Hi Sorin! Totally agree with your methods in this video. But I have important addition! Like with GPU, when you have several phases in parallel you cant point exactly which mosfet is shorted. But there is a way! If the power from your power supply going through dead mosfet its also going through its coil! So you can take multimeter and measure voltage across coils and find exactly which one is under load right now! See, very simple! No need for thermal camera and no need to push high current, even 0.1A is enough to detect short circuit this way.
You mean that only at the coil of the dead mosfet you 'll measure voltage more than 0V? Where should the power suppply be connected? At the power jack? Could you Expalin a bit more?
@@pgsss6354 Yes, you will measure more than 0V on a coil connected to the dead mosfet. Power must be connected to the shorted circuit directly. If its 19V power rail you can connect to it.
I have been following you for a long time and you are a great teacher and have interesting videos. Please ignore the negative comments and be sure that most people think only the best about you. I learned a lot from you and I'm still learning and it means a lot to me to look at some of your work at least one day. Thank you for that and greetings from Germany 😊
've been following electronic channels for a long time, I haven't come across such an exciting course in a long time. You showed us a method that is far from modern tools. That's the old school rocks over the tool-mania. Thank you Professor.👏
You did an amazing job Mr. Sorin. I always use coils to detect the short circuit, without a thermal camera or voltage injector, because the coils can never be connected to the ground, and that method that you used can lead to the exact place where the shorted component exists not just the MOSFET but any component that can cause a short to the ground like a capacitor, diode or IC. Note : When you short the two coils Next to GPU to the ground the voltage drops to 0.1 volts because that's coils are connected to the same power rail (+VCC GFX), because generally the CPU and GPU can have two power channels or more, and all that channels are connected to the same power rail (+VCC_Core or +VCC_GFX). Nicely done keep going.
Yes, if you have shorted main power you can put some very low load to it and check voltage across every coil to find exactly which one is under load right now. Easy way to find which component is shorted in that part of circuit. No need for thermal camera, no risk to burn anything.
Its Amazing to see Electronics Repair Basics_ERB comment. By the i'm also a faithful follower of your channel. Electronics Repair Basics_ERB, Electronics Repair School and AdamantIT are the best you tube channels that have taught me alot in these repairs. So seeing you here really uplifts my spirit. I love the solidarity.
I’m a complete NOOB, so please bear with me. When you say: “coils are never connected to ground” is that the same thing as saying that, they are always connected, in series? Did I get that right? Please let me know. Thank you kindly
@@maxwarfield6699 You need to read the basics of how buck and boost converters work in order for you to understand what's going on as regards this topic. There, you will se yourself how these coils are connected per each case...It's not so easy to answer your question with a simple "yes" or "no"...
This only works properly if oyu have some short on a power lane. But some shorted resistor or diaode or capacitor on any other lane will be harder to find this way. Because you still have a lot of space where that specific short can be. But still this is a very good tip!
Hi, I am a beginner student of electronics and this video taught me very well. If you post such videos for beginners, we will learn more. It's great. Keep it up.
You're the man Sorin! You found what works for you and you share it with your members. You are very talented and have a big heart. Thank you for being you!
When I had just started watching the video I said to myself, "this is going to be interesting". So I made myself a cup of coffee and watched the rest. I was right it was interesting and informational. So now it has been saved and liked. Thanks Sorin for making this educational video.
The other day I was watching one of your old videos about finding a short and you explained more or less the same thing and some of the videos are about 5 years old. This has been going on for too long and the connoisseurs will always try to be better than the master and I have seen it on so many platforms😅. Quote from NF "You cannot stop the world from complaining" and you cannot make them "better than factory"😂 ..We must remember it is part and parcel of the world going around at the speed of 30 kilometers per second in orbit around our Sun😅 Thank you Sorin for this wonderful lesson.
Thank you so much Sorin. I already do a lot of motherboard repairs. This has helped me find a short circuit on a rtx3090. ( which i could not work out due to no proper heat signal) agree with you. Those things that shall not be mentioned are a waste of money!
This is one of the most versed videos made for this matter, Sorin. Thank you! 🤗 Although probably the title should say “CC/CV power supply required”, it's fine. Excellently well explained. Concerning what you say about a “short killer”, which is something you mention hearing somewhere (Discord), and that it “triggers” you because somehow you find people using it incorrectly (“blood boils” and “insane”, you say): I know this well, Sorin, I know. It has to do with mind programming, and these things which you find @#$% are actually triggering something in you, and you react. The trigger most likely has to do with a negative mind program which you need to give up from or transmute (with the assistance of a good mind reprogramming healer if you can't by yourself) or at the very least you must learn to disable the trigger in you, so it no longer triggers you or it stops having a negative effect on you. I know this well, Sorin, and unless they are really willing to learn you cannot stop dumbass people from being dumbass; it's them who must change themselves. Thanks again. 🤗
Thank you for showing a simple, safe and practical method to locate shorted MOSFETs and capacitors using only a good power supply. In several places in the video, you read the voltage as 'zero point zero nine', 'zero point zero five', 'zero point zero one', etc instead of saying 'zero point nine', 'zero point five' and 'zero point one'. It will be nice if you can repost the video showing the corrections in text.
Thank You for this video, one of the best ! I think it will refresh brain even for experienced in repair, sometimes need to think simply logical but our heads is full and brain tricking us to look more complicated
You can use an alternative option for finding shorted mosfet. You can test every single mosfets existed on motherboard with diode test and you can just check the impedance between gate and source. And that's it and if one a mosfet which has a low impedance between gate and source , you will be 100 percent sure that the mosfet is shorted. I think this is the best and fastest way to find a shorted mosfet.
@@Evhen_Velikiyyeah i agree. In some cases if the resistance between gate and source of a mosfet is low but not completely zero , we can be suspected that the pwm ic which is related to the mosfet is faulty , but if this resistance is completely near to zero , we can be sure that the mosfet is definitely faulty.
@@armanesmaeily7087 What if you have DRMOS'es on board? You cant measure source-gate coz there is no pin outside for gates. Only way to find shorted DRMOS is to supply some safe voltage to the shorted circuit and measure voltage across power coils. When you find voltage on a coil than related mosfet/drmos is shorted.
Excellent solution. BTW Sorin you can forget about your morning coffees, it is more than enough if you mantra that "short finder" thing a few times and and it will rises up your blood pressure immediately, more than any caffeine. :D
Absolutely right people wants easy ways without knowing that sometimes its not correct. Something that boils my blood when I see some people wanting to teach in some youtube channels but they don't have it right . They think they do but at the end with what you learned you know they are not right .
Really it's a good video for all basic to advanced learners he was an electronic genius brain trying to get at least 5to10℅of his skills and knowledge tq very much sir for sharing a good learning video
@West Senkovec: Simple man? Of the "old school"? Please, West, can you do me the big favor of putting me on your list, because of course I belong to that "select group" too. First BIOS? lol... you're terrible (in Spanish they would say about you unbearable guy!😊) All the best. A brotherly greeting from Mexico.
Hi Sorin thank you very much for this video. I in the laboratory source Koraxxx 30V - 10A, I can limit the current or voltage but when it reaches that limit it is blocked and you have to be pressing to unlock, and I do not just see how to test the capacitor shorts, and I also observe that depending on the type of cables you use for its thickness can give one value or another.
First of all congratulations for your great RUclips channel! I would like to ask if while injecting voltage into the circuit to find the short circuit a positive voltage could be applied to the ground rails of the motherboard and the zero voltage at probe pin. Thanks!
I have a weird laptop issue where it will power on briefly and go off (shows screen briefly with logo). So fairly sure good CPU+GPU. Without memory it will stay on but no picture, with fan spin. I tried for several hours to locate the short, even with thermal camera it was not showing, with most IC's and temperatures around 30-50c. Voltage gets around the entire board with the memory out (19v, 5v, 3.3v) and the board powered on. I've been hesitant to try voltage injection to find this short. I'm going to try this method when I have time to try again. I have watched probably 3-4+ hours of your videos the last few days to get some ideas, this one shows the most promise! Thank you again for your amazing work! Also, yes, there is a whole bank of caps shorted in parallel which makes this one hard to find.
I repaired a shorted mosfet using "a sorin style" now the problem was when the customer asked me what I had put..... Sorin fuse🤣🤣🤣 and it worked nonstop ...but am hoping to replace that mosfet after some time coz the customer was in a hurry
i'm trying to repair a monitor power suply and your videos are realy helpful; i'm suspecting a 3055 mosfet short thanks a lot, now you have a new subscriber good luck p.s.- your accent seems like romanian :)
I Weldone Mr Sorib u are doing a very great job.... I am a beginner...pls where did u put the black probe of the power supply when u were looking for the shorted capacitor after shorting it itself?
On most rails, you can do that with just a multimeter. Check resistance from the shorted rail to each suspected rail and whichever one has the lowest resistance is the problem. That doesn't let you find which mosfet is shorted on a 16 phase gpu, though. At least 5 will be in parallel. When your method would be particularly helpful is with something like a 3090 where the core resistance is 0.1 ohms and you can't tell the difference on the multimeter. The core will naturally draw around 2 amps, so with the shorting method, it will draw more current and hopefully let you feel the heat on the shorted mosfet with your finger, or possibly allow the trace resistance to make a slight difference in current draw. That way when you short right at the shorted mosfet, it would draw more current than when you short at the other mosfet. That's just a guess, though. For shorts that are still above 20 or 30 ohms and not the VRAM rail, it wouldn't work, because it is likely a slight short to ground and there isn't enough current to affect any readings at all.
I feel like I also need some sort of diagram to explain it. I don't think I'm stupid, I just understand better when there is a clear diagram of what's happening. :)
Sorry I had written in Ita. You are the best, I have learned more from you than from anyone else...! Am I mistaken or is this called the Kelvin method?
Sorry for the late thumbs up on the rules and yes i have heard of these SF SK and the first thing that came to mind was don't buy it it'll short the whole motherboard LOL so yeah never bought one and never will thank you for all the videos i have learned a lot from you.
For those who ask how....lets suppose that he shorted. Fet for boost cirxuit..now the coil is between shorted fet and power supply.....if u short before the coil the short will be more direct......as he clevery apply0.1. Small voltage and half amp.....the smps has happit of sacrificing the volt to let amp going....and with very small voltage he creates tool that have high sensitivity to ohm slightest fluctuation ..the dc voltage of 0.1 have the eye of sauron to the skiiping of coil resistance and applying more direct short.....this smps feature called cc cv ....constatnt current constant volt
Last time i fixed a dead PSU and i see sometimes that parts not always dead short or open line, sometimes there may be malfunctions due to leaks of current or low ohms in circuits that do not have any short circuits or open circuits. --The capacitors may be leaking, in this case they should be replaced with their equivalents. --There may be Cold Solder in the circuit structure and this is one of the most common problems I encounter. It is also invisible. --There may be a problem with the Bridge diode on the ground floor. It may leak. --Mosfet transistors at the input stage may have completed their life. If these have dropped below 450 ohms, they should be replaced. Shottky diodes may have decreased ohm at the -12v level.. --12v IC Controller in this region may be faulty. TL431 transistors in the 12v stage may be faulty. --The Zener diode ohm transitions to the IC controller may be more or less than the default. I can count many more like this... dont always try to find dead short, it can be partial or lower ohm.
Good video, I am a newbie, could you explain in more detail on time line 2:51 we have GPU, where are you touching the probes. Sorry if you explain this in other videos that I may have missed. I think some things are so simple to you, and you may think everyone knows the simple things and you take it for granted, and not go into detail. Thank you
Sorry for my stupid question, all the msofet are the same? can i replace any mosfet with any mosfet? for example change a pc mosfet by a lapttop mosfet?
I have a problem with my laptop, the power light and the battery light is blinking and the laptop fails to charge at 80 % battery life.. but sometimes it does not blink, and can charge
![Felix "Unfair" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/Oswujxm2Ag0/mqdefault.jpg)
Hi Sorin! Totally agree with your methods in this video. But I have important addition! Like with GPU, when you have several phases in parallel you cant point exactly which mosfet is shorted. But there is a way! If the power from your power supply going through dead mosfet its also going through its coil! So you can take multimeter and measure voltage across coils and find exactly which one is under load right now! See, very simple! No need for thermal camera and no need to push high current, even 0.1A is enough to detect short circuit this way.
Works best if you set the multimeter in the mV range
You mean that only at the coil of the dead mosfet you 'll measure voltage more than 0V?
Where should the power suppply be connected? At the power jack?
Could you Expalin a bit more?
@@dimitrismaster explain more please
@@laptopguy2230 The voltage might be low to read in the normal volt range.
@@pgsss6354 Yes, you will measure more than 0V on a coil connected to the dead mosfet. Power must be connected to the shorted circuit directly. If its 19V power rail you can connect to it.
This man is ablolutetely best in electronics repair.. A genious of epic proportions. I have followed him for years.
I have been following you for a long time and you are a great teacher and have interesting videos. Please ignore the negative comments and be sure that most people think only the best about you. I learned a lot from you and I'm still learning and it means a lot to me to look at some of your work at least one day. Thank you for that and greetings from Germany 😊
've been following electronic channels for a long time, I haven't come across such an exciting course in a long time. You showed us a method that is far from modern tools. That's the old school rocks over the tool-mania. Thank you Professor.👏
You did an amazing job Mr. Sorin.
I always use coils to detect the short circuit, without a thermal camera or voltage injector, because the coils can never be connected to the ground, and that method that you used can lead to the exact place where the shorted component exists not just the MOSFET but any component that can cause a short to the ground like a capacitor, diode or IC.
Note :
When you short the two coils Next to GPU to the ground the voltage drops to 0.1 volts because that's coils are connected to the same power rail (+VCC GFX), because generally the CPU and GPU can have two power channels or more, and all that channels are connected to the same power rail (+VCC_Core or +VCC_GFX).
Nicely done keep going.
Yes, if you have shorted main power you can put some very low load to it and check voltage across every coil to find exactly which one is under load right now. Easy way to find which component is shorted in that part of circuit. No need for thermal camera, no risk to burn anything.
@@Evhen_Velikiy Right👌
Its Amazing to see Electronics Repair Basics_ERB comment. By the i'm also a faithful follower of your channel. Electronics Repair Basics_ERB, Electronics Repair School and AdamantIT are the best you tube channels that have taught me alot in these repairs. So seeing you here really uplifts my spirit. I love the solidarity.
I’m a complete NOOB, so please bear with me. When you say: “coils are never connected to ground” is that the same thing as saying that, they are always connected, in series? Did I get that right? Please let me know. Thank you kindly
@@maxwarfield6699 You need to read the basics of how buck and boost converters work in order for you to understand what's going on as regards this topic. There, you will se yourself how these coils are connected per each case...It's not so easy to answer your question with a simple "yes" or "no"...
This only works properly if oyu have some short on a power lane. But some shorted resistor or diaode or capacitor on any other lane will be harder to find this way. Because you still have a lot of space where that specific short can be. But still this is a very good tip!
Hi, I am a beginner student of electronics and this video taught me very well. If you post such videos for beginners, we will learn more. It's great. Keep it up.
You're the man Sorin! You found what works for you and you share it with your members. You are very talented and have a big heart. Thank you for being you!
Thanks for another great lesson professor Sorin 😊
When I had just started watching the video I said to myself, "this is going to be interesting". So I made myself a cup of coffee and watched the rest. I was right it was interesting and informational. So now it has been saved and liked. Thanks Sorin for making this educational video.
The other day I was watching one of your old videos about finding a short and you explained more or less the same thing and some of the videos are about 5 years old. This has been going on for too long and the connoisseurs will always try to be better than the master and I have seen it on so many platforms😅. Quote from NF "You cannot stop the world from complaining" and you cannot make them "better than factory"😂 ..We must remember it is part and parcel of the world going around at the speed of 30 kilometers per second in orbit around our Sun😅 Thank you Sorin for this wonderful lesson.
try to never let people trigger you. happens every day, keep the good thing going my friend, im learning from you. thanks
Thank you so much Sorin. I already do a lot of motherboard repairs. This has helped me find a short circuit on a rtx3090. ( which i could not work out due to no proper heat signal) agree with you. Those things that shall not be mentioned are a waste of money!
Someone was looking for a short finder but instead found Sorin's short fuse :D hahaha love it, and great info on using the power supply.
This is one of the most versed videos made for this matter, Sorin. Thank you! 🤗 Although probably the title should say “CC/CV power supply required”, it's fine. Excellently well explained.
Concerning what you say about a “short killer”, which is something you mention hearing somewhere (Discord), and that it “triggers” you because somehow you find people using it incorrectly (“blood boils” and “insane”, you say): I know this well, Sorin, I know. It has to do with mind programming, and these things which you find @#$% are actually triggering something in you, and you react. The trigger most likely has to do with a negative mind program which you need to give up from or transmute (with the assistance of a good mind reprogramming healer if you can't by yourself) or at the very least you must learn to disable the trigger in you, so it no longer triggers you or it stops having a negative effect on you. I know this well, Sorin, and unless they are really willing to learn you cannot stop dumbass people from being dumbass; it's them who must change themselves.
Thanks again. 🤗
Nice, sweet, and to the point! I’ve been following you for a while and I find your instructions very informative! Thank you for what you do!!!
Thank you for showing a simple, safe and practical method to locate shorted MOSFETs and capacitors using only a good power supply.
In several places in the video, you read the voltage as 'zero point zero nine', 'zero point zero five', 'zero point zero one', etc instead of saying 'zero point nine', 'zero point five' and 'zero point one'.
It will be nice if you can repost the video showing the corrections in text.
Thank you so much sir for the great explanation, i wish to ask how can i find the short if I don't have the machine that will low the voltage
The first important Tool is the Brain and know what are you doing. Sorin you are a great asset to us . Thank you 👍
The Genius Sorin. Love your methods ❤ This can be only from experience and a gifted mind for electronics
Thanks for the info Sorin.
You don't need thermal camera, alcohol, multimeter, or burnt fingers, just your brain and power supply.
Smarter than smart.
Thank You for this video, one of the best ! I think it will refresh brain even for experienced in repair, sometimes need to think simply logical but our heads is full and brain tricking us to look more complicated
You can use an alternative option for finding shorted mosfet.
You can test every single mosfets existed on motherboard with diode test and you can just check the impedance between gate and source. And that's it and if one a mosfet which has a low impedance between gate and source , you will be 100 percent sure that the mosfet is shorted. I think this is the best and fastest way to find a shorted mosfet.
I agree. But you need a multimeter. This method is safer than to insert voltage for those that are relative new to this.
You cant be sure that mosfet is faulty every time you have a short. Thats why its not practical to test every time all of mosfets.
@@Evhen_Velikiyyeah i agree. In some cases if the resistance between gate and source of a mosfet is low but not completely zero , we can be suspected that the pwm ic which is related to the mosfet is faulty , but if this resistance is completely near to zero , we can be sure that the mosfet is definitely faulty.
@@Drottninggatan2017 exactly👌
@@armanesmaeily7087 What if you have DRMOS'es on board? You cant measure source-gate coz there is no pin outside for gates. Only way to find shorted DRMOS is to supply some safe voltage to the shorted circuit and measure voltage across power coils. When you find voltage on a coil than related mosfet/drmos is shorted.
I have always just learnt a lot from your videos and techniques. Don't bother about other people's comments
Excellent solution. BTW Sorin you can forget about your morning coffees, it is more than enough if you mantra that "short finder" thing a few times and and it will rises up your blood pressure immediately, more than any caffeine. :D
Great content and advice. Thanks for sharing. Wish you and your family a wonderful Christmas
Greetings from Malaysia Sorin, it's 1am here. I should sleep but your video is the priority here😂
Sorin, you are the real deal! Thanks for the great video!
Brilliant!! Super brilliant! Changing the 6Omhs to 0ohms to check which MOSFET is shorted!
Absolutely right people wants easy ways without knowing that sometimes its not correct. Something that boils my blood when I see some people wanting to teach in some youtube channels but they don't have it right . They think they do but at the end with what you learned you know they are not right .
Hi Sorin. I am new to your channel. I am electrical/electronic engineer. Probably I'll start one day my channel as well. You are a legend by the way.
Really it's a good video for all basic to advanced learners he was an electronic genius brain trying to get at least 5to10℅of his skills and knowledge tq very much sir for sharing a good learning video
One of the greatest videos I've ever seen
Before taking the motherboard out, shouldn't we check the BIOS first?
@West Senkovec: Simple man? Of the "old school"? Please, West, can you do me the big favor of putting me on your list, because of course I belong to that "select group" too. First BIOS? lol... you're terrible (in Spanish they would say about you unbearable guy!😊) All the best. A brotherly greeting from Mexico.
Hi Sorin thank you very much for this video. I in the laboratory source Koraxxx 30V - 10A, I can limit the current or voltage but when it reaches that limit it is blocked and you have to be pressing to unlock, and I do not just see how to test the capacitor shorts, and I also observe that depending on the type of cables you use for its thickness can give one value or another.
First of all congratulations for your great RUclips channel!
I would like to ask if while injecting voltage into the circuit to find the short circuit a positive voltage could be applied to the ground rails of the motherboard and the zero voltage at probe pin. Thanks!
I have a weird laptop issue where it will power on briefly and go off (shows screen briefly with logo). So fairly sure good CPU+GPU. Without memory it will stay on but no picture, with fan spin. I tried for several hours to locate the short, even with thermal camera it was not showing, with most IC's and temperatures around 30-50c. Voltage gets around the entire board with the memory out (19v, 5v, 3.3v) and the board powered on. I've been hesitant to try voltage injection to find this short. I'm going to try this method when I have time to try again. I have watched probably 3-4+ hours of your videos the last few days to get some ideas, this one shows the most promise! Thank you again for your amazing work!
Also, yes, there is a whole bank of caps shorted in parallel which makes this one hard to find.
THE Best teacher Ever.
Great trick in finiding shorted mosfet or capacitor, Which is the name/ model of power suppoly you use ?
I repaired a shorted mosfet using "a sorin style" now the problem was when the customer asked me what I had put..... Sorin fuse🤣🤣🤣 and it worked nonstop ...but am hoping to replace that mosfet after some time coz the customer was in a hurry
Thank for new idea sir Sorin
phillipines here 😊
i'm trying to repair a monitor power suply and your videos are realy helpful; i'm suspecting a 3055 mosfet short
thanks a lot, now you have a new subscriber
good luck
p.s.- your accent seems like romanian :)
I Weldone Mr Sorib u are doing a very great job.... I am a beginner...pls where did u put the black probe of the power supply when u were looking for the shorted capacitor after shorting it itself?
So what ppl cal u by names.u r doing a good job .. free education for all.. good job indeed. God bless u nd ur family.
I LIKE YOUR WAY OF PRESENTATION AND TOOLS WITCH YOU USE PLZ MAKE ONE VIDEO ON LAB TOOLS
I love the alcohol spraybottle technique. repaired my first mainboard that way.
Great video! Saving it for future use! Thank you!
Simple and powerful example of how experience trumps toys - nice one
what an idea sir ,i think knowledge is wisdom after your video, still i have to learn i think videos like this ,thank you so much sir
I have learned so much from you.
Keep up the good work :)
thank you very much for sharing your knowledge and greetings from El Salvador in Central America
On most rails, you can do that with just a multimeter. Check resistance from the shorted rail to each suspected rail and whichever one has the lowest resistance is the problem. That doesn't let you find which mosfet is shorted on a 16 phase gpu, though. At least 5 will be in parallel.
When your method would be particularly helpful is with something like a 3090 where the core resistance is 0.1 ohms and you can't tell the difference on the multimeter. The core will naturally draw around 2 amps, so with the shorting method, it will draw more current and hopefully let you feel the heat on the shorted mosfet with your finger, or possibly allow the trace resistance to make a slight difference in current draw. That way when you short right at the shorted mosfet, it would draw more current than when you short at the other mosfet. That's just a guess, though.
For shorts that are still above 20 or 30 ohms and not the VRAM rail, it wouldn't work, because it is likely a slight short to ground and there isn't enough current to affect any readings at all.
what a handful 🙄
@@edwinjuma4404 what do you mean?
Very good video, it would have been even better had you also drawn a part of schematics and showed which point actually got shorted to the ground.
people in Sorin's league generally don't need schematics
I feel like I also need some sort of diagram to explain it. I don't think I'm stupid, I just understand better when there is a clear diagram of what's happening. :)
@@daffyduk77 people watching Sorin are not in his league.
@@pgsss6354 Don't generalise lol I'm just here for the entertainment 🙂
@@daffyduk77 ...but, some of them, think they are
Very helpful! Thank you Sorin. Wish I saw this video earlier. Make more videos like this one
Sorry I had written in Ita. You are the best, I have learned more from you than from anyone else...! Am I mistaken or is this called the Kelvin method?
I appreciate your work, I wish you a lot more to learn from you. Stay healthy.❤❤❤❤❤❤❤
What's the use of "tool" if you don't know what are you doing, if you don't understand basic concepts. Sorin is damn right.
Sorry for the late thumbs up on the rules and yes i have heard of these SF SK and the first thing that came to mind was don't buy it it'll short the whole motherboard LOL so yeah never bought one and never will thank you for all the videos i have learned a lot from you.
but without short on coil, you must have 10v on coil with the multimeter...
Anyway, you are a gentleman of electronics !
Thanks Sorin this is a nice approach to find a shorted mosfet
thank you boss, this is my first time to comment. you my mentor in electronics
For those who ask how....lets suppose that he shorted. Fet for boost cirxuit..now the coil is between shorted fet and power supply.....if u short before the coil the short will be more direct......as he clevery apply0.1. Small voltage and half amp.....the smps has happit of sacrificing the volt to let amp going....and with very small voltage he creates tool that have high sensitivity to ohm slightest fluctuation ..the dc voltage of 0.1 have the eye of sauron to the skiiping of coil resistance and applying more direct short.....this smps feature called cc cv ....constatnt current constant volt
Recently found your channel. Love you already :) Thanks man.
Hello I think like you, but some short killers has 20V 20A that's a good point to take in care.
Excelente video...Short Killer es usado con aparente éxito para levantar cortos en las pantallas LCD....
Last time i fixed a dead PSU and i see sometimes that parts not always dead short or open line, sometimes there may be malfunctions due to leaks of current or low ohms in circuits that do not have any short circuits or open circuits.
--The capacitors may be leaking, in this case they should be replaced with their equivalents.
--There may be Cold Solder in the circuit structure and this is one of the most common problems I encounter. It is also invisible.
--There may be a problem with the Bridge diode on the ground floor. It may leak.
--Mosfet transistors at the input stage may have completed their life. If these have dropped below 450 ohms, they should be replaced.
Shottky diodes may have decreased ohm at the -12v level..
--12v IC Controller in this region may be faulty.
TL431 transistors in the 12v stage may be faulty.
--The Zener diode ohm transitions to the IC controller may be more or less than the default.
I can count many more like this... dont always try to find dead short, it can be partial or lower ohm.
TL431 is not a transistor.
He was just talking about shorted mosfet in a computer mainboard which they were designed with similar way and happened very commonly.
Thank you for sharing this technique. Watching from Perth western Australia.
Nice video, I'm from Brazil and I understated you very well , good job! Thanks for share.
Ha ha, Now I see some use for one old powersupply I made in early -80s, max 30v and max 1A. Thank you Sorin the Wizzard
Good video, I am a newbie, could you explain in more detail on time line 2:51 we have GPU, where are you touching the probes. Sorry if you explain this in other videos that I may have missed. I think some things are so simple to you, and you may think everyone knows the simple things and you take it for granted, and not go into detail. Thank you
Sei il migliore, ho imparato più da te che da chiunque altro...! Mi sbaglio o questo si chiama metodo Kelvin?
Sorin you are absolutely great. I wish I can meet you one day.. U r legend .. Thank you for teaching us something new..
How do I know where to place the positive wire?😮
*Sorin Best of the best!*
How do you know which side of the coil to short?
doesn't matter which side of the coil
Thank you! Is there a way to test the motherboard with the charger cable if I dont have a dc power supply?
Excelente seus vídeos, estou aqui no Brasil aprendendo muito com eles.
Ok I understand how to find a short but how do you find out what exact components is bad
this is a lesson when you have to know OHM s law on another level. that law is so simple and still need so many years to fully understand it.
Thank you for showing ur skills very appreciated
you never stop surprising us. WOW
Good advice. It is new lesson for me. Thanks man..😊
Are you able to check in any log files to check what the correct pin was afterwards?
This video i liked the most . Thanks a lot for the efforts.
great methode to find shorts! big thanks to the guy, who left this commend few days ago!^^
Sorry for my stupid question, all the msofet are the same? can i replace any mosfet with any mosfet? for example change a pc mosfet by a lapttop mosfet?
Sorin's brain makes clicking noises, must mean he is internally short circuiting.
Great Job! I will learn to use this method. Thank you.
excellent teacher ive learned a lot today
Learned something every time
Thanks
Great video! And also a good lesson for ohm law 🙂
I tried the same way and I found that mosfet are dead :) this is very simple way to find a mosfet
I have a problem with my laptop, the power light and the battery light is blinking and the laptop fails to charge at 80 % battery life.. but sometimes it does not blink, and can charge
Hello, at 05:44, you shorted a mosfet to ground and the voltage went to 0.1V, even though it wasn't the mosfet you shorted, how could that be ?
Both coils are soldered together, so shorting the first one or the second, is the same thing
@@electronicsrepairschool Thanks for your reply :)
Awesome video. I learned so much as usual.
Ypu are one of the best my dear Sorin ...God always bless you.
Good stuff Sorin! Well done.
OMG Sorin why you not tell us this 5 years ago? 😂😂😂
"If you have a short killer or a short finder.... don't say it" lol :D hahahaha too funny thank you for the video
wow! just wow, the lesson is well understood, thank you very much.