Everything You Should Know About Voltage Injection - LFC#349

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

[Adamant_IT]

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.

[Mikie]

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

[NerdThingsAndMore]

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

[vasyltokar]

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

[Ballyanden]

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 👍

[sharymens]

Thank you so much for your time and effort in making these videos!

[mjhenry]

Working on a faulty board now, learning voltage reading, voltage injection and fault finding and i learn so much by failing!

Funny thing is... I watched this video before.. But watching it now makes me realize how much I didn't understand before. Thanks for what you do!

[michaelmitchell]

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.

[darrenmurphy]

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

[LarixusSnydes]

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.

[jameysummers]

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!

[Ghost]

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.

[nivanthafernando]

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.

[thomaskyalo]

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

[luiscornejo]

Before voltage injection, and if you have access to schematics like you did, you should also check whatever rail is shorted and what IC provides the power for that rail. Sometimes a rail is only supposed to be delivering for ex. 500mA. You can check this by the IC datasheet and the max current rating. If the issue is the driver IC providing power, there's no need to allow your power supply to supply 3A of current. Pulling 2-3A risks damaging downstream components that were fine to begin with

[peterlorne]

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!!

[jonathaningram]

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.

[tcrawford]

This video was very insightful. It has given me the confidence to troubleshoot a dead laptop I have been avoiding. Thanks!!

[hamradioop]

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.

[joseph_donovan]

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!