bigclivedotcom ... said Clive packing a pair of rubber gloves in his case for the next business trip...

Ladyfolk with expensive hairdos.

whin will you burn somthing out in a exiting maner?

I'm surprised you chaps haven't wired a bypass switch on the smoke alarms.

*bigclivedotcom* Hey Clive, I don't know why I am surprised to see you here but I am.

Happened to both Keysight and Extech. It's a wonder people still send me stuff...

*bigclivedotcom* Of course, if YOU were the one receiving the product, it wouldn't matter what company sent you something, you would always find a way to blow it up

EEVblog we test it at at least 4 times again before sending , because the capacitor was damged in installation

he did not say that it was necessarily your fault :)

On the other hand it will be a great example of how the manufacturer/supplier handles issues like this. Which is as important as the design of the product itself.

The world awaits take-2 of this review.

ok, I explain the reason and we are updating ..

Sounds completely valid, I was disappointed that Dave didn't test the output to make sure it wasn't still shorted from all the charred fiberglass too. Maybe he'll do a follow-up on this since it really looks like the board is fine aside from the burnt portion that's most likely causing the output load.

If that supply was used to power something like another SMPS or a PWM based device, it seems to me the high frequency current pulses would thermally stress that cap also.. I know he had no load on it when it happened but what had he used it for previously?

Thanks for responding Glen, glad to see it's going to get fixed.

An arc welder is just a really chunky 40-80V PSU

You could even use 4 car batteries to make a cheap 48V welder.

Wouldn't that be an expensive single use 48v welder or do the battery's actually survive?

A welder is actually a constant voltage/constant current psu. It need an highish voltage to maintain the arc, specially to start the arc. Once the arc is going, you will get only a few volts, like 10-20V, but can be quite some high amperage.

My FM transmitter uses welding cables to move current to the PA.

Or rather as a conductor.

Yep that was what I thought immediately, I have fried up some boards on my channel and with only 13.8v I got flames and arcs through the PCB itself

jh77sly yeah Dave should scratch it away a bit and it should work again

Dremel it out with a burr and epoxy coat it.

Forget that part of the PCB, it's gone, dremel it out completely. Scratch away at the traces where it isn't burnt to attach new leads.

The video itself made me laugh so hard... and than enters this comment... :D

@@TheTinkerDad Well, you know those weird funnel things that come on the end of new meter probes. Those are complimentary magic smoke funnels!

I'm a quality provider of magic smoke. Give me some components and a few kilowatts and I'll make enough magic smoke to make Pablo Escobar jealous.

lmao

Just remember to take it off before Health and Safety comes around, or you'll be emitting smoke from several holes on your body :-D

Me too!

+1

I HATE IT BECAUSE I MUST BE THE ETERNAL CONTRARIAN! :P

No you're not.

there's also a new carbon resistor embedded in the PCB

@@randomblogger2835 I thought I repaired a washing machine power supply once. It worked well for 2 loads, then let even more magic smoke out. I figured it could be the copious amounts of carbon now lying around 240v, or equally, WTF would you route the outlet hose pressurised by a pump, right above a SMPS? Dingbats.

Thanks.

True, but it really shouldn't be resetting itself even if there's a low load on the output, the module is current limited. I think there's a deeper problem.

yes, you are right , there are many protection on the board, just clean up the shorted things, it will be ok

Hes current limiting on the input supply which is why I think it was rebooting. When the current limit is reached it will reduce the voltage which results in the module wanting even more current etc etc until the voltage gets so low the module crashes.

@Clyne Griffon Yeah, you're right.

@Clyne Griffon it still caused by shorted on the output .. ,. just clear the burnted things

Good eye!

Probably just a clothing fibre but worth checking out.

Almost looks like a deliberate bridge.

rorroparo I saw that place , it should be solder splash, I guss Dave drop it mistakely when he install the case , but there is nothing with the board, it control the display . this is not from our factory, because this chip was weld STM machine, it is impossible that there is the solder splash on 2 legs. we don't weld the chip by hand..

Rd Tech "big" chip next to C16, upper left corner of it.

Yes, this. I bet there is a low resistance path between the terminals.

yes, just clean up the burnt thing, that's ok

I'm somewhat surprised Dave didn't know or comment about this.. So many of us have charred PCB:s and had to use drill/file/dremel. Perhaps he could to the followup.video on this? Mine was back on 386/486 days.. Who knew that those ** expensive VGA Graphics cards might have unfused +5V power output at the D-15 connector. One bent pin and one quite crispy PCB. Recoverable, but definitely not pretty. But hey, it worked for some years. :-)

Glad to hear you say that, my DPS3012 arrived a couple of days ago...

I did measure it and it was fine, hence the re-power test. But it's now a low value, so the re-power changed it's properties or some such.

​@@EEVblog Ok, now i see. But if you measure charring resistance with an ohmmeter, there is no power involved, so nothing but megaohms to be expected. Charring isn't a stable situation you can work with. Not as an electrician at least. As soon as you fire the power up, the coal gets active. Maybe soaking with epoxy may help instead of coal removal, but i wouldn't try, because it's always to much at stake, so i don't know.

Only wish his English is better but he's still better than most Chinese. What a great manufacturer.

thank you for your message and your support quality is our life,. I need to know all the details of the product user, the customer is my god, if they have any question, they can answer me , I can help them , it is our responsibility. thank you again

@IRFZ44 thank you , I will improve it ...

RDTech is fantastic. I have a couple of their power supplies (RD6006 and RD6012) and they have been reliable and feature rich at a great price. With the free app and wireless interface, they can even do complex multi-step voltage programs easily. RDTech have continued developing the firmware over time, improving the visual appearance of the display. Just a great product I recommend. To be fair, I was careful when I put mine together and never considered it a test of my strength…

Es el mejor servicio al cliente q e visto, llevo 6 años consultandole y nunca dejo de responder.

The Combat Engineer The problem isn't us. It's all his local competitors in the Hong Kong suburbs (aka Schenzen).

I think that’s spot on.

Agree, $20 bucks for a very nice looking power supply - I thought he meant $20 for the case and external parts, that the power supply would be additional. I've looked at these kinds of power supplies through bangood but didn't trust them. Combat engineer, great name, I served with a combat engineer unit 2004-05 in Iraq. I have a lot of respect for those combat engineers. When thinking of this experience I though EVVblog was going to need to don his bomb suit, get out the demo robot and blow the thing up. The reality of building stuff is experiencing the joy of magic smoke. Sad to say I have installed a few parts backward or reversed my transistor looking from the bottom rather than the top. I think that is why you always buy a bag of transistors. Had a power surge go through my house this summer and it took out just about every switch mode power supply, magic smoke everywhere. House full of guest, TV smoking, the kids pointing ever which direction saying they heard a bang over here and over there. I ran and hit the main breaker then set about to determine the cause. Our cable had gone out and the cable man was fixing the cable when he disconnected the cable we lost the ground path for the severely out of balance load. The US uses a two live wires180 degrees out of phase with a neutral line to carry the difference in an unbalanced load. and if all fails a ground to earth ground. The neutral line had been chewed off by the squirrels, the house was using the ground to take the difference, 80 volts on one line, 140 or 180 on the other line, and that little coax cable was carrying a lot of the ground for the house load. I think the cable guy is a believer in those safety classes now. that high voltage and a lot of currents can be finding a path through their equipment. His eyes got as big as saucers when that thing sparked, he was shaking for 10 minutes. he had his work gloves on, I had warned him of a power problem that the previous cable guy said was happening in the area. The power company said they couldn't do anything about it, it was an act of nature. I would think that the expectation is to receive a proper supply voltage with the correct neutral. Well, it gave me a chance to change a bunch of little weird fuses, and thermistors. Surprisingly that is the only thing that blew. Able to get parts off of some old boards so it didn't cost anything to fix. I did through one LED light fixture away, I didn't even try to dig through all the epoxy and tiny parts. My old analog pinball machine dimed the lights and blew a fuse but nothing was harmed a fuse in the right place. The other pinball machine did not have any impact.

I saw that place , it should be solder splash, I guess Dave drop it mistakenly when he install the case , but there is nothing with the board, it control the display . this is not from our factory, because this chip was weld STM machine, it is impossible that there is the solder splash on 2 legs. we don't weld the chip by hand.

That's may favorite tool for mystery rail shorts. My second is a high-count voltmeter with kelvin probes. Almost always either a fractured cap or a dendrite.

no , it is not time proble , we can't damaged our capacitor to test . first , it is not capacitor quality problem , ok ? if you damaged any part by force, the power supply will burnt ... in fact , the capacitor place is not good ,and this capacitor is not strong , easiy damaged by force understand ?

Failures like this happen. You can make everything perfect but then your supplier has delivered faulty components that will burst in flames. That is why I always recommend to use a non-flammable case like the one shown in the video. It has safely contained the fault, nothing but a bit of stinky smoke and no further damage. Unfortunately I have already seen the works of some people that were built on a piece of cardboard. A circuit to switch a 12V/40A load via rs232, it was just a relais, a diode, a transistor and a few resistors all glued with packaging tape on a piece of cardboard, covered with another piece of cardboard and installed into a computer. No fuses, no non-flamable containment (the metal case of the computer had some holes for the cables). But luckily it worked until it was removed without the house burning down. ;)

AniMageNeBy Es gibt auch noch eine andere Variante. Einfach in der Muttersprache schreiben und damit die Leser zwingen Google-Translate zu benutzen. Manchmal führt das zu besseren Ergebnissen als die Versuche in einer fremden Sprache zu schreiben. Aber das Englisch von Rd Tech war für mich einfacher zu lesen als das was bei manchen automatischen Übersetzungen heraus kommt. ;-)

Well, yes, maybe you should. Though I imagine it won't be easy for everyone to understand you, and let's face it: google translate (still) sucks, even though it's slowly getting better. That said, English is the international language these days, so it wouldn't be bad if everyone could use it. Speaking/writing shouldn't be too much of a problem (I'm not a native English speaker neither, but I'm doing alright, even if I say so myself ;-)). But IF you decide to write it, you can easily use a spellchecker; it helps a lot in the details or if one has been a bit too hasty. There is also no problem to install several of them (in fact, I have 3 different languages). German is not one of them, but I can understand it just fine without any translator, though granted my passive knowledge (understanding/reading it) is much greater than my active use (writing) of it, so prefer to speak in English. But, if you want to speak only to me, feel free to speak German, I have no problem with it - I don't need google translate ;-). My point was merely that, IF one does decide to speak another language, it's worthwhile having and using a spellchecker of it as well. PS. the link was actually meant for Rd Tech, since he made a whole bunch of obvious spelling mistakes and was, indeed, difficult to understand (though granted, more through his grammar construction than through his spelling). And I do not know what his natural language is, so it might even be Chinese. But I think it's better everyone tries to speak a common language, than everyone speaking his own language and let crappy translation handle things. But either way, it doesn't inhibit the use of a spellchecker.

Rd Tech You need to relax a bit, your products are ok they just need some fine tuning like any new product .

AniMageNeBy Rd Tech is the KZfaq account of the vendor of the PSU. They are in China and their primary language is probably Chinese. Automatic translation tools tend to fail horribly with that language. I normally have a better chance to understand badly written English than the result of some automatic translator. When you pasted that URL it looked like a lazy way to say that his English is bad and that is why I responded like this. His English was understandable for me. Maybe because I used the context of the video to analyze his text. Anyways, I have seen much worse English in some user manuals from China and his English was better than this! And yes, I absolutely agree with you about English as the international language. Nearly everybody understands it and it allows communication with people all around the world. And that Link was also helpful for me, because until now I had red squiggly lines under every English text I wrote and now they are gone. I didn't know that Chromium (Chrome fork) supports multiple languages at the same time. ;)

I did not see it

yes

Wasn’t sure if it was a light flare thing at first, but it certainly does look as though there is a stray splash of solder bridging the top two pins on the left side of the micro controller.

At 10:23 no solder short. So that one probably came from Dave's repair job. Or just a splash from when the cap burnt and it found it's way onto the board later by turning it over.

Yep, not there earlier. Any way that could be causing the weird readings Dave was getting later though?

this capacitor is easy damamged by force

Yeah, mech stress + thermal stress double whammy, not good.

If I buy one of these PSU modules (not necessarily the 50V one) I will make sure to unsolder that ceramic cap and fit a through hole ceramic or electrolytic instead in a better place. That is definitely not a good location for such a small fragile heat sensitive SMD cap.

Steven Birch yes, you are right , this caopacitor defect is the crack resistance is not good, so the place is not good now our engineer are designing new way, new place and new capaciotor to solve this risk ... if fact, don't use the capacitor, it still can work normally

EEVblog yes, the place is not good, I admite it this caopacitor defect is the crack resistance is not good, so the place is not good now our engineer are designing new way, new place and new capaciotor to solve this risk ... if fact, don't use the capacitor, it still can work normally

Simon Tay even you input more than 55V, you also can unsolder this capacitor, that's ok? it is just filter capacitor.

CrazyMonkeyCM32 thought the same, how didn't he try and scratch that

yes, those bunrt thing are shorted. just clean up that

Alexander Bukh you can use a knife to clean those up

just clean up those burnt things, that's ok

See my previous videos.

The charring did indeed become conductive. Basically made a crude resistor.

Life hack as they call it.

On holiday the wife complained the air-con went off when the patio door was opened... a fridge magnet and some blutack solved it... yeah, air-conning Earth's atmosphere really isn't going to work but it cleared the air of bloody moaning, that's a life hack ;)

I thought the same thing!

Surprisingly yes. One of the strange things about insulation is the surface area increase of the overall part outweighs the thermal resistance due to thickness up to a point. Those fets will get significantly hot on the plastic side allowing for reasonable heat (thermal energy) removal.

but the heat is produced on the metal tab so only radiated heat will be dissipated, i think...

No, heat is also transfered in the insulated front, just not as efficiently.

anyway I would not rely on this type of heatsink ;)

I second this. Best to physically cut a slot in the board between the output terminals to remove any chance of a conductive path.

EEVblog please scapt those to try

the capacitor was damaged by force during installation. after the video we updated it , change the capacitor and place

thank you so much for your message ,yes, we already fix it , and change the place and use strong capacitor

your dps5020 still have old capacitor ? when you buy this ?

Or cut out an isolation slot between the output terminals.

yes, you are right, just clean up those burnt those thing , that's ok

yes, you are right. in series, it will avoid this problem, but this capacitot and place are not good, we are updating

Yes, but the point Dave is making is you won't have a destructive short like in this video, because one cap is still good. The chances of both caps shorting at the same time is extremely small.

Yeah, but Dave said it would halve the capacitance when one shorted. It would actually double it. But Dave knows that, he was probably just loopy from the cap fumes.

Hyxtryx I thought he said it would halve the capacity under normal (nothing shorted) operation, which it would.

It would, but why would anybody do that? If it calls for a 100nf cap, and you want to take advantage of this "trick" (I'll call it), you wouldn't put 2 100nf caps in series, because you'd be left with 50nf during normal operation. You'd use 2 200nf caps to give you the 100nf capacitance the circuit called for. Then if one shorted you'd wind up with 200nf. Dave didn't spell it out completely, but I knew that's what he must have meant.

Proyectos LED maybe next video will be Dave making popcorn with the heat from exploding components.

Damn.

With all we've been through, sometimes I'm amazed we're in as good condition as we are !

Did I say halve? oops.

Capacitance does not _double_ in series.

Do you have a link to this information, please ?

looks like it cheeched its last chooch

ANTHONY CABALLERO Releasing the smoke is the easy bit, trying to put it back in is the hard bit.

vk3hau If you figure out how to do that, you'd make a fortune.

@@combrains1 Good eye, per Rossman, the fan isn't choochenging.

*SCHMO*KE.

What about the red hot knife with blow torches? (Glad that shit died off quickly)

and a picture of him looking surprised! If this is going the direction of the pewdiepie of electric engineering I’ll have to start looking for other channels

The title should be *"EXPLODING POWER SUPPLY, NEARLY CATCH MY HOUSE ON FIRE!! (GONE WRONG, ALMOST DIED) // 200 FIDGET SPINNERS GIVEAWAY + RED HOT KNIFE VIDEOS AT THE END!!"*

also: KZfaq CENSORED THIS VIDEO, PRESS LIKE TO STOP MY CHANNEL BEING DEMONETIZED

Rd Tech is making posts all over these comments - he says that you can remove it. I'd just check it out thoroughly and do the standard 'Smoke Test' to be sure otherwise it looks fine.

I wonder if that was there in the previous video or if that extra solder was splashed later on?

I saw that place , it should be solder splash, I guess Dave drop it mistakenly when he install the case , but there is nothing with the board, it control the display . this is not from our factory, because this chip was weld STM machine, it is impossible that there is the solder splash on 2 legs. we don't weld the chip by hand.

What does PA3 (I/O pin 17) do in your design ? The one shorted by the solder flashing to VSS_3 (GND) on pin 18 (ps- I misread your statement above initially. I understand what you meant now.)

Still 220W capable at 55V

you are totally wrong ... this is not the reason .. because the capacitor place is not good, it was damaged by external force, so it was shorted after power on

Easy to tell where you've been on the web.

Just in case.... Jet fuel doesn't need to melt steel beams. It only needs to weaken it to below the design specs, and gravity will do the rest.

Oh hell, the 'Conspiracy Theorists' have arrived, Yawn!

But there is no way that a crashed 737 made those markings in the Pentagon!!! I'm joking of course, just like everyone above is. So don't worry CoolKeys, I don't think any of the nutters are here. They all sodded off one they saw Dave's solar roadways videos.

and building 7? haha

When it was designed and tested this fan was installed on top of the mosfets just to bring their temp down to a comfortable level at full power since it obviously was seen necessary to keep a good lifetime out of it and they did the trick by this simple and easy way. Even if this type of cooling mounting is not the most efficient to cool a package like these mosfet its absolutely better then nothing and was also tested to be enough so I have no really problems with it as long as it works.

too high ? there is data to agree with it

Funny how you always seem to hear about people with units with failures, you never hear about people complaining that their units work. A few bad units doesn't mean that the whole line of product is crap, unless you have data that over 70% of total units fail, you can't say they are crap, sorry but try again.

Manufacturer is RdTech, on this board now, conducting damage control.

the manufacturer had to test it more vigurousely, maybe they're going to make their tests better now. They expected free publicity, now they probably learned a good lesson, murphy is always where you don't expect

No, that's not how it works. You send your product and you take your chances. Stuff from Keysight, Extech and others have failed on camera, no one gets special treatment. Engineers know "shit happens", it's a how company responds that matters. The fact that Glen is on here admitting it and saying it'll be fixed will grow his business rep, not ruin it.

What a nice discussion here. I like it.

Generally a very good signal-to-noise ratio in the comments on this channel, especially when Dave himself puts in a reply. :)

Understand your concern but i think it's maybe a bit harsh. I'm all for safety, but the situation was clearly under control, and who knows what the cost of a fire response is for the office alarm, plus the inconvenience for neighbours. Under the circumstances could you see it from the other side of the coin?

I've thought the exact same thing. I know that doing that is illegal in some countries.

Even if it's not illegal, it may not be something the building owner would want to see from their tenants. If the building happens to catch fire later, another tenant might sue the owner ~ "You had clear evidence that your other tenant was covering up the smoke alarm, and you did nothing to prevent this!"

Please provide Dave your address so he can send you the bill the next time it happens :P

Nothing worse than a bureaucrat. Got an iron rod up ur ass following every rule to the letter no matter how illogical, unnecessary and annoying as hell it is. Triggggeerrrred hahaha. Ok i'm good. (They're robots, Morty!)

thank you, hope you like it