Repairing cheap power supplies!

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230ac to 24v DC supply switching transistor values yougive me

i have same one .... and I mistakenly put the switch on 110v and connected the power supply to 220v input .... then it stopped ... small burning smell and no obvious burning part ... no 24 DC output ... i dont know how to fix it ... if someone have face similar issue can help pls ?

I don't feel safe touching those China power supplies even if unplugged.

buy used server power supplies for $15, more reliable, designed for enterprise

good day sir ,how about fluctuating of output power suppy, it will takes an hour to produce 24dc supply ,
what is main cause or defective function,

Hi
What if the fuses keep blowing after replacinv ghe thermistor?
Bridge rectifier is ok,
Cheers

Don't bend component leads over to hold them in place. It makes it very difficult to remove those components in the future and you risk damaging the pads and tracks.

You missed the 2 driver transistors on the 10A supply 2 x S9014 also the 1n4148 diode.

This is probably quite good stuff - but why do you refer to yourself in the plural?

Thank you for the nice video. Please could you tell us what IC driver they use For the switching frequency. BTW do you know the switching frequency ? Bless you.

The small electrolytics in switching power supplies is a common failure point. They don't always advertise that they have failed

First video I see, then went straight to your channel.. very useful stuff mane, of course I subscribed. Keep it up 💪

I had a question, i dont know the first thing about this stuff but i always love to watch people that know about these things and how they fix them etc, pretty cool, i have a buddy that has a toolbox that came with a stereo in it, here recently it quit working, the stereo is a 12 volt job that uses one of these power supplies and i have isolated the problem to the power supply etc,looks just like this stuff your working on,i am going to buy him another one and get the radio going.

My question is, how long can one expect for one of these things to last? he doesn't mind paying 50 dollars for one of these but from what Ive seen these can be had for hardly nothing, obviously because they are made with cheap stuff, is there a workaround this? or just buy another one and it might last a year or so? he uses this radio very little and to be honest he bought this toolbox like 10 years ago and that power supply just now quit working so i guess he got his moneys worth out of the thing,lol

The less you use it the longer it will last? is that what it boils down to? thank you so much for your time and input.

Would love to see you do more circuitboard troubleshooting videos. I like the way you explain things, and even though you might not be an electronics tech professionally…… It’s always fun for the audience to watch and learn along with you.

It’s especially satisfying for guys like me who are professionals and do this full-time, to watch smart and competent folks like yourself learn and grow in their understanding of electronics.

PS… Check the zeners and diode‘s on the supply you couldn’t fix. Probably the issue it is very common.
Always think UPSTREAM of a failed component as to WHY it failed.
Don’t replace a fuse or transistor without figuring out what made it fail.

Also a somewhat lengthy load test would guarantee their function for the future.

I really enjoyed the video!

What is with the video picture not being stable? Anything moving or big scene changes is pixellated with big break up. It looked like abstract art.

Great content though.

It is so important to first analyse a fault, then to proceed with an explanation of the fault to your audience - before launching into a soldering lesson!
I hope you will view my criticism constructively by taking several steps back, and creating a foundation - before you build the house!

Hello sir, I try to fix power supply that lacking the amperage, the voltage output is fine. Can you suggest what component should I replace it? thx

need more videos for smps fault. no output, low output, like that

brother in smps flickering sound is coming how to solve it pls make a video for that and low output

very good video. Could you tell me the values of the transistors of the second source that you repaired because I have the same source but a transistor exploded. Thank you so much

Please, speak more slowly, thank you

Good tiching karte hai 👌👍👌👌👍👍👌

i repaired a desktop power supply 10 yrs ago.
All i had to do was replace a blown cap.
then it worked fine for yrs after.

Thanks for that good job ...i wan ask you if this power supply can it charging a lithium ion batterys ?? Thanks again

Getting 6V instead of 24V, tried adjusting voltage but doesn't see any change. Perhaps, potentiometer has gone wrong? Any input will be helpful Thomas. Thanks for the great video.

I got a 40 amp 12 volt version to power a 2-way radio repeater and sitting idle (muted receive mode) with less than 2 amps draw the supply failed in about 4 hours. Even when the radio is transmitting at it's 75 watts, 40 amps should be more than overkill.

Колега, през лампа сто ватова е по лесно и по безопастно.

Excelente trabajo

This isn't proper repair.

Como todos los tecnicos cambiadores de repuestos no busco cual era el problema se limito a solo cambiar piezas la idea es enseñar a detectar y solucionar los problemas

I bought cheap one from Amazon (36v 10A). Is it possible to upgrade or make more reliable it replacing its chunky components with good quality ones? Thanks for your video.

Use linear powder supplies instead.

I have found this old PSU repair vid after a hardly used Chinese PSU 160W 12V suddenly died (although I was already subbed due to your great 3D printing content). The PSU 's demise was without fanfare: the fuse is intact and nothing looks burned out. But before I discard this POS I might try replacing some caps, hopefully this will bring it b ack to life as sometimes IME the evidence for failed caps is hard to find. It is quite a mystery as the little indicator LED still lights up, which probably says something about the site of the failure to someone who knows about such things.

Thank you now I wont have to buy a new lap top my plug is loose and so mic plug. im going to try this. Is it the same on computers, lap tops?

Definitely the video is and skill is fine but to be little slow can understan and benifit more people

How can I fix the overloading on that type of power supply Sir?

1-2 Hinweis zur Sicherheit wären angebracht gewesen...

How do you use it

Do u have diagram of nes-150-12 power supply.

Why didn't you troubleshoot the 10amp one??

I have liké that cart only got a problem i dont know the second Switch transistor which exist in top of the card .i know only Switch transistor which exist beside it called .D 209L.can i make the same in the empty place beside it 😮and thank you.

Just starting in repairing board(77 years old) great video,thank you. 😎😎😎

excellent video .. thx

this is the extent of the capability of most so-called repair experts, burnt components are bad , is the fuse ok?, yes, then this is a no fix. and we also charge you for a repair attempt fee. with great power comes great responsibility

I tried to repair a cheap Chinese one, 12V x 5A, which is smaller than older Chinese ones 12V x 3A. The Mosfet and a power resistor was brownout, but there was also an unmarked IC for main SMPS control that was burned.
No IC known/available, no possible repair!

My findings so far for such cheap SMPS: (1) PREVENTIVE = Use them for up to 50%~60% of stated current. In that case of a 12V x 3A, drain a maximum of 2A from it. (2) CORRECTIVE = In case they start to “humm” or get lower voltage, change the output electrolytic capacitor for new ones with Double the operating voltage and possibly a larger uF capacity (if it fits inside the available space and height.

Can anyone help me with my meanwell power supply? The company is useless they dont honor their warranties.. no dc output.