I only wish I could be as successful as Sorin when it comes to fixing electronics. I have so much respect for him that I watch every single video he produces. I always smile when watching his videos because he is so wise to know to order by the number on the screen, not the model number on the computer.

sir you ar happy to know that i used you technique to resolve the backlight of a Dell laptop the led enable signal is missing so, I provide 3.3 volt to the LED en.and the laptop works fine. thank you so much. love your videos keep doing. stay safe in lock down. lot's of love from india ❤️🤗

The problem was that the screen brightness was adjusted to a very low setting. This setting is saved in the I O chip. When you added the 3.3 voltage you reset the brightness level. Great deductive work.

Nice video,I don't know anything about electronics but through watching your videos I have fix a lot of laptops for myself and friends,thanks a lot and God bless you.

From Tanzania! Thanks Alot Sorin, Next Month Im About To Open My Own Repair Shop Based On Your Knowledge

Mr. Sonnin, I’d like to thank you for doing what you do, it means a lot to me..As you said in one of the beginners video, which I’m very much a beginner, your trying to reduce 5 years of going to school to 20 minutes (pretty funny, and true) ..I’ve made the phot sensor, made the liquid flux and as I mentioned on first comment the homemade hot air gun..(need much practice)..going thru the fundamentals of electronics is extremely helpful and I hope you continue beginner videos...Audio equipment is what I like and am currently working on an old ADC equalizer which the first thing I did was burn a pad out..I did a jumper, and really don’t know if it worked as still no lights come on, on one side of the equalizer which is a 20 band equalizer, so 10 lights are not working..proper grounding techniques would be cool..If I ever fix it, I will owe it all to your videos..

Sorin, You have a true gift my friend & its your captivating teaching style, you put us the viewer there with you your able to talk to the camera the way you would talk to a student in front of you. the way you say "sorry you cant see" when you know we cant see what you see because the microscope out of frame Thanks mate for doing what you do, your a "proper good" bloody legend, Greetings from Australia :) Charlie

Salutari si de la Timisoara Sorine,te urmaresc cu mult drag cu toate ca eu repar chiestii doar asa justfun, dar ma ajuta foarte mult postarile tale si experienta ta.Ai tu o asa o carisma aparte .Te salut cu stima si respect,tine-o tot asa si bafta multa.

thank you so much sir. u help me so much when i troubleshooting in my net book. i never experience in repairing laptop/netbook before. i always watch on ur videos then learn so much. now i reapaired 2 laptop. may u continue in sharing ur knowledge.. 😏

GREAT VIDEOS ALWAYS .SIMPLE WORDS SIMPLE EXPLANATION EASY TO UNDERSTAND. we are waiting for more and more i wish you all the best mr.sorin

Amazing insight....... Enjoyed your videos as always.. Remain blessed sir

Master Sorin,good job as always.

it is a classic, you opened a closed/stuck gate with the voltage feed

Hey Sorin. Been a while since i last checked in on your vid's. Great channel my friend ;)

I like the magic you have done ✅ You are doing great i now how it works. Great explanation that we need all the voltage to have the screen working. Thank you for the video.

Nice teacher because as i know the teacher have to discuse and you have give a student problem solving thanks man because 1 out 10 people they have not share her knowledge im proud to be your student

Sorine esti belea ! erai bun la electronica de cind eram mici ,ne-am cunoscut la cercul de electronica in Fagaras, ai venit la mine acasa pe Trandafirilor si mi-ai construit primul emitator ha ha ha. Te urmaresc de ceva timp si imi pareai cunoscut si nu stiam de unde te stiu. Continua asa ! Ma uit in fiecare zi sa vad daca publici ceva . Te salut !

Yay another video.... At work watching :)

Watching you while having a dinner. Thank you

Yay, another video, another lesson. Arigatou gozaimasu, Sensei

LED_PWM, I read that as pulse width modulation. Are you sure it wasn't that the brightness was turned down and you putting the voltage on it causes it to rise and remember the brightness setting. PWM being a pulse train that adjusts in width to give brightness level.

another funny and enjoyable and very very nice tutorial sir

Stiu ca esti Roman ca te urmaresc de foarte mult timp. Esti genial! Totusi, incearca sa omori ticul asta cu "yea" ca suna ingrozitor si e iritant! Keep doing what you do !

Awesome, I wish to be like you, you just fix things as if they are nothing.

as written below" PWM being a pulse train that adjusts in width to give brightness level. " you missed checking for changes in brightness and it works fine(Fn)+ F4,F5 or up and down arrows. very nice issue +++

you unfroze the chip a wee jolt of power iv seen this on a few of your repairs your just a lucky man anyone else would have blew the chip

Thank u sir . ive learn so many with u . also u explaine !. thank u very much for share ur knolage with us. i was able to fix my dead toshiba motherboard .

Lucky . On my own HP amd laptop I had screen But no pwm pulse Had to change big m- board ic. then all back to 100%. you can easily do a quick fix but you will have control on your brightness. Good job Sorin.

Your happy that "it got fixed". I know that feeling ;)

i love your every video. im your big fun

Nice and instructive video as useual

Let's check togather is a feeling like i am working with him... 😊👏

Amazing fix . Great

thanks for the video. Do you know if the chromebook acer 714-1w haw the emmc removable or soldered?

The brightness was turned all the way down when they replaced the screen. That's why it came on brightly when you applied 3v. You should have put the old one back in, and it would have worked too.

It might have been worthwhile to probe the PWM line with the oscilloscope to see if any signal was there. If it had reduced amplitude the voltmeter might not have detected it properly.

Useful video 👍

I know that you are magician had the touch of wizard Big thumbs up

nice repair 👍👍👍👍

Just your magic touch 🥰

Thank you VERY much!

Hi GrandMaster, thanks you for teach us. Do you know where find BIOS dumps for programming laptops? A lot of pages have ones, but is so expensive.

Great save

Hi buddy only just stumbled across your channel before the vids you do and the way u explain is brilliant what is the power supply u use for your testing

Thanks for the good video, i think when they replaced the screen they pushed the bright minus button to low and when you put the 3.3 there you kicked up the capacitor who is connected to a mosfet to maintain the brightness...please tel me if i'm wrong?

I have a laptop with the same issue and i fixed with the same way

The man that swapped the screen must have hit the screen off key, the Pulse width modulation test point was at zero, you applied power to it and the shock must have reset the pwm driver.

hey sorin love u channel

Many thanks for the wonderful tutorials. Really interesting. I need help on tutorials that's based on all components of the motherboard. PDF materials that talks about it maybe helpful as well. Regards.

you awaken the sleeping voltage hahahaha...Sorin is a good teacherrrrr hahahaha

Hello I have a question. I can't find a schematic on lenovo yoga tab3 model: yt3-850m. The tablet was damaged by water, the oxidation removed by lcd flex not affected. thanks to all for your help

I have a feeling there was a discharged capacitor on that line after supplying 3.3v externally then it charged up and current started flowing normally.

thanks dude

yep led pwm is deffinatly the lcd brightnes control connecting it to 3 volt just gives it full brightness

Hi sir my laptop lenovo thinkpad which has samsung ltn141bt08 display and get white display problem can u provide a solution of this

The PWM could have been shorted to ground (in the chip or motherboard somewhere) and you injecting 3V3 blew the short. If it was the PWM driver chip, it might mean that you have blown the PWM transistor pulling it to ground inside the PWM driver chip. A way to check that is the check the PWM signal on an oscilloscope or try adjusting the brightness down and if the LCD brightness doesnt go lower it is now stuck on full brightness

THANKS

i have another board no power no light , also the 19v on charger its ok but when pluged not even directly from de pins ..it only give 1.5v and mosfet hot. i replaced the mosfet. and its the same . but without the mosfet no short to ground. what can i think abaut this :(

Yes, pwm means pulse width modulation which will vary the brightness of the screen. The activation of 3.3 volts started the pulse to widen which varied the brightness of the screen.

I'm having problem with hpG4 motherboard 3.3v is present in sio and power switch not present in bios chip so laptop did not power on any body with good idea please.

20:46 nice one Ha ha ha :) Nice job Respect

SCL and SDA pin ... i2c? can we drive this screen width arduino?

hi i have a different problem i have a blown 2r2 inductor does anyone know where i can source the part? or the actual part number please? thanks

Hope it doesn't turn out to be an intermittent fault. I always hated it when I couldn't reproduce the customer's reported fault. Having magic fingers can be a curse...

Some forbidden situation somewhere. If the foult dont come back its nothing to worry about. Great Video. What will u use to clean the screen if its dirty?

what if a capacitor is shorted to ground from both sides, i removed the capacitor test it was working fine but it's place on the screen pcb is shorted to ground from both sides

I always order screens by the screen number - never had a problem. You need to remove battery and power when connecting/disconnecting screens or you risk blowing fuses. Happened to me on a T430 Had to completely disassemble it to find the related fuse on the back of the mainboard. My bet is brightness was set so low... screen had no backlight.

i confirm that , nice work . all what you need to do is Just puting a short circuit between LED_PWM -3.3v- and LED_EN . Note : does not mean a faulty panel or a fault motherboard is a question of compatibilty . .

Exact cum a spus si colegul Digi Horse, LED_PWM nu este led power ci led_pulse width modulation. In concluzie si eu cred acceasi treaba, in momentul in care ati venit cu 3v sa memorat valoarea maxima. Exclus condensator in scurt dat viind faptul ca erau doar 3v si curentul dat la minim sa arda acel condensator in scurt. Oricum un material bun si educativ :)

I wouldn't check the Led_pwm with voltmeter because the voltage will normally vary depending on the duty cycle of pwm. Instead I would use frequency tester (hz) to see if it's really running at intended frequency. The boost converter for led supply is actually controlled by pwm signal, and the voltage output that controls the brightness of the led can vary by changing the duty cycle of pwm signal.

what was the tool used to to charge the LED?

What do I do if I have no voltage on led vccs

Hi,unfortunately cant find button to send a pm. I have an acer with a power problem. Without battery,plug in to main ,push start button,fan starting,dvd writer starts for that start check but hdd does not start. I need to plug in and out several times to make the laptop to start. What could be the problem? Tested with another charger and same thing. Multumesc :)

Good .... thanks

What multimeter are you running nowadays?

I didn’t remove battery when unplug screen connector. It go wrong now power on and off suddenly it’s damage which component ? Anyone have a suggestion?or video that he fix it

When he tried to change the screen he caused a short so in the super sheep there is an internal block or sweetch to protect it so when you plug the 3.3 v you refresh it this is what hapoend thank you

do you repair tv / lcd led sir? thank you

hello It was happend , like some devices ,have the brightness off or at minimum, and given the impresion that is a BGA problem, but not.I think, that when the brightness control circuit detect current flowing, he set the brightness to this level.All the times in almost all the circuits, exist a current control, or a sense rezistor, which inform the IC .This was Marcel opinion...

You always lucky Mr Sorin.. I am the only one to have several problems at the same time? Several shorts

Yeah...pwm pulse width modulation signal comming from super io..via resitor buffer..maybe static zap.. super io stuck ? Thats weird.. normally i find pwm and or enable comming from super io dead then requires a dodgy bypass to a 3.3 volt rail orchange super io...

Am o intrebare, te rog sa nu razi :))) . Din greseala am masurat cu modul dioda pe multimetru o rezistenta prin care cred ca trecea curent alternativ. S-a ars rezistenta multimetrului si imi arata mereu 1 . L-am bulit sau pot sa ii mai fac ceva ? :)))

This time petrol wasnt needed just amps and you fixed it.

Hi guys. I didn t understood why motherboard can be damaged in case of screen replacement while power or battery is plugged in . May anyone explain thanks.

استاذي الكريم لك كل الشكر عندي سؤال لو ان المشكلة في backlight كيف الحل واذا فيه فيديو

sorry for disturbing you, i need your help. i have laptop was working everything ok but fan was dusty, i disasamble laptop took out motherboard and fan, clean it with 93% votka, alchohol.... after i build again, i used new HDD and write new windows, in installation stage was no working touchpad and i used extrenal usb mouse. after full install and drivers was all ok, no touchuchpad in device mamager, it seems he cant see my touchpad. but my touchpad is lighting. laptop model is hp dv6. with i5 second gen.... thank u sorin. help me if u can and i know u can. i checked voltages on touchpad connector and there was but two middle pins was zero... i can told u tomorrow more acurately and can take picture of this pins. it was dusty and i clean it.... didnot touch with anything....

hahahahahhah it work some time this case done with me ( good work i flow your channel ) i work in hp company in maintenance laptop

My guess is your colleague didn't actually remove the battery and when he replaced the screen and Super AIO protected itself by cutting the power down and what you did with your power supply was basically a reset. Just a guess, I have replaced a screen few days ago with the battery in and there's no backlight anymore, haven't looked at it yet but I'm curious if it's exactly the same like on this Chromebook.

The Sorin Magic Touch strikes again...

Can an application called Desktop lighter help reduce the brightness. I use it on desktop. Please try and use it on a laptop with this problem where you can't change brightness. Hoping to hear from you that it works

we need ECU repair video also

Mr. Sonnin, I would like to ask you about voltage supply. I watched your video oh how to make a homemade hot air gun..The gun I made is fine, controlling voltage,..A voltage regulator supply...I need help with..My house outlets are 110volts..Is there a video you have showing how to make this? Maybe I’ve missed it..I’m just watching your videos because it gets so confusing..I’m stuck..Hope this makes sense.

Maybe was shorted by a cap. Then when you injected voltage the cap burned. Then the short gone...

What crossed my mind a stuck or lazy gate ,on the voltage side, what would I know I'm a TV man :)

hi, can anyone answer my question? I have Acer nitro 5, unfortunately, I dropped little water on it I open and see there isn't damage on the motherboard but it won't turn on. I sent to the one service and they said GPU (gtx 1050 ti) fired . is it possible? I dropped water when it's not plugged and my GPU works only when it is plugged in?

Dear sir, my Dell laptop 15 3567 after the shutting down he restart automatically after 15 - 20 seconds. I change the os 2- 3 times but problem not solve plz help me sir.

well we all know electronic stuff does strange things at times ! if i were guessing, i would go for maybe the laptop has a "safe state" for the screen if the cable gets shorted etc ? and maybe putting 3v on that line reset it to a normal state ? who can say ? :)

nice work, there are a few possibilities as to why it fixed it's self upon giving it the 3.3 volts, two of which have been mentioned already. LED_PWM is infact LED_(pulse_with_modulation) which makes me think what was the original screens problem.

I think it just need to reset the superIO chip or the chip that handles the back light . And it has been reset when you put power on the screen. Sorry my English is very bad

I think brightness was zero at the beginning when you pushed voltage on pwm test point it increased brightness