Everything You Should Know About Voltage Injection

Everything You Should Know About Voltage Injection - LFC

Рет қаралды 80,811

Күн бұрын

One more thing of note, while this video covers text-book cases, keep in mind that there are always many edge-cases. Some more modern GPUs can read less than 1ohm at vcore, so great care should be taken to make sure a less than 1ohm short on the main rail isn't the same as the less than 1ohm of resistance through GPU vcore. Likewise, you can also have partial shorts, where a capacitor or even a fuse can be shorted, but still offer some resistance.
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Chapters:
00:00 - Intro, What is Injection
03:21 - What is a "Short", How We Measure It
07:58 - Low Resistance Circuits
10:00 - Equipment & Setup
16:06 - Assessing a Laptop
25:05 - Preparing for Injection
30:48 - Looking for the Hot Spot
36:01 - Removal & Replacement
41:55 - Testing & Conclusion

Пікірлер: 354

@Adamant_IT Жыл бұрын

@Mikie1959 Жыл бұрын

Graham you would be one hell of a tech teacher you explain everything so plain and simple so everybody understands what you are saying .

@Bartosh.S Жыл бұрын

He IS one hell of a tech teacher.

@DMP413 Жыл бұрын

My thought exactly. What do you think he is doing...teaching

@Mikie1959 Жыл бұрын

@@DMP413 he is basically teaching us on youtue but he could be a great professor at a tech college he explains everything in simple terms anybody could understand .

@mrBDeye 9 ай бұрын

He is one “heaven” of a tech teacher.

@NerdThingsAndMore 2 ай бұрын

This is the best video explanation I have found on KZfaq Thank you!

@Ballyanden1 Жыл бұрын

Thanks Graham, there are a few you tubers that go strait to voltage injection - they probably get it wrong a few times and call it a no fix and say better than factory when they have actually broken a fixable device 😀 I really like this logical approach. I prefer to take my time and get it right than rush in to save time. Many thanks for the videos 👍

@fredrickrari9338 Жыл бұрын

I think I know who you are talking about😂 its never a fun thing to see an item being dismissed because its not worth the time or voltage injection wasnot done correctly

@khlua4590 9 ай бұрын

the bridge

@rickpontificates3406 3 ай бұрын

It is good to use a current limited supply, but if you stay under the rated voltage of a circuit, YOU WILL NOT fry good components because if they're not shorted, they'll only draw what they need

@Ghost572 Жыл бұрын

Those old methods do still hold their wieght in the sense that if your thermal camera ever broke you have backup options. Also I saw on northridge fixes channel he was trying to sell these voltage injectors but I was wondering what the hell is he going on about, he said he broke a channel on his power supply (not sure how someone that experienced didn't use a current limit) and that somehow a power supply isn't designed for voltage injection (like what??). That's exactly what a power supply does, it supplies (or injects) voltage,current and energy into a board. It's like every video he's trying to sell you something or even better guilt trip you into buying his stuff.

@usmanwiyfengla8019 19 күн бұрын

best Tutorial ever. Thank you Master. You make life easy and better for us in Cameroon and Africa atlarge with expirience and almost no teacher to help young people like us grow in this field. and grace and wisdom to all what you do

@jonathaningram4672 Жыл бұрын

Also ALWAYS cross the probes and set voltage/amps before linking up to add power injection as some bench power supplies spike before stabilizing to set voltage

@jstro-hobbytech Жыл бұрын

Especially if using an smps. It drives me nuts that you have to intentionally put so much strain on your bench supply because they're too cheap to add the ability to current limit another way. My wife got me a 3 output siglent for Xmas (which blew my mind) but it's spoiled me for setting current limit at the touch of a button. I have a longwei and kaiweets pair that are virtually identical except for paint color. I paid a fortune for the longwei and now it's less than half price. Kaiweets sent me the other for free out of the blue with an email (I signed up on their site because of discounts as I've given their dmms away as gifts) then demanded a review. Haha sure I told them. I was gonna start a channel this month for a local club I'm involved in but decided not to. But they sent this over a year ago. Weird ehh. I heard they did it to others as well. Someone gave me their ht208d clamp meter as a gift and it's one of my favorite meters and probably the most expensive one they sell. I have a fluke clamp that was twice as expensive with half the features and zero input protection on the probes. I've since donated the fluke as I believe they are not worth the money with brands like brymen making more feature rich meters at half the price. Sorry for windbagging. Europeans are spoiled for choice when it comes to brymen. I had to order mine from Germany to Canada from welectron on ebay. I'll never buy a thing from welectron again. Their service is horrible. Stereotypical Germans as described by marco reps lol. Wouldn't except a promo code I had and wouldn't honor the warranty after 1 month.

@Dutch-linux Жыл бұрын

best to use is a low ohm's meter that has a range from 2 ohm to 0 ohms .. they are expensive but super accurate for short finding

@redmist4963 Жыл бұрын

Just a multimeter with 1 mohm resolution would do the trick. They are mostly found in bench multimeters but you could also use 10 mohm res.

@Dutch-linux Жыл бұрын

Very educative video you should make more like these really liked this one thanks

@Adamant_IT Жыл бұрын

Yup, I'm planning on doing a brand new Board Repair Basics series to replace my old tutorial videos that aren't super relevant to modern systems, and from a time where I had significantly less experience.

@abdulazimpatel8467 Жыл бұрын

Please do.

@carloazuararuiz1069 Жыл бұрын

@@Adamant_IT I would love for you to start with Dell (your favorite brand and mine too). All the best.

@darrenmurphy6251 Жыл бұрын

Respect for showing an ambiguous board most you tubers specially select the clear easy faults and create an artificial idea that what we do is easy and decisive

@jameysummers1577 2 ай бұрын

Again....This is the ONLY video that explains this. Everyother video just shows someone injecting voltage, something glows, they replace it and look like a God.

@nivanthafernando5189 Жыл бұрын

Bro, this is one of the great demonstration and explanation by anyone can do their best. I respect your afford taking to share your Knowlege with learners. Hopefully you will be blessed to bring more videos like this in future.

@m-elokkichawki9694 Жыл бұрын

i had the same idea but still a very usefull channel

@michaelmitchell8218 Жыл бұрын

Just watched this video, I do electronics and repair many laptops and I see so many videos of rubbish fixing laptops,PS5,Xbox,Tv, etc and I got to say this is one of the first videos I seen where this guy knows what he is doing and talking about. I give this a full thumbs up and should be more of this. Be careful people because there is so much rubbish on you tube and if you know nothing about electronics then don’t even try to fix anything, go on a electronics course. I been fixing electronics for over 30years and there is always new things to learn. Anyway love your video and fantastic work my friend.

@Adamant_IT Жыл бұрын

A lot of KZfaqrs including myself kinda learned as they went, making videos while they were figuring stuff out. I'm trying to correct my old works now. This video and other ones I have planned I'm running past a couple of veterans on the repair scene and saying "You have the knowledge, I have the audience - is this accurate? is this portraying the information that you guys want people to be learning?"

@carloazuararuiz1069 Жыл бұрын

@@Adamant_IT 2 veterans of a thousand battles as technical support behind you? It had taken a long time young Graham... excellent decision. That will increase your subscribers. All the best.

@thomaskyalo7753 Жыл бұрын

I was waiting for this coz power injection is a very sensitive area especially on the WHERE to push the amps. Thank you Graham

@LarixusSnydes Жыл бұрын

I like my DMM that also *shows* the resistance measured when in continuity mode, so, if I hear a beep, I can just look at the screen and find the resistance measured and inspect closer *if* it's a dead short or not. Props for not jump-cutting to the moment that it eventually powers up. That helps keep things realistic.

@mats-olovrikardsson1249 Жыл бұрын

Thanks Graham, very good video. In the 70s we called it the Indian method when troubleshooting radio and television. We checked where the smoke was coming from. 😉 Can't recommend it today. A bit too expensive. Thanks for all the videos you share. 🙂

@robertjung8929 Жыл бұрын

actually all electronics is running on smoke. when the smoke escapes it stops working :)

@nickwhite4632 Жыл бұрын

Your space makes my space look tidy. I pointed it out to my wife to show her that’s how tech spaces just end up looking. 😂

@lizzmk 2 ай бұрын

This is what I’ve been looking for how, when and where to inject 👍 you’ve explain it clearly

@ImranOO7 Жыл бұрын

As always, great content and really enjoy and look forward to your videos. Keep up the good work and my deepest regards

@keiths8700 Жыл бұрын

Another great video Graham! Thanks for the 10 out of 10 explanation and awesome video work!!

@robertisaacs5122 Жыл бұрын

Great Video and good explanations. Thanks for taking the time to make this.

@priekabos22 Жыл бұрын

totally respect you!!! so clear and strait explained, probably the only video ever who made so well! you are legend man

@Retroornew Жыл бұрын

Great Video and perfect explanantion from start to finish including the tools and equipment that you use Graham professional as always.

@bienhelado204 8 ай бұрын

I love your graphics and appreciate how much time it takes to include them in the video. You have a way of teaching that captures my full attention.

@gogee8510 Жыл бұрын

Great clear commentary on voltage injection. Love the video.

@NotThatGuyJD Жыл бұрын

Finally learning what voltage injection's definition is.

@DarrenSteele-mx3ks 6 ай бұрын

Hey, it's great to see your videos again I Thought you were gone! You were LFC? "let's fix computers"? Well, it's great to see you in action again and I will subscribe now. Cheers!

@sipansibabdreddknot5179 Жыл бұрын

i find it easy to listen to you and quite explanatory on the things that we should pay attention to so all my lingering question and maybe in the future repair i came backup with the reasoning behind to fix laptops faults or any other electronics, thanks alot!

@frankmormando3917 Жыл бұрын

Great great explanation, seriously! Tech teacher quality! I've been watching many electronic repair videos in the past 6 months and I gained a bunch of valuable information and I have a lot of electronics knowledge myself. Thank you

@cfq.tufanuf7601 Жыл бұрын

Great video Graham!! Well needed as lots of people interested in voltage injection. Thanks

@robertobarros9946 6 ай бұрын

Really well explained and helpful. Appreciate the effort in making this. Cheers

@joseph_donovan 4 ай бұрын

Love your methodical and analytical approach to diagnosing, troubleshooting and fixing a short circuit. This video is packed with nuggets of good and safe practice. Thank you!

@clarovillarta7983 Жыл бұрын

Awesome!Thank you graham for explaining the gray areas on volatage injection in finding short caps (dead short) Thanks

@cristianleon7533 11 ай бұрын

Just subscribed. I’ve been in this field for a couple years and I’m just getting into more advanced motherboard repair than basic soldering and this will probably help me out a lot. Thank you so much, looking forward to watching more of your videos.

@woollysoxx Жыл бұрын

Super video! Great information, I always learn from your tutorials.

@hinny2005 3 ай бұрын

I did my first voltage injection yesterday. I think I was injecting directly into a ground plane at one point 😂 I started at 1v made sure the GPU or cpu didn’t get hot. Then cranked into up not sure what got a bit carried away and found a capacitor at 200c. Surprisingly found the short and old Alienware laptop fixed! So satisfying 😂

@reddot3893 13 күн бұрын

Very well explained, it'll try not to blow up my computer while injecting it thanks to your video

@hamradioop5777 Жыл бұрын

Thank you Graham, a thoroughly enjoyable and educational experience. I've watched dozens of professional repair videos and yours has been the only one to provide very necessary learnings,😇 before I blow-up something by being too gung-ho.

@colinreece3452 Жыл бұрын

Thank you Graham, as a complete novic one of my main problems is knowing ho to set the multimeter to what? I'm being honest, not got a clue so I leave well alone. This made me think to what you said earlier setting it wrong could lead to a big mistake. When I've watched other say I set the meter to XXX mode they should show it on the multimeter where the dial is pointing to.

@Adamant_IT Жыл бұрын

I was going to move to an on-screen multimeter, but I decided to go with a camera-pointing-at-meter setup for this exact reason. I'm still fine tuning the camera angle, but the objective is for people to be able to see that I'm using an ordinary cheap meter, and where the dial is set at any given time.

@electronicrepairservice2020 Жыл бұрын

An excellent explanation/lesson. 👍Thank you for taking the time to make this informative video!

@lallyji8051 Жыл бұрын

Amazing Video!!!! Best one explaining Shorts! God Bless you man

@ctrea91 Жыл бұрын

this is my favorite channel from now own.. very specific. good job for that

@ecurepair Жыл бұрын

Nice and well described! Your video's have gotten a lot better.

@tolgaaydin1981 Жыл бұрын

Thank you very much for sharing these tutorials and detailed repair videos. I am patiently waiting for your videos.

@MasterJediSean Жыл бұрын

Brilliant video my friend! I have watched this a couple times now and will review when needed. As you clearly explain the particulars. Thank you so much for this helpful. I like your teaching methods. More troubleshooting! Love it! Cheers Mate! from a friend in Surrey BC Canada.

@rpapp Жыл бұрын

Thank you for these videos! Everything is so clear and comprehensive.

@Jay-uw2eb Жыл бұрын

Great video, for those of us who actually understand the basics this was very well explained to get to the next steps 👍

@chrisamon5762 Жыл бұрын

Thanks for explaining the short to ground term!

@Synthmonkey Жыл бұрын

I work with sigma in-circuit test machines daily testing many different pcbs (which I know would be a very expensive way of doing what you do) but you have explained this perfectly. Nicely done and a really informative.

@HenriqueFerreira-lj9nj Жыл бұрын

Thanks for sharing your knowledge... Greatings from Portugal 🇵🇹 🌟

@vasyltokar4062 8 ай бұрын

This is gold for who is new in fixing boards. Cheers mate

@michelk1445 Жыл бұрын

Wow is this a really great video. Now i understand what a short to ground is en when it is right to insert voltage. Chapeaux 👍

@015diesel 5 ай бұрын

Love this channel! I've learned so much from you and would like to thank you very much for putting the ti e and effort into teaching us 👌

@gvenagas Жыл бұрын

Excellent explanation! Thank you for sharing your experience and knowledge!

@coopydan9906 Жыл бұрын

man I am so thankful for your superb advice. My Alienware 17 experienced this failure and I was able find the problem myself thanks to you. Love your work. Thankyou so much 🙏

@jonathaningram4672 Жыл бұрын

Top marks, must also know resistance from leads on multi meter before even starting. I understand low resistance and will beep but will not show dead short. Best explanation on this subject.

@cazi7244 Жыл бұрын

Great video and very well explained! Thank you!

@mehmetcakoglu866 Жыл бұрын

Excellent lesson! Thank you and cheers from Turkey :)

@johnd942 23 күн бұрын

Well done! A very informative presentation. I learned a few things. Thanks!

@saltcityrepairs5121 Жыл бұрын

This is definetely one of my favorite video. Very well explained. Very useful! Thank you for sharing. Exactly Correct as you mentioned. ❤

@Andrea-cz6go Жыл бұрын

Semplicemente MAGNIFICO! Hai fatto un video di cui avevo bisogno e che in Italia non fanno perché pensano che tutti sappiano.Bravo bravo bravo!

@nicolaslacoste9367 Жыл бұрын

Thanks a lot for your knowledge sharing. A lot of fix videos don't explain how to do a diagnostic but only to fix a common issue on a device. Thanks a lot for all yours videos. Best regards, Nicolas

@retrocomputinggrotto 9 ай бұрын

Very well explained. Between you and Sorin (if you know, you know) I'm going to learn lots from you.

@trainmaster0217 11 ай бұрын

Outstanding video!! Learned a lot.

@jameysummers1577 7 ай бұрын

This is the ONLY component diagnosing video that clearly explains what a short is and how to find one properly on a laptop motherboard. I'm not sure if you knew that, but this is a great video!

@zdkama 16 күн бұрын

Holy cow, what an excellent video. Thank you for your attention to detail, I learned an absolute ton. Subbed.

@MrLennymon 4 ай бұрын

Thank you, I was not even trying to learn anything tonight. I learned a lot which will help if i ever get to the point or desperate enough or I get that new thermo camera and a screwdriver . You made a nice video, I watched it straight through enjoyed every minute

@RayMondElec 11 ай бұрын

We need more teachers like you. Keep up the video's. They are greatly appreciated. Thank you

@manuelvillanueva3753 2 ай бұрын

Amazing... Cheers! Good and straight forward explanation...

@peterlorne7077 9 ай бұрын

Very good video. Thank you for not talking so fast! It means that those of us who are not very good at English can follow you. Thank you!!

@neilw392 Жыл бұрын

Great video Graham. Definitely cleared up a few things for me.

@irmadion4904 10 ай бұрын

Very well explained and incredibly helpful. Your are one the best teacher, I have seen ever....

@gabrieln5357 7 ай бұрын

Very well explained, m8! You certainly have the quality of a teacher. You should definitely pursue this career my friend! 10 stars from me.

@ErickMaxwell25632 Жыл бұрын

All my questions answered in this masterpiece. Thanks a lot.

@tonymamwell6333 Жыл бұрын

Awesome video. Clearly explained

@wartlme Жыл бұрын

Reading in Diode mode is helpful and sometimes gives you more info, especially if you check junctions.

@awaitingthetrumpetcall4529 Жыл бұрын

Important video. I'm glad I stumbled across it. Subscribed.

@ARI-og5ze 2 ай бұрын

Thank you so much what a lovely explaining I'm a beginner and after watching you for the first time I feel like i can fix things now 😂 thanks bro all love from Algeria ❤

@mountainsprings3303 2 ай бұрын

What a great tutorial. Excellent, thanks.

@Envy701 5 ай бұрын

Great video. Really good explanations on the do's and don'ts. You have a new subscriber. 😊

@DarkWhite1 7 ай бұрын

Thankyou, finally sombody explains it properly step-by-step.

@TechRIP Жыл бұрын

One of the best educational video's I have ever seen.

@transformateur9969 Жыл бұрын

Thank you so much, I love your videos!

@ebutuoytm7560 2 ай бұрын

Fantastic video. Thank you so much.

@MeitsMSX Жыл бұрын

Great video. Good to see you demonstrate the difference between mainrail and VRM resistances. If you ever get fed up with your thermal cam, try the Guide IR PC210 with a macro lens. It doesn't just see a faint glow of heath in a certain area, it sees the component being hot. And that for a fraction of the cost of a Flir.

@zyghom 8 ай бұрын

what an EXCELLENT job!

@nian60 Жыл бұрын

I didn't even know what voltage injection was. Thank you for the interesting video.

@BertisAU Жыл бұрын

Brilliant. Great video.

@ARFIXIT2022 Жыл бұрын

Thanks for sharing graham. as always☺

@TheBeeman410 Жыл бұрын

Good stuff Graham! 🍻

@jonathanmaybury5698 Жыл бұрын

Now, that was a useful and informative video.

@ableite Жыл бұрын

I needed this video 6 years ago...

@carlojoselitochua2954 5 ай бұрын

Done watching, thank you very much for the detailed troubleshooting procedure. I have learned significantly more troubleshooting & repair lessons in this tutorial video and to your other repair videos as well compared to my ENTIRE 4 YEARS OF COLLEGE EDUCATION. I hope you will soon have a mini-series for Schematic & Boardview-free Voltage/Power Rail Tracing[12V/18-20V Main Voltage Rail, 5V, 3.3V, CPU/GPU Core Voltage Rail, DRAM Voltage Rail, IGPU Voltage Rail, System Agent/Northbridge Voltage Rail, PCH Voltage Rail, BIOS Voltage Rail, Battery Power Rail], Proper method of testing/checking of potentially faulty MOSFETs & ICs/Controller Chips, CPU/GPU/PCH Reballing and BIOS Bin File Editing.

@adebayo22 Жыл бұрын

This is really a great tutorial. Thanks Graham i really appreciate

@mygmail29 9 ай бұрын

Thank you, thanks to this video I managed to repair my PC AIO which was completely dead using the inject voltage method. I set PSU at 1 volt and 2 amp and I got 1 hot capacitor just by using my bare hands. The location of the short capacitor is near the CPU. Previously I took this AIO PC to several service places. they suggested replacing the motherboard which cost more than half the price of the PC

@Netzphantom Жыл бұрын

love your videos. thank you!

@carlosgarciaoropeza5480 Жыл бұрын

(24:16 - 25:10) That's what I get for rejoicing in advance: I thought you had fixed the previous MoBo (LFC348) and I even watched each video twice to convince myself😟😔. However, thank you very much for sharing your knowledge, your experience and above all for your effort and mainly your time invested in the elaboration of this type of content exposed in a simple, clear and understandable way for many (novices and advanced) that reinforces our knowledge about this important topic. A sincere, affectionate greeting from Mexico.