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Old 17 December 2019, 03:03   #1
Starglider 2
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Why did this A4000 PSU just explode? [video]

Um hello. So, on the advice of someone, I tried changing the fuse in this A4000 PSU. It had previously stopped working (quietly) when someone plugged it into a 240V supply (because it's a 120V US model).

I took out the 250V rated 5A fuse and replaced it with a 250V 5A fuse. Then this happened...

[ Show youtube player ]

As you can see there are multiple failure points.

I have one question. WHY?!!?
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Old 17 December 2019, 03:35   #2
aeberbach
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Could the fuse have survived long enough during that 240V connection to damage parts downstream, causing the next connection to make a more spectacular failure? That's my guess. 240V applied won't kill the fuse instantly - especially if the fuse is "slow-blow" as you often find in power supplies - will have a 'T' not a 'F' in the part number. It may be impossible to tell now but that 8-pin device could have fused internally, making it a lightshow waiting to happen.
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Old 17 December 2019, 03:42   #3
Starglider 2
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Quote:
Originally Posted by aeberbach View Post
Could the fuse have survived long enough during that 240V connection to damage parts downstream, causing the next connection to make a more spectacular failure? That's my guess. 240V applied won't kill the fuse instantly - especially if the fuse is "slow-blow" as you often find in power supplies - will have a 'T' not a 'F' in the part number. It may be impossible to tell now but that 8-pin device could have fused internally, making it a lightshow waiting to happen.
Actually I think that's exactly right. Darn it. And I think that would have been impossible to diagnose in order to prevent it. So I guess I don't feel quite so bad now.
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Old 17 December 2019, 03:42   #4
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Hi Peri,
I second what aeberbach says. Replacing the fuse was nothing wrong (the fuse parameter 250V doesnt really matter in this case, it's just some kind of max voltage for the fuse). Also think parts got damaged before and on 2nd connection they blew up.
That's a real cool video of magic smoke escaping by the way!
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Old 17 December 2019, 03:44   #5
Starglider 2
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Quote:
Originally Posted by Nightshft View Post
Hi Peri,

I second what aeberbach says. Replacing the fuse was nothing wrong (the fuse parameter 250V doesnt really matter in this case, it's just some kind of max voltage for the fuse). Also think parts got damaged before and on 2nd connection they blew up.

That's a real cool video of magic smoke escaping by the way!
Haha well at least I got something cool out of that hot moment. It's a shame as I really wanted to fix the power supply, but I guess my original hunch was right ¯\_(?)_/¯
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Old 17 December 2019, 09:03   #6
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Time to deviate from the factory lines and go SFX with it. :-)
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Old 17 December 2019, 09:53   #7
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Houston, we have a problem. ;-)
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Old 18 December 2019, 09:47   #8
AmigaHope
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I question why C= went with a 250V 5A fuse in the first place. There is no way the A4000 PSU could be legitimately drawing 1250 watts, not even instantaneously. o.o; Clearly the original fuse did not die fast enough to save the downstream parts. Also was I that somebody? =P
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