The Most Common Mistake in Laptop Repairs The shorted mosfet myth - Testing mosfets

[katbutnohat_]

I'm brand new to laptop repair and you've probably just saved me (and many others) hours of effort, not to mention a few quid on mosfets I didn't need.
These recent videos are brilliant mate, thanks for helping us raise the bar, keeping more devices out of landfill.

[zmagomah]

Everything is logical and understandable in Sorin's explanation. With great respect and greetings from Slovenia.

[tunkunrunk]

I started learning electronics last year, because I wanted to start fixing faulty computers . I was eager to learn everything about electronic components, how they worked and how to find when they were faulty . And there went the magic word " shorted" 🙂, you could fix anything as long as you could find shorted capacitor or mosfet . And there I went, finding shorts in motherboards . But I quickly started to question this method of "shorts" detection

[jopac]

Wow, i am beginner, and these are exact steps i made when i thought i found a shorted line, or mosfet. Later on i fried the mainboard in trying to start it. How smart that you realise what would a beginner do... Thanks for the explanation

[カエル王子-rg]

Last few videos are astonishingly informavive. Thank you for your easy explanation based on biginners' point of view with a schematic. Understanding how each type of compornents should behave is essential in repairing electronics.

[zefdin]

Great video, very patient and well executed. I graduated electronics school 30years ago but I no longer work in the industry. I miss the hands on technical nature very much. You are making me nostalgic. Cheers!

[Infiniti]

I’ve seen another channel using a milliohm meter to check for variations on resistance on low resistance power lines like CPU vCore power phases.
I’ve also seen people call out a short just because their multimeter beeps in diode mode.
It will beep when the reading is between 0-40 (sometimes 0 - 60) on the screen.

[onopalaver]

Thanks for the declaration 👍 Especially the quite low resistance. Even if I know about the rules in calculating the current, I forgot, how low the resistance must be in low voltages.

[FAer]

You should be teaching real world electronics at a major university: you´re -by far- the most clear person teaching even the basics. Congratulations, again.

[frankinga]

"Discord" means disagreement. "Discourse" means to discuss. Keep up the excellent videos.

[boudrass]

impressive info thanks sorin you are really know what you are doing, for me if i suspect in a mosfet i discharged it first, for CPU GPU circut ever 2ohms is a normal resistance .

[kokodin]

the day i learned this mosfet magic was 15 years ago or so when i was trying to diagnose shorted pentium 4 motherboard from a school computer
and the fault was complicated because it was actually shorting mosfets in pairs on 12V rail that power cpu
i broke like 8 mosfets before i came to conclusion that it isn't that, asked online for help and i was told to look for mosfet controller. i replaced that part for random part from other broken motherboard the pinout was the same and the function describtion for the chip so i swaped it, 4 new mosfets and... the board worked wierdly different than identical ones, but it works even today
with many mosfets and mosfet driver soldered like a total amateur did that with no hot air, no proper soldering iron.
but i fully admit i would be lost without help from kind people

[Electronics_Repair_NZ]

I love your new look and style, very happy and professional :)

[djtoland]

If you have two soldering irons available, the best way to find a shorted mosfet is to remove the inductors, which isolates the mosfets. Then you can check them individually, check each from the 12V input to each drain of each mosfet, and check from each drain to ground.

[adamsix]

I can't wait to trigger a mosfet by rubbing a screwdriver in my hair 😃. Thank you for the video, great content!

[bertgeorge]

An object lesson in the pitfalls of fault finding in a non-live situation. I learned the equivalent lesson with thermionic valve technology fifty years ago and the principles still hold true - you can' t rely on measurements if the circuit isn't under load.

[aalhout]

Thanks alot for your time and effort to transfer your knowledge and experience 🌹🌹

[pdxbmwfan]

Folks are misled about this after having watched repair videos of a known YouTuber who allegedly succeeds in repairing expensive GPUs and motherboards using the same technique of simply testing what MOSFET beep in continuity mode then replacing them. I won't give names, but you all probably know who I'm referring to. I'm starting to think those devices he shows on camera probably never got fixed that way and I would take anything he shows with a grain of salt. Thank you Sorin for this insight. I felt into the very same trap myself.

[Geumgeum]

Hi Prof, very happy for yor courses, i'm in Sénégal and It's very interesting

[CrucialSpeaks]

LEARN STUFF - If I can do it, MAYBE you can do it too! YOU HAVE A GREAT TEACHER HERE!