PSU can fail because of Overheating, Electrical spikes that it can't handle (I.E. a sudden overvolt caused by a power outage.) Or possibly bad components, such as faulty capacitors. This is why consumers lean towards PSUs that have sturdily built Japanese capacitors.

However, a more common and predictable PSU killer is age. You can expect a heavily used, and comparably old, power supply would fail soon.

Note: Even when turned off, a PSU's capacitors can still hold a charge. Don't even think about repairing one yourself.
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post #4 of 8
a psu can explode because you lit it lol jk.

cheap generic psu are always prone to get fried
    
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post #5 of 8
It won't really explode.

It could get some sparks and catch on fire but not explode.

I've had that before, could be due to high voltage peaks with a bad electricity circuit at home/town.
    
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post #6 of 8
It can "explode"
just that some parts of it short circuited and produced tiny electric "flame" that burned the stuff around it.

maybe.
   
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post #7 of 8
As far as literally exploding? No. they will not. I am not saying they cannot, lol because almost anything is possible in this world. (my opinion)

You can get melted wires, fried components, and popped capacitors. The PSU as a whole will not explode though.
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post #8 of 8
Quote:
Originally Posted by donnybrasco;12709770 
As far as literally exploding? No. they will not. I am not saying they cannot, lol because almost anything is possible in this world. (my opinion)

You can get melted wires, fried components, and popped capacitors. The PSU as a whole will not explode though.

They explode, literally. Not big Hollywood style explosions, but they are explosions.


When the current limit of a transistor or diode is exceeded and it catastrophically fails the component can blow apart with a bright flash of electrical discharge and a small shockwave. Therefore an explosion.

Other times there may be a less catastrophic failure that involves merely sparks, which can catch nearby components or the PCB on fire.

Some components in particular have very pyrotechnic failure modes, like NTC thermistors. Certain failure modes of that component result in huge showers of sparks. Here's what an NTC thermistor failure can do:

IMG-0591.jpg
Edited by Phaedrus2129 - 3/12/11 at 6:28pm
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