Thanks to Gerard for sending in this pre-detonated multi-port USB power supply.
Given the isolation between the mains voltage primary windings and the low voltage secondary windings, perhaps it's a good thing that it exploded.
It's a shame, because the transformer is the only bit that really lets it down. The circuitry looks like a textbook switchmode based around a dedicated chip.
The reason for the failure is not clear, but a short has occurred that has made a track on the output of the rectifier blow like a fuse and cause a more serious short by virtue of the metal laden plasma.
The glass fuse has blown in half s they are not really suited to breaking high current faults.
I'd guess it was chip failure that initiated the explosive event.
The mystery chip is just an LM339 quad comparator for controlling the channel activity LEDs.
Given the isolation between the mains voltage primary windings and the low voltage secondary windings, perhaps it's a good thing that it exploded.
It's a shame, because the transformer is the only bit that really lets it down. The circuitry looks like a textbook switchmode based around a dedicated chip.
The reason for the failure is not clear, but a short has occurred that has made a track on the output of the rectifier blow like a fuse and cause a more serious short by virtue of the metal laden plasma.
The glass fuse has blown in half s they are not really suited to breaking high current faults.
I'd guess it was chip failure that initiated the explosive event.
The mystery chip is just an LM339 quad comparator for controlling the channel activity LEDs.
"Hell Yeah, I Love Shit That Blows Up" – And so do I.
I have the same one been using it for years now . Probably go bang tomorrow now I said that .
I was wondering why I was seeing so many ceramic fuses lately, compared to the mostly glass ones that I used to see. I recall the occasional glass one that appeared to be filled with sand, too, and didn't know why that was.
More blown up shit! Great…….. did you find out why? Did I miss it? By the way watched your ‘what’s in your handbag ‘ video and looked at the channel who you referenced and boy what a bore…….won’t go there again.
Cheers Clive
I use the cheap Dollar Tree power supplies or the ones you get from Ebay that look like the Samsung kind that you can get for like 10 for a dollar approximately, the one thing that fails and all of these when you drive LED string lights or the fairy lights is the 470 millivolt 10 volt capacitor, that gets hot enough to melt the plastic on the case itself where it sits on top against. I'm not actually used to seem capacitors get really hot but so far that's been the primary failure of every single one of these power supplies and I have.
I'm going to try to experiment to just go and put in a better quality cab and see if that works cuz it's usually the green capacitors that are on these that are the weak point
"Electrical Inferno" thanks Clive, found the name for my metal band
The fire burnet, but instead to fix, u destroyed it
Sniffing skidmarks! Eeeeuugh 😂
Great ! Wee bits on bench building up exponentially II
The electrolytic capacitor closest to the transformer looks like it was dead as well. If that diode next to it gets even modestly warm, that's a layout failure.
I had a Belkin 2 socket adapter(Think one was 1mah and another 3.3mah) and I assume the exact same thing happened to mine. I'm not sure hold old it was or when it burst but the fuse was decimated inside and half the board charred. Probably wasn't home when it went, which is scary.
Mortui vivos docent.
Oh… I have exactly the same charger…
Is it me or does one of the caps next to the chip have a bulged top?
"Oh I think I may be out of plumbs here" I love the queens english!
Interesting phrase – Is "onto plums" a reference to gaming machines where the plum symbol is not rewarding?
Clive, if you take a wee bit of heat transfer paste and smash it into the engraving on the chip–once you wipe off the excess–the chip numbers are clear as day…