Hail to master sorin,he talks like we are his friend and student at the same time,so calming and easy to understand the way of his thinking and explaining,please dont close this channel or delete your video if anything happen,its like a well of knowledge for technician like us who have been in this repair field so long but never convinced enough everytime facing problem like this,thanks so much
Great demonstration of ripple/ lack of current. When you said I trust the tester, I was saying "only as an unloaded test". It's fun to teach the young ones about power supply ripple and how it can trap you
MY friend Sorrin Congratulations Keep teaching us!!! It is happiness people like you to spread their knowledge and experience to all of us .Thank you ~~ Nikos from Athens~~ :)
Sorin sir your videos are keeping so excitement, gives us the new rule to find fault in electronic. I have no word to say. Really gr8 . Alot of Respect.
Thank you! I am going through about 20 or so old desktop computers I have accumulated over the years and the current resurrection attempt has exactly this issue 5 volts but no start!
Nice tip jamming in a capacitor externally to diagnose such behaviour! Suspect most people would just replace the entire PSU on desktops :( P.S. Saw part 1 now and understand the reasons why it was necessary to fix - suspect a lot of situations like this over time - well done for being there to help!
I permanently add some medium-value eletrolytics on the drive ends of long molex/sata power harnesses when I build custom large drive arrays - does no harm with sensible component choice and where data integrity is important every little helps to keep drives spun up and glitch-free when the mains gets dirty (especially when the UPS kicks in or gets overloaded) The actual term is "hold-up time" if you are specifying PSUs. This extra capacitance is in parralel with the PSU output caps and because some of the high-frequency ripple current is absorbed by the added caps it reduces the circulating HF currents in the PSU o/p caps - I have a hunch that this prolongs their life a little as a side effect (remember, these are low ESR caps and we are talking about high harminic content from the chopper design) I also add 470uF or 1000uF on the DC plug end of critical router, modem and switch DC power leads for the same reason. (just cut the cable 3cm from plug, insert a double screw term connector and put a electrolytic across the supply)
i love this repair sagas. i'm behind netflix and hbo series, because this channel totally changing my life. thanx Sorin. again. i watched most of the videos and already applied the learned knowledge.
Sorin , I like your videos very much :-). Your method with an external capacitor parallell on the 5 V line is very good. But you could measure the 5V DC line with your multimeter on AC Voltage. Then you will measure the AC (ripple) component, it should me less than 0,1V. I am shure if you should measure that you will measure a AC component of > O,5V or more ;-). In this way you can diagnose it without an oscilloscope. greetings , Vic
Sorin Stats: Rank (GOD) Eficiency 100% Repair Knowlogde 100% Sparks and blowups: 100% Humor Repairing 3000% Teorical and Practice Wisedom: 1000% Manufacturer Criticism: 100% Schematics 0% i dont care this sheEEEt) Lesssons of life: 100% Nice channel, great worker, better human being. Thanx.
I got a dead psu from a friend but could not see any visible damage. After watching some of your videos I think I'm ready to give it another try to fix it. Thanks !
excellent! I would never have thought of that.. The offer still stands.. you can come fishing with me.. although we probably won't find such mysteries out fishing.. except maybe what kind of sandwich is his for lunch! and should I eat it or use it for bait? Thanks Sorin! your one smart fella!
Brilliant breakdown and explanation, Sorin Could you please explain when you apply voltage to 5,12volts how many amps you limit the circuit to, many thanks for your excellent videos sorry if I seam stupid I am just old but I love to learn.
It's the same with automotive diagnostics, you can test a circuit and you can see 12 or 5 volts with your multimeter but if the wire is corroded it will still show voltage, but when you put a load on that corroded wire it not supply the correct voltage.
To avoid to blow up things if you not sure you can make serial circuit with power cable (ac supply), light bulb and power socket where you can attach board that you testing. If the thing meant to blow up nothing will happen only the bulb will light. You are welcome 😊
Sorin those were a couple of nice videos about, I learned a lot. I never saw you fix an UPS it would be good if you make some video fixing an UPS. Thank you for sharing your knowledge and have a good week end.
Interesting video, thanks. So when someone asked if you trusted the ps tester they were right. You said yes but actually it didn't show the error in the 5v line.
This powersupply testers only test the voltage in idle mode and not under power. It also don´t shows the ripple. When the blown up capacitors are not changed the output has ripple and the PC is instable. I had this problem several times. It is easy to find out with a well working other ATX powersupply.
well it would be nice to see more of Desktop motherboards Diagnosis & Desktop ATX PSUs !! WELL DONE Again very nice video Sorin! We Love you : ) ps.I was thinking it was a mosfet on-off state.. issue (that I've learned to think that way from you & your previous videos..) Thanks ~ God Bless you !
yes, output capacitor. No oscilloscope? you could load a small lightbulb on the 5v rail and look for changes in intensity also versus the clean lab psu. I never have luck with bulging capacitors, often just as likely to be a normal one, desolder and test each one on output side
Good video Although i am trying to find video on diagnosing Overheating power supply of HP 519334-001 463952-001 HSTNN-LA03 Input:100-240V / 50-60Hz Output: 19.5V-9.2A-180W It runs so hot i could put a frying pan on it. So if you ever do a video on these type of desktop chargers and a way to cool them down with a fan as they are fan less it could be be very helpful. or a way to diagnose what is making it run so hot.
You should read my comment on part 1 and after that, replace the bulging caps. Also, replace that cap you put in at the rectifier for what should be there: a MOV, or cut out the wires to the input voltage selector switch. Again, read my comment at part 1.
Altho I replaced my psu with a new one, you clearly demonstrated and explained the mysterious isues I had. and it might have been the dry capasitors all along. I might use my osciliscope on some devices I need to fix, a old/new tool explained by you for me to fix scary psu isues (scary as in, 240v is kinda scary for me :P ) anyway, im not just gonna probe and connect it, im learning, and testing and buy if posible just a new psu. But the dry cap isue definitly got me doubting myself before. great video thanks
I had this type of issue with a 12V 1A chinese charger. I plugged some 12V fans on it for a total current of 0.45A. It worked for few months and then it start randomly working exactly like on the video. i found a fat capacitor when i opened it. The charger was likely not realy 1A and there was only one small capacitor witch was overused and end to die.
so …. the mov (metal oxyde varistor) in this case disguised as a capacitor, and there to protect against power surges, wasn't replaced … should be fine ! :D
Sorin, I have the same tester. It's good only for showing voltage output, but not against proper working OverCurrent/Voltage or UnderCurrent/Voltage protection or Short Circuit. And the ripples during heavy or optimal efficiency load? The problem with somewhat faulty PSU is that it will fail sooner or later and then we hope it won't kill оur HDD or other expensive component. Shit happens, right? Anyway there are comments that the average user will replace the PSU. Yes, it's ok to do that when the replacement has better quality and done properly. Other people will say that game buy-throw-buy sucks ... We know that but ask yourself what will happen if there's no steady selling - no implementation of improvements, no money flow in already stagnated economy, no work for most of us, etc ... We are all smart and know what will be the outcome
beware the fat caps sorin ! i actually guessed this one right ! :) the motherboard didnt like all that ripple, so refused to turn on the psu............i thought for a moment you were going to do a dodgy job and just solder that cap to the commector ! lol :)
if you see bad cap.and not change it may be hdd dident work well and fail soon .trust me i see to many hdd smart "problem with 5 volt supply" and on the startup side "cap near Purple color " cause not turn on or too many push power button . to start pc never say oh i dont have time for change bad cap.almost damage everything
Does that tester actually load the power supply? Many PC supplies need an adequate load on all rails to accurately be tested, if it's just measuring the voltage or drawing a few watts from each rail then it might not be giving the full picture.
Any tester that load tests computer PSUs is going to be a big chunky thing with heatsinks & fans in it. All the small ones do is check the voltages are present at sane looking values.
@@uK8cvPAq You still have to get the fact that someone might load it heavily or for an extended period past the safety regulators. & if it's only capable of a 10 or 20% load for a few seconds that doesn't permit testing for PSUs which shut off when the load reaches 80 or 90% (I've seen them fail that way).
Hello Sir, Maybe you can help I have here a Laptop Asus K52J i5 10 years old, dead. no lights no bios; bios chip has no 3.3V on pin 8 and is 42 OHMS from pin 8 to Gnd; Motherboard 3.3V keeps going OSCILLATING up and down from 3.3 to maybe 1 volt or less,in less than a second,hard to read meter; 20 volts charger in As soon as charger is plugged in, 0.60Amps flow ;600mA, 12 watts ; power button does nothing,no voltage on any of the 5 pins. BGA Chipset BD82HM55 Heats up fast, will burn your finger in 15-20 seconds; Laptop was working before,suddenly shut down,never went on again; no bios, no led,nothing Question: do you think if i replace ONLY the HM55 ,that it will be it ? Thanks and keep your videos coming.
If you connect a load at this 5Volt rail and measure the voltage i believe that you will see the problem. If it is not close to 5Volt you find the problem.
Hail to master sorin,he talks like we are his friend and student at the same time,so calming and easy to understand the way of his thinking and explaining,please dont close this channel or delete your video if anything happen,its like a well of knowledge for technician like us who have been in this repair field so long but never convinced enough everytime facing problem like this,thanks so much
So many clever words in one place, such people are rare. I am just delighted with your knowledge and experience, a big greeting from Serbia, Jagodina
To matori!
He is really a great teacher.
Dosta ljudi iz Srbije gleda Sorina. Je l' se bavite vas dvojica popravkom elektronskih uređaja?
@@aleksandarjakimov6830 Ja kao hobi zanima me.
Da bavim se dugi niz godina,extra su klipovi.
Ja samo da se upisem 🙂
Wow. You finish this video with a golden key. Thanks for your explanation.
I would have convinced myself that it was a motherboard issue, but now I know better. Thanks for sharing your knowledge Sorin.
Great demonstration of ripple/ lack of current. When you said I trust the tester, I was saying "only as an unloaded test". It's fun to teach the young ones about power supply ripple and how it can trap you
More pc motherboard repair please .thanks.Greetings from Serbia
Excellent troubleshooting from part 1 all the way to part 2. This was a good video. Good job. Keep up the great work
MY friend Sorrin Congratulations Keep teaching us!!! It is happiness people like you to spread their knowledge and experience to all of us .Thank you ~~ Nikos from Athens~~ :)
Sorin sir your videos are keeping so excitement, gives us the new rule to find fault in electronic. I have no word to say. Really gr8 . Alot of Respect.
Thank you! I am going through about 20 or so old desktop computers I have accumulated over the years and the current resurrection attempt has exactly this issue 5 volts but no start!
So many time lost in other tech channels, and Mr, Sorin in a few minutes says evething we need to know...thanks!
Nice tip jamming in a capacitor externally to diagnose such behaviour! Suspect most people would just replace the entire PSU on desktops :(
P.S. Saw part 1 now and understand the reasons why it was necessary to fix - suspect a lot of situations like this over time - well done for being there to help!
I permanently add some medium-value eletrolytics on the drive ends of long molex/sata power harnesses when I build custom large drive arrays - does no harm with sensible component choice and where data integrity is important every little helps to keep drives spun up and glitch-free when the mains gets dirty (especially when the UPS kicks in or gets overloaded)
The actual term is "hold-up time" if you are specifying PSUs.
This extra capacitance is in parralel with the PSU output caps and because some of the high-frequency ripple current is absorbed by the added caps it reduces the circulating HF currents in the PSU o/p caps - I have a hunch that this prolongs their life a little as a side effect (remember, these are low ESR caps and we are talking about high harminic content from the chopper design)
I also add 470uF or 1000uF on the DC plug end of critical router, modem and switch DC power leads for the same reason. (just cut the cable 3cm from plug, insert a double screw term connector and put a electrolytic across the supply)
So I go away thinking I've learnt a useful thing and then get something additionally interesting on top ;) Thanks Gord Slater
i love this repair sagas. i'm behind netflix and hbo series, because this channel totally changing my life. thanx Sorin. again. i watched most of the videos and already applied the learned knowledge.
Sorin ,
I like your videos very much :-).
Your method with an external capacitor parallell on the 5 V line is very good.
But you could measure the 5V DC line with your multimeter on AC Voltage.
Then you will measure the AC (ripple) component, it should me less than 0,1V. I am shure if you should measure that you will measure a AC component of > O,5V or more ;-).
In this way you can diagnose it without an oscilloscope.
greetings ,
Vic
excellent video. very helpful and as usual, brilliant delivery
Thank you!
most experts refuse to share their knowledge, but ure not ,grate work
Great video Sorin....Good troubleshooting !
brilliant sorin brinlliant ! As usual, you have such a brilliant explanation for every electronic device's diagnosis!!
Sorin Stats: Rank (GOD)
Eficiency 100%
Repair Knowlogde 100%
Sparks and blowups: 100%
Humor Repairing 3000%
Teorical and Practice Wisedom: 1000%
Manufacturer Criticism: 100%
Schematics 0% i dont care this sheEEEt)
Lesssons of life: 100%
Nice channel, great worker, better human being. Thanx.
you make exelent videos, where i learn a lot, thank you
that is exactly the perfect explanation .. biig hi from algeria sorin
@Polat Ashraf iv mixed it with french coz it was at the same moment which iam commenting in french :3 lol
I got a dead psu from a friend but could not see any visible damage. After watching some of your videos I think I'm ready to give it another try to fix it. Thanks !
If the cap is blown beyond recognition, how do I size the correct uF capacitor?
Mr. Sorin that was a very nice short but so helpfull video. Thank you for sharing your experience!
Time for Sorin
to build a new power supply tester that detects supplies that are only intermittently spiking 5v (or 12v, or 3v)!
i love your videos . from kenya.. stay safe
excellent! I would never have thought of that.. The offer still stands.. you can come fishing with me.. although we probably won't find such mysteries out fishing.. except maybe what kind of sandwich is his for lunch! and should I eat it or use it for bait? Thanks Sorin! your one smart fella!
Brilliant breakdown and explanation, Sorin Could you please explain when you apply voltage to 5,12volts how many amps you limit the circuit to, many thanks for your excellent videos sorry if I seam stupid I am just old but I love to learn.
It's the same with automotive diagnostics, you can test a circuit and you can see 12 or 5 volts with your multimeter but if the wire is corroded it will still show voltage, but when you put a load on that corroded wire it not supply the correct voltage.
To avoid to blow up things if you not sure you can make serial circuit with power cable (ac supply), light bulb and power socket where you can attach board that you testing. If the thing meant to blow up nothing will happen only the bulb will light. You are welcome 😊
I don't think he works without light bulbs in series
These are really fun to watch, even as an EE :D
Thanks for the detail explanation. Learned a great lesson
Sorin those were a couple of nice videos about, I learned a lot. I never saw you fix an UPS it would be good if you make some video fixing an UPS. Thank you for sharing your knowledge and have a good week end.
Excellent! Somethings things are how as they appear to be. A valuable lesson !
Interesting video, thanks. So when someone asked if you trusted the ps tester they were right. You said yes but actually it didn't show the error in the 5v line.
This powersupply testers only test the voltage in idle mode and not under power. It also don´t shows the ripple. When the blown up capacitors are not changed the output has ripple and the PC is instable. I had this problem several times.
It is easy to find out with a well working other ATX powersupply.
This was a nice one. Thanks from France.
tks for sharing all this knowledge .. greatings 🇹🇳
well it would be nice to see more of Desktop motherboards Diagnosis & Desktop ATX PSUs !! WELL DONE Again very nice video Sorin! We Love you : ) ps.I was thinking it was a mosfet on-off state.. issue (that I've learned to think that way from you & your previous videos..) Thanks ~ God Bless you !
Great maybe you can check with the multimeter in ac mode so you can see the rippel as ac voltage...
thank you Sorin, that was very informative video.. nice job!!!
yes, output capacitor. No oscilloscope? you could load a small lightbulb on the 5v rail and look for changes in intensity also versus the clean lab psu. I never have luck with bulging capacitors, often just as likely to be a normal one, desolder and test each one on output side
thanks,now i can repair 2 damage power supplies my own.hard to find from market .i had the same issue on them
amazing video professor.bravo.................thenks for this video
ASA ESTE SI IN CAZUL BATERIILOR CAND AU TENSIUNE DAR NU SUFICIENT CURENT . CU RESPECT OVIDIU.
Had intermittent one recently, but was as boring as just being the power button on front of case. Switched over to reset button for power.
That was a nice one ;)
Nice one master, you miss the caps on the secondary section, I saw it in ur first video
Good video Although i am trying to find video on diagnosing Overheating power supply of
HP 519334-001 463952-001 HSTNN-LA03
Input:100-240V / 50-60Hz
Output: 19.5V-9.2A-180W
It runs so hot i could put a frying pan on it. So if you ever do a video on these type of desktop chargers and a way to cool them down with a fan as they are fan less it could be be very helpful. or a way to diagnose what is making it run so hot.
Hello,you do great and intersting work,that why i subscribed last night,keep up the cool work. greetzz from Belgium.
I highly recommend you to buy an ESR meter. It is the only option to really test the caps.
This are nice things to do.
Thank you for the the time.
Good stuff! Thanks very much!
You should read my comment on part 1 and after that, replace the bulging caps. Also, replace that cap you put in at the rectifier for what should be there: a MOV, or cut out the wires to the input voltage selector switch. Again, read my comment at part 1.
This one was great . Would be even better if you could show the ripples on a scope later
You are my hero!
Good tips!
hello sorin. were waiting for you to make videos on how to diagnose a desktop mobk just like what u did in laptops mobo. were waiting. tnx
Thank you for this movie.
Altho I replaced my psu with a new one, you clearly demonstrated and explained the mysterious isues I had. and it might have been the dry capasitors all along. I might use my osciliscope on some devices I need to fix, a old/new tool explained by you for me to fix scary psu isues (scary as in, 240v is kinda scary for me :P ) anyway, im not just gonna probe and connect it, im learning, and testing and buy if posible just a new psu. But the dry cap isue definitly got me doubting myself before. great video thanks
I had this type of issue with a 12V 1A chinese charger. I plugged some 12V fans on it for a total current of 0.45A. It worked for few months and then it start randomly working exactly like on the video. i found a fat capacitor when i opened it. The charger was likely not realy 1A and there was only one small capacitor witch was overused and end to die.
You beautiful man, thank you for helping us understand
Very informative! Could you plug in the extra capacitor on one of the other. Drive Connectors etc (5v to ground) and have the same results ?
no that is not the standby 5v ... the capacitor is bad on the purple wire ... the 5v on the normal output is red
Watch the video carefully - he addresses this question, it's yes.
Thank you .
You changed a varistor with a capacitor??
Very nice and helpfull video! Thank you Sorin!!!
How big should be the testing capacitors?
That fake five volts, it's surface charge, that's why you should test all lines of psu under load a resistor or light bulb 💡 😃
wow sorin you are a master "chapeau"
so …. the mov (metal oxyde varistor) in this case disguised as a capacitor, and there to protect against power surges, wasn't replaced … should be fine ! :D
did you change the MOV? People were saying you thought it was capacitor? The blue component? They were saying in comments it is a MOV?
Sorin, I have the same tester. It's good only for showing voltage output, but not against proper working OverCurrent/Voltage or UnderCurrent/Voltage protection or Short Circuit. And the ripples during heavy or optimal efficiency load? The problem with somewhat faulty PSU is that it will fail sooner or later and then we hope it won't kill оur HDD or other expensive component. Shit happens, right?
Anyway there are comments that the average user will replace the PSU. Yes, it's ok to do that when the replacement has better quality and done properly. Other people will say that game buy-throw-buy sucks ... We know that but ask yourself what will happen if there's no steady selling - no implementation of improvements, no money flow in already stagnated economy, no work for most of us, etc ... We are all smart and know what will be the outcome
Sir how much voltage i set in power supply in desktop computer ( smps)
Another great knowlege. Thank you.
beware the fat caps sorin ! i actually guessed this one right ! :) the motherboard didnt like all that ripple, so refused to turn on the psu............i thought for a moment you were going to do a dodgy job and just solder that cap to the commector ! lol :)
NIce to see you do PSU-s :) Want more :)
you are prof Sorin
eu cred ca ai un condensator devalorizat in sursa...in videoul anterior am vazut doi electrolitici umflati care nu i-ai schimbat...succes!!
A great lesson thank you :)
did you check the capacitors on the secundary of the power suplly ? they whasn´t looking god
Amazing
if you see bad cap.and not change it may be hdd dident work well and fail soon .trust me
i see to many hdd smart "problem with 5 volt supply"
and on the startup side "cap near Purple color " cause not turn on or too many push power button . to start pc
never say oh i dont have time for change bad cap.almost damage everything
Great trick, never thought of that.
Does that tester actually load the power supply? Many PC supplies need an adequate load on all rails to accurately be tested, if it's just measuring the voltage or drawing a few watts from each rail then it might not be giving the full picture.
Any tester that load tests computer PSUs is going to be a big chunky thing with heatsinks & fans in it.
All the small ones do is check the voltages are present at sane looking values.
@@beardyface8492 You don't need to load it down much and for long.
@@uK8cvPAq You still have to get the fact that someone might load it heavily or for an extended period past the safety regulators.
& if it's only capable of a 10 or 20% load for a few seconds that doesn't permit testing for PSUs which shut off when the load reaches 80 or 90% (I've seen them fail that way).
Hello Sir,
Maybe you can help
I have here a Laptop Asus K52J i5 10 years old, dead. no lights no bios; bios chip has no 3.3V on pin 8 and is 42 OHMS from pin 8 to Gnd;
Motherboard 3.3V keeps going OSCILLATING up and down from 3.3 to maybe 1 volt or less,in less than a second,hard to read meter; 20 volts charger in
As soon as charger is plugged in, 0.60Amps flow ;600mA, 12 watts ; power button does nothing,no voltage on any of the 5 pins.
BGA Chipset BD82HM55 Heats up fast, will burn your finger in 15-20 seconds;
Laptop was working before,suddenly shut down,never went on again; no bios, no led,nothing
Question: do you think if i replace ONLY the HM55 ,that it will be it ?
Thanks and keep your videos coming.
Luv u sir
The hard disk is still old and can be short and unplugged
Hi, the 5v is bad smoothing because the cap is drie
HELLO SIR I HAVE HP PROBOOK 440 G1 WAS WORKING ON ITS SPEAKERS AND STARTED BLINKING THE DC JACK CONTINUOUSLY ANY SOLUTION
Smart 👍
I can't see the l.e.d. Is it lit?
JK, excellent video!
Big thanks!!!
Genius man !
Hi! Wow, wow, wow. And wow. Thanks! Keep going!
HP Beat spatial edition 15v390 lr my latop not on ont come screen not on please sand solution
how about add capacitor on 5v cable, without opening the power supply. i think it will works
oh you already do it with more easy aahahhhaha
It's dangerous so be careful.
Use your meter (AC range) to detect AC on 5V line..
How
Whatever happened to the woman that use to be up front?
If you connect a load at this 5Volt rail and measure the voltage i believe that you will see the problem. If it is not close to 5Volt you find the problem.