Sorin, I wanna thank you for your videos. Just yesterday I fixed two dead laptops using the knowledge I got from your videos. The feeling is crazy. I have been paying a lot to other technicians to fix laptops for me but now I can fix other problems on my own. Are you dodgey? I don't know. All I know is I am becoming a real technician by following your videos. Thank you.

The old-school method of repairing every electronic device. I love watching your videos. Greetings from ROMANIA to Mr. SORIN

watching this is surprisingly therapeutic :)

You make it look so easy to find that bad cap!!Same fault i was spend all day to find it!Thank you Master Sorin!

True, these old Dells a real pain to disassemble. In order to replace the fan on my e5430 the whole laptop had to come apart and the motherboard had to be removed.

Just repaired Asus ROG's battery "not charging", tnx for lessons from all these years that i learned of your tips. Best regards from Croatia !!

Mosfets are at the input of the laptop because the laptop has power internally, it might send current back into the charger if you don't block it. So when the switch is off, it blocks both current from the charger into the laptop and from the laptop into the charger. On a PC, MOSFETs help make up the VRM (voltage regulator module), which controls how much voltage other components on the motherboard, like the CPU or graphics card, receive. PC components like CPUs and graphics cards have strict operating voltages, so a motherboard’s VRM helps make sure this isn’t exceeded. MOSFETs are important to VRM functionality and have an impact on the amount of heat being generated by a VRM while it’s doing its job. MOSFETs can get quite toasty if you’re using a powerful graphics card, and a motherboard’s heatsink helps cool the MOSFETs and, thus, the VRM. In addition to keeping the overall system safe, keeping MOSFETs cool is also important for any type of overclocking. How Do They Work? MOSFETs are like switches that go on and off based on a signal from an integrated circuit (IC) called the PWM chip / controller. MOSFETs switch on and off quickly, allowing high current to flow through in short bursts. This, along with other parts of the VRM, controls voltage sent to other PC components on the motherboard.

Thank sorin..you are really a great teacher

Thank you teacher Sorin for another video!

Thanks for this video Sorin. Very interesting like usually

It's like when you go to the dentist and he takes out the wrong tooth! I can't stop laughing 😅😂🤣

Very good Sorin .Thanks

You are genius Sir ! I have the same issue in my laptop , thanks man

thenks professor.nice video.nice diferend diagnose .more like this please.

Regarding the screws, I normally use cheap plastic ice cube trays to keep them separate for each area.

Very informative video

Thank You Mr. Sorin,.my laptop Dell 6430 it's fixed now,.thank you very much my teacher. GBU

Wow, this is called expert who knows his stuff. I opened my laptop thinking I would put new thermopaste and make it faster. I used airblow duster to clean up the motherboard etc. I put back everything it doesnt turn on. Took it to mechanic and he said I liquid damaged the motherboard. Cost me $230 to get it repaired.

The screws on these models under the bottom access cover have a "P" on the chassis that tells you they have to be removed to remove the palmrest. Dell do make it easy in some ways. I love working on them.

Sir, it would be awesome if you deticate youre time to make a video about voltage injection tips and tricks, and what to avoid when using this technique.

well explained, amazing knowledge sharing, keep on going..

Good work. There is no sin using a thermal camera. The technology is there to be used. It saves me time but there have been times where it has run out of batteries and then I fix it manually.

Very nice, as usual

FLIR cameras are expensive if you don't need them very often, but you can modify a infra-red thermometer gun by gluing a short length of tube over the sensor to restriuct the angle of view, giving it more of a telescope effect. Then you scan the tube end over the board and susp[ect compnents while you watch the temperature display. Or, do like I did in my teens - use your forearm gently to see where the heat is (AFTER checking that nothing is 100 degrees C+ with your fingertips - you can see him do this around 15:30 and he jumps when he feels the hot one. A third way is to brush isopropy alcohol over the board and see where it evaporates fastest. - he does this at 16:40 using Zippo Lighter fluid Feed a few volts (current limited to maybe half an amp or so) into the power jack rather than use the laptop's PSU, becasue the laptop PSU will crowbar due to the fault remember. I prefer to use a lower voltage at first, then go to the full 19v or so if nothing smokes ;)

Super Video.Danke!

I love this show !!!

exellent work, thanks cap

Nice video & Thanks

Thanks for video. I would have some advice. if there is no thermal camera . you can use a check paper or flux. if there is a short circuit, at least 1v must be given there. because if there was one mosfet short circuit, not a capacitor on the motherboard, the 19 voltage you provided would go directly to the CPU or CPU or chipset line.

Nice video!

Very good!

You are the best, told ya before, 🙏

greetings from honduras master Sorin i like your video best of all i learn alot and dont even think on become a dentist

Well done

Good videos. Interesting to see the problem solving aproaches and thinking. I fell the fixes are sometime a bit too quick and dirty for me. Maybe good enough to allow data recovery but not best practice. I suspect removing capacitors will not be high on long term reliability. Then again even Dell's reputation in that area has become rather tarnished. Thanks for sharing.

Everyone saw the screw falling 😅

Very easy to fix

U r really great

Good day sir, it has been a wonderful moment watching all the videos of your computer repairs, you are really a genius in your work. Sir may I request for your e-mail

Thanks Mr. Sorin d=from Kurdistan keep it up

Ur a funny tec mate i ever seen on you tube dude i like ur videos

"It's like when you go to the dentist and he takes out the wrong tooth" hahaha i really love your videos...am learning alot thank you and may God bless you

great video Sorin yea the Dell laptops are prety easy to diagnose yea thermal cam is awesome got me one on ebay for 150 euro not to bad was a real good deal

@Electronics repair school Hello,your series is great! thanks for all that awesome info, on my E6430 my internal microphone jack is broken by inserting a microphone in a unlucky angle, the think is bend and probably broken. Could you please show how to replace it/fix it on the E6430 that would be awesome and thanks again for your videos!

Instead of a thermo camera you can use a laser temp meter. With this you can scan an area and see the max temp encountered while pulling the trigger.

good sr

really u are extra technician ,i have seen your tutorials (your amazing videos). its so important to me... thank u sir.. i have dell latitude E6420 laptop here.but once upon time it suddenly fails to start up...i'v tried some times.here these are its problems 1.when i press power button its shows light on then immediately turn off. 2 when charger is plug on the charger indicator shows light on and after 2 or1 second its turns off (charger cant charging here).3 the laptop cant start on...so please help me as much as possible if u don't mind thank u

Hi sorin, please explain more about power rail, what is power rail on mainbord?? Kindly make a tutorial video about power rail and how we can recognise that. Thnx

The 2 mofets from the input is to protect the battery to get 19V when the charger is plugged in, If you don't have the 2 first mosfets you will have battery voltage on the charging port , Yes the battery is protected but what happens if that fails ? Yes it has a fuse but you would eventually kill the battery

Sorin. Hope after a hard day's work fixing electronics you can relax and switch on BT Sport channel. Women's Aussie Rules football starts tomorrow. Greetings from Melbourne.

HI, do you clean the ribbon cable with lighter fluid? Thank you

Cool

What electric screw driver are you using?

Well done :-D, the lighter fluid is handy.

Funny, the screws were rolling away like rats leaving a sinking ship.

aaa we dont have to put back that capacitor, it will be ok dont worry :))))))) love it

Hi, Nice video as always! I have a faulty DELL 6420 C96Q5R1. I think I killed two usb ports on the right with a bad service cable during phone fastboot process... Anyway, it's not starting anymore. I can enter the bios menu, I can use the 3rd usb port on the left for a mouse. I can see that port is functioning during boot process, but the notebook is stuck after selecting boot device. Empty screen...nothing else. I trled with battery off + charing cable. I also tried with and without harddrive... What should I check? Tibor from Hungary

Sorin, what is your opinion about that thermal paste you're using, the Arctic MX-4? Thank you.

meany thanks

Hi Sir, i'm your subscriber from Indonesia, i'm using this model to, i have some issue for little electric shock in the side of palmrest specially when charging this laptop, my i know what is the problem and your advice? thanks in advance sorry for my english....

sir more videos about brute force please.

And also what about thermal paste.. which one are u using .. i do have one with white color

When we want to use power supply to check short on mainbord, we must put plus on first mosfet?? And check the which capasitor get warm??

Hey, I have a laptop (Dell E4570) with a burned IC on the motherboard. How can I find out the name of the IC to replace it? I don`t know where to look 😅

For these business class laptops, if you don't know what screws to remove or put back In, see the service manual

Please give me a information how to fix a problem with sound on E6430. My speakers are dumb. Audio drivers (on Win7) are installed properly. When I use right key on speaker icon and i choose option 'playback devices', I see LOUSPEAKERS and COMMUNICATION HEADPHONES. While playing any sound, at right side of 'speakers' shows green 'sound indicator' - it is ok. The speakers gives no sound, but if I use option 'test device' on 'communication headphones' i can hear normal sound for the duration of this test (about one second). I tried also in LINUX, there was no sound.

Have you ever set the petrol liquid on fire by sparks from shorts?

Use Isopropyl alcohol instead. It is more exact and faster way to find the short.

Sorin the Dentist xD

❤👍Super ❤ 👍

The capacitor you took out and did not replaced was not a power capacitor ,if it was you have to replace it

HP Probook 6560b power led and caps lock blinking continously. Researching in the internet, it is indicated that it's the motherboard issue. Any experience with this?

Let me know sir.. which electric screw driver are u using to unscrew laptop..i need one..

12:40 if you want to go direct diagnose

👍👍👍👍

Please don't become a Dentist Sorin :)

i have acer 5738 and cleaned it after that its get shutdown abruptly after 10 to 15 min. i haven't change the thermal paste .does thermal paste is not working . i had cleaned it because it shut abruptly in 10 to 15 when using internet but running normal for hours . i am confused where the problem is

how would you find value for that cap if you had to put it back?

Can i use the pétrole of cars if ihave not a zippo petrole

Does anyone have any idea where can i find tape/film like the one he's peeling at 12:43? My hobby is restoring laptops and sometimes that film is worn out so i need to replace it.

"Ok it's like when you go to the dentist and the dentist extract the wrong tooth" ahahahahahahahah it's the same here the memory go away np man is called "STRESS"

my laptop is Latitude E6420 when i press power button it immediately power on for 1 or 2 seconds,then shutdown itself and also when charger is plug in it show light and immediately off,it show short sign how i solve it..???

Sorin you drive me crazy the way you toss the screws around on your desktop which of course shows people how experienced your are at opening and closing an diagnosing a laptop fault in record time. We amateur DIY people panic when a screw go's missing.

Thanks papa, I have this same laptop, when you press power button, battery brinks orange 4 and 1 white pattern, but wont turn on. When you press the button again the fan rattles and shuts down, still no power on. Have you ever fixed a dell of this problem, if so please link me to the video. I can't come to you am in Africa. Thank you for your videos again.

The fastest short cap killer of the west.

Where do you buy your thermal paste? My last 2 nt-h1 paste from ebay have been fakes. They acted more like glue than thermal paste, because the heat sink came off with cpu. Sometimes the laptop boots and shutdown a few seconds later or it doesn't boot at all.

sir gooday i have same laptop no display hdd led blinks and wifi charging stays light what is wrong? thankyou

Jeez it reminds me of an HTC one m8 or something, it's so complicated.

Hay ... I have a problem similar to the same model, the device suddenly turns off and works shutdown without command and it works again without any use of the power button .. then the device I cannot use because of this problem This problem is repeated if it is connected to the charger or to the battery

Construction of the Dell laptops is very solid. Businesses held onto these for 7 years, bad for Dell business.....

What is the name of the petrol you use to detect the short, it's isopropyl alcohol?

Am un laptop defect și vreau sa il trimit la o diagnoză.cum pot lua legătura cu dv?

What if the LED in the adapter keeps on blinking after plugging in the charger, how can I tackle that problem in dell latitude E6420?

How much did you charge a costumer with that kind of fault?

I hate working on older Dell computer just for that reason. I like the older Alienware much better 2 screw and have full access to the MB.

Sorin sir please do modify Normal laptop charger into Dell charger light indicator 😅😅😅

how can i do that technique the touching technique? should i plug the charger in so that the bad capacitor will heat up? it is safe to do that? will i get electrocuted?

Where we can order your electric screw driver??

Don't worry, u can still walk with one leg. hahahah