Everything about the laptop backlight, LED Screen Voltages and Signals

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  • เผยแพร่เมื่อ 15 ม.ค. 2025

ความคิดเห็น • 197

  • @RafaelAmorimmeu
    @RafaelAmorimmeu 5 ปีที่แล้ว +4

    Honestly I should thank you very much for this video and this gentleman. I have an Asus Zenbook UX330UA 3 months ago with the black screen. I had already checked all the tracks, apparently burnt out components, damaged cables, power outages, after all, it was almost certain to buy another full screen. But after watching this video, I went to test the mentioned voltages (LED_EN, PWM) and everything was ok, but I remembered the fuses that he showed just before, and amazingly, when testing continuity in one of them, one did not whistle, success! Localized fault, fuse blown. With the multimeter on to measure high currents (10A) I connected it in series with the fuse and Voilà. The screen lit up properly, with my beautiful wallpaper, now just looking for a new fuse to replace. Thank you so much for sharing this information. It really isn't easy to find content on this level of quality hardware. You are amazing, I am another subscriber!

    • @zXHAcKeRzXz
      @zXHAcKeRzXz 2 ปีที่แล้ว

      My UX480FD-BE0 Has no backlight after some water incident and I brake the LVDS connector and soldering point by trying too hard to get it off. It would be really nice if you made a video showing your diagnostic and repair, because zenbook video are so rare

  • @saarike
    @saarike 7 ปีที่แล้ว +36

    This is really nice. I really appreciate people like you, who makes a lot of work to share knowledge about electricity and other stuff. There is very little information about that thing, witch you explained very nicely. Thanks a lot of these videos! :)

  • @shqiponjagv
    @shqiponjagv 7 ปีที่แล้ว +1

    I really appreciate people like you, who makes a lot of work to share knowledge about electronics and other stuff. Thanks for this tutorial.

  • @alaster33
    @alaster33 7 ปีที่แล้ว +8

    That's the Mars Element , working its influence ; thanks for showing up full of cold , you teach me so much , get well soon my friend

  • @pettahprize6114
    @pettahprize6114 6 ปีที่แล้ว

    Mr. Sorin , we need more & more lessons like this , carry on pls

  • @devil2005iscool
    @devil2005iscool 5 ปีที่แล้ว +4

    The PWM stands for pulse width modulation. jumping it will mean the "mark time" is 100% therefore full brightness even if the user tried to dim the backlight using the keyboard. Good video keep them up :] I like seeing repairs from different perspectives. The difference between knowledge and understanding.

    • @IsaacOLEG
      @IsaacOLEG 2 ปีที่แล้ว

      thanks for the comment, yes I was thinking that once bridged you cannot dimm led anymore. '(because of the "3.3v ) is it ?

  • @albertalvarez5901
    @albertalvarez5901 7 ปีที่แล้ว +2

    Thank you sir for your video's another one for the books. I bought a Samsung Tab 2 with the screen having issues changing colors and weird lines on it so I remember one of your video's so I bought it and fixed it so easy...

  • @azriamir3517
    @azriamir3517 7 ปีที่แล้ว +2

    Get well soon sir. Thanks for the great video

  • @giorgostexnikos6976
    @giorgostexnikos6976 5 ปีที่แล้ว +1

    this knowlege is gold.thenks professor.

  • @revingtosh
    @revingtosh 6 ปีที่แล้ว

    This is my new favourite TH-cam channel. Thank you so much for all your tuition and hard work Sorin - it is much appreciated.
    If ever you come up to Liverpool - i'll buy you a beer :-)

  • @sinankuniyilathoot5188
    @sinankuniyilathoot5188 4 ปีที่แล้ว +1

    i repaired a laptop and and an emergency lantern because of sorin his vedios are great!

  • @mrb3653
    @mrb3653 3 ปีที่แล้ว

    Thank you so much for this video, gave me the confidence to attempt again to repair my laptop.... located the fault and now fixed.

  • @Timpano_Francesco_Repairs
    @Timpano_Francesco_Repairs ปีที่แล้ว

    Hi Sorin, very efficiente explanation on how the work the signal thank very much

  • @haimt
    @haimt 7 ปีที่แล้ว +20

    thanks for tutorial , a small correction the PWM (pulse wide modulation) is not POWER but the signal to control the intensity of the backlight!

    • @electronicsrepairschool
      @electronicsrepairschool  7 ปีที่แล้ว +19

      Thank you, probably you are right, but i always bridge that one to 3.3v to get light on the screen. Maybe the day will come and i will finally have to read a laptop schematic :)

    • @haimt
      @haimt 7 ปีที่แล้ว +11

      you are very good without schematics , I am learning a lot form you tnx u very much!

    • @electronicsrepairschool
      @electronicsrepairschool  7 ปีที่แล้ว +7

      Thank you

    • @Wuety06
      @Wuety06 6 ปีที่แล้ว +1

      Uh... u sure about that ? Pwm ..pulsed dc is used to power leds all the time

    • @thingshappen9199
      @thingshappen9199 4 ปีที่แล้ว

      ​@@electronicsrepairschool Hey Sorin i'm confused by some contradicting information you have put out there. If you go to 11:50 min in this video you said that on VLED there should be 19V however, when you go to this video th-cam.com/video/eHAysowx6ow/w-d-xo.html you mention that VLED is 3.3 V at 41:29 min. Please help me get this clear. Thanks much.

  • @ercost60
    @ercost60 6 ปีที่แล้ว +1

    Zdrastvuytye, moy drug! Thank you for this very helpful video on material not covered anywhere else, you make this stuff look easy. My Toshiba CL45 had no backlight, and after watching your video I found a blown SMT fuse on the 19V side and fixed it. Balshoye spasiba! PWM=pulse width modulation. Varying the duty cycle (% of on/off time) to the LED backlight controls the screen brightness.

  • @pinakbhattacharjee7475
    @pinakbhattacharjee7475 7 ปีที่แล้ว +2

    thanks ... a very very good explanation ..the jumpering we also do but u explained it so simple.

  • @adrianbullecer5749
    @adrianbullecer5749 3 ปีที่แล้ว

    what a brilliant tutorial. very detailed. Long live to you sir!

  • @verdunelectronics9985
    @verdunelectronics9985 7 ปีที่แล้ว +3

    hope feelin better nice video

  • @pettahprize6114
    @pettahprize6114 7 ปีที่แล้ว +3

    It is another very very useful tutorial for us,, Thanks so much ,,
    And also get well soon mr.sorin ....

  • @abisaiamatalo2769
    @abisaiamatalo2769 6 ปีที่แล้ว

    Awesome videos. watching all the way from Kenya.

  • @rashh77
    @rashh77 7 ปีที่แล้ว +1

    Nice tutorial. I hope you get well next time. Get some rest and warm your self and take something heal.

  • @sohailahmed6095
    @sohailahmed6095 7 ปีที่แล้ว +2

    Thank you so much my beautiful teacher

  • @devanrajah9561
    @devanrajah9561 5 ปีที่แล้ว

    You are my hero brother. Helped me outta a bind. Taught me so much. Thank you.

  • @yuanho2883
    @yuanho2883 7 ปีที่แล้ว +1

    Thank you! Hope you get well soon.

  • @knightwar3
    @knightwar3 3 ปีที่แล้ว

    Thank you for sharing the diagnostic tips

  • @pradipkhairnar
    @pradipkhairnar 6 ปีที่แล้ว

    Thanks sir.. you explain complex problem so nicely..it helps a lot

  • @TheOmerjaan
    @TheOmerjaan 7 ปีที่แล้ว +8

    thumbs up for a legend 👍🏻

  • @killitcam1324
    @killitcam1324 7 ปีที่แล้ว +5

    love the videos lots of good knowledge YA ! i lean from you many things YA (in russian accent) after i watch these videos man i always find myself talking like you YA lol thanks for the knowledge though much appreciated

  • @saramatelot8322
    @saramatelot8322 10 หลายเดือนก่อน

    Thank you, helped a lot with my assigment!

  • @dumezwenidube9952
    @dumezwenidube9952 5 ปีที่แล้ว +1

    Thank you sir. Great lesson there.

  • @TheForexplanet
    @TheForexplanet 3 ปีที่แล้ว

    I love ya man, you are a great teacher and you know so much.

  • @sadsea4285
    @sadsea4285 7 ปีที่แล้ว +2

    thank you ...really really i appreciate your help...thanks alot...

  • @iv4nosky
    @iv4nosky 5 ปีที่แล้ว

    Thank you Mr.Sorin!

  • @komputel1
    @komputel1 6 ปีที่แล้ว

    bets regards from Poland pozdrawiam zajebiście tłumaczysz człowieku

  • @livancalcedo4626
    @livancalcedo4626 6 ปีที่แล้ว

    thanks for for the info you are a good teacher and electronics repair man!!

  • @domzzz1488
    @domzzz1488 7 ปีที่แล้ว

    Good videos, Thanks for uploading them.

  • @paochitamanio8117
    @paochitamanio8117 ปีที่แล้ว

    very useful thank you so much

  • @drrrw
    @drrrw 4 ปีที่แล้ว

    Absolute gold mine.

  • @travelinguganda7958
    @travelinguganda7958 3 ปีที่แล้ว

    Thank you so much sir, hoping to pay you a visit after covid-19

  • @PerrynBecky
    @PerrynBecky 7 ปีที่แล้ว

    I have a laptop with a dead screen. I will definitely check it out with your tips. Thanks.

  • @viraldhangar5200
    @viraldhangar5200 7 ปีที่แล้ว

    sir very nice tutorial, sir you are explained very nicely.

  • @hexenkonig66
    @hexenkonig66 6 ปีที่แล้ว

    Thanks Guy, you help me solve my display issue

  • @yuvarajan6678
    @yuvarajan6678 2 ปีที่แล้ว

    Thank you sir,your video very very helping for my knowledge sir thank you very much sir.......

  • @dannytube474
    @dannytube474 7 ปีที่แล้ว +2

    Hoping you are feeling much better my friend , Maybe when you went to Chafford Gorges Nature Park you caught something :)

  • @jhaymhay1227
    @jhaymhay1227 4 ปีที่แล้ว

    Thank you so much, I've learned a lot to your video

  • @amuthan4137
    @amuthan4137 7 ปีที่แล้ว +1

    I am new in laptop repair though little experienced in mobile phone repair.in today smartphone PWM(Pulse width modulation ) singnal is generated in a 6leg light ic with direct battery voltage (3.7) and EN Signal from Power ic. In this section mostly the output diode or main supply gone faulty.thanks for your tutorial.

  • @rolandosalgado1552
    @rolandosalgado1552 6 ปีที่แล้ว

    Thanks for share, very important procedure for test the signals to turn on the backlight leds, !!!! :)

  • @benedicternest4521
    @benedicternest4521 6 ปีที่แล้ว

    Thanks so much for this tutorial!!

  • @z14t
    @z14t 10 หลายเดือนก่อน

    Get well soon

  • @technicalsupport1571
    @technicalsupport1571 4 ปีที่แล้ว

    Very Accurate, Thanks for this boss.

  • @masocco79ify
    @masocco79ify 2 ปีที่แล้ว

    You are a GURU of this... i appreciated all your videos about this issue. I Have an Asus Fx504 (gaming laptop) it has a backlight off. I tried all of your advices, change ribbon cable and led also. Voltages on led board are fine..19V, 3,3v Led-PW ,3,3V led-en. All Voltages on mainboard ALL fuseS, mosfets, etcc are WORKING FINE!!! But Backlight seems doest't work still. I don't know what can i do for repair my notebook! :(

  • @alirafique1757
    @alirafique1757 5 ปีที่แล้ว

    thanks alot ..for teaching us

  • @easypipsforex4741
    @easypipsforex4741 7 ปีที่แล้ว

    Thank you for sharing your knowledge. great videos. gracias

  • @AyadEKorial
    @AyadEKorial 3 ปีที่แล้ว

    Thanks 😊

  • @sadiqtv307
    @sadiqtv307 5 ปีที่แล้ว

    thanks sir good job

  • @computersrepaircotesaint-l7407
    @computersrepaircotesaint-l7407 7 ปีที่แล้ว

    Thanks very much again

  • @ricanavarro9589
    @ricanavarro9589 7 ปีที่แล้ว +2

    get well sir.. dont die ok.. we may not see one like you to teach us.. thanks u,

  • @khalidkhatri2602
    @khalidkhatri2602 5 ปีที่แล้ว

    Hi you are great man 👍

  • @deepumullaka
    @deepumullaka 4 ปีที่แล้ว

    Thanks dear i have a short circuited lcd even though i removed those short circuit, 3. 5 was missing in led en but when i shorted that with pwm, the led eventually start up and 3.5 voltage was there on both points
    Screen was N156BGE❤️

  • @RightEyeOfRa
    @RightEyeOfRa 6 ปีที่แล้ว +2

    Great tutorial man! Thank you very much! I need to vape to get this job done!

  • @faiyaz693ify
    @faiyaz693ify 7 ปีที่แล้ว

    Thank you sir.

  • @plamenpetkov6958
    @plamenpetkov6958 6 ปีที่แล้ว

    PWM means Pulse Width Modulation. By changing duty cycle on this pin we can continuously vary the brightness

  • @henriquepereira4058
    @henriquepereira4058 4 ปีที่แล้ว

    Pwm means post with modulation which is variation of voltages on with of a square tooth signal

  • @charlesdoe800
    @charlesdoe800 7 ปีที่แล้ว +1

    very good

  • @ravindraadapa2952
    @ravindraadapa2952 11 หลายเดือนก่อน

    Hi sir I am very happy to follow you on your good videos sharing knowledgeable ones each have unique experience sir I'm having one question on this screen voltage can we check manually without connection between laptop mother board to confirm that screen is good or bad? Please clarify if possible

  • @georgeabaji638
    @georgeabaji638 5 ปีที่แล้ว

    thank u very mutch sir.

  • @MAXSLASH-f1b
    @MAXSLASH-f1b 9 หลายเดือนก่อน

    PWM mostly its a Pulse width modulation for lcd backlit Cold Cathode Fluorescent Lamps it is sending signals for inverter in your cause.

  • @bFABIO
    @bFABIO 4 ปีที่แล้ว

    I need your knowledge!

  • @anselmomatusse6090
    @anselmomatusse6090 3 ปีที่แล้ว

    Thanks for everything . You a the best teacher I know. I am technic for computer in Africa, Mozambique. If I need you help how I get you ???

  • @Dr.muthanna
    @Dr.muthanna 7 ปีที่แล้ว

    Super

  • @interunkagain
    @interunkagain 3 ปีที่แล้ว

    Legend right here!

  • @vitobratta3937
    @vitobratta3937 7 ปีที่แล้ว +1

    nice video and knowledge to share by the way if the screen no showing backlight can i jump the wire the same as you did?

    • @electronicsrepairschool
      @electronicsrepairschool  7 ปีที่แล้ว +1

      showing no backlight, but what about the picture? if is picture, yes, you can , after you check which one is missing

    • @vitobratta3937
      @vitobratta3937 7 ปีที่แล้ว +1

      thanks sorin i have the same problem showing picture but no backlight i take 3.3 volts jump to pwr led on and now screen have backlight thanks for sharing

  • @leso204
    @leso204 3 วันที่ผ่านมา

    The 3.3v bridge a good shout would injecting 3.3v with power off still turn on backlight ??

  • @tarkan06a
    @tarkan06a 7 ปีที่แล้ว

    thanks bro. my same problem and i only clear connector .. backlight working . again thanks

  • @dtech406
    @dtech406 ปีที่แล้ว

    In a situation where a normal current is in all the places, what do you check next week?

  • @rudiarta
    @rudiarta 8 หลายเดือนก่อน

    sir is that we need osciloscope to check like signal thing on lcd ?

  • @tahirhuntergrup6696
    @tahirhuntergrup6696 6 ปีที่แล้ว

    thankx a lot

  • @SUIN1
    @SUIN1 6 ปีที่แล้ว

    Thanks. whit this video i found a short to ground of pmw signal in the video flex.

  • @LaptopDisassembly
    @LaptopDisassembly 7 ปีที่แล้ว

    Will the brightness works, when we bridge the pins.

  • @topviralindiashorts5194
    @topviralindiashorts5194 2 ปีที่แล้ว

    Where from you big brother

  • @tuluyangerningdangri4384
    @tuluyangerningdangri4384 5 ปีที่แล้ว +1

    Hello, so im back here yet again...its just another beautiful day dropping by your channel looking at your scary face😅😅

  • @JutyarWafa
    @JutyarWafa 3 ปีที่แล้ว

    Thank you my Dear Teacher and my Hero ...
    after 1 day working and looking for the reason which caused backlight issue! finally I fixed by this video and your very useful information, big Thanks My Dear Teacher 🙏🙏🙏 ❤️

  • @mohammednawaz7222
    @mohammednawaz7222 3 ปีที่แล้ว

    Tbh i follow all your videos and it has inspired me alot.
    Can you please show me a video of fixing the touchscreen issue in sony vaio pro 13 i7 laptop.
    Thank you.

  • @RD-qp3mu
    @RD-qp3mu 3 ปีที่แล้ว

    Isn the PWM signal a pulse width modulated signal to adjust brightness by duty cycle, rather than analogue voltage?

  • @uyijohn6072
    @uyijohn6072 7 ปีที่แล้ว

    thanks very much i just fix one with the jumper from lcd en to 3.3v

    • @electronicsrepairschool
      @electronicsrepairschool  7 ปีที่แล้ว

      thats great, make me fell like ppl actually are learning from this channel :)

  • @mamingujjar134
    @mamingujjar134 6 ปีที่แล้ว

    What was the liquid thing that you used for cleaning? 99% alcohol? or something else? I am a newbie in repair school. I just started watching ur vids a few days ago. Thank you for sharing ur knowledge.

  • @flat-earther
    @flat-earther 2 ปีที่แล้ว

    My ASUS laptop screen has image but no backlight.
    18:40 With the computer powered on I measured from ground to LED_EN 3.3V, and from ground to PWM 0.6V.
    11:48 and this fuse does not have continuity.
    I should replace the fuse right?
    Is there anything else you suggest?

    • @flat-earther
      @flat-earther 2 ปีที่แล้ว

      Does the cause of the blown fuse have to be found? And if so how can I find out what caused the fuse to blow?
      Maybe there is a failed component or short circuit somewhere that caused it to blow?

  • @jollycastillo2230
    @jollycastillo2230 7 ปีที่แล้ว

    where to get 19 volts if the problem is in the 19 volts hoping on ur positive response thanks

  • @tglanz
    @tglanz 5 ปีที่แล้ว

    sir i have a problem please tell me how can i contacy you ASAP

  • @shubhamahuja19
    @shubhamahuja19 ปีที่แล้ว

    sir can i use jumper from pin no 2..3 to pin no 4... because pin 4 voltage is missing.

  • @viperdrake88
    @viperdrake88 6 ปีที่แล้ว

    Really enjoy your channel. I have a similar problem with similar device. Toshiba satellite laptop that has backlight at 100% brightness, any lower the backlight goes out or flickers. Replaced LCD screen (each came with an inverter) and also replaced the cable salvaged from another laptop. Also tried disabling the Intel HD power saving options and in power management, still having same issues. Any suggestions?

  • @ANACONDA_2000
    @ANACONDA_2000 7 ปีที่แล้ว

    What to check if there is backlight but not picture?I havent seen such situation i think on your videos as i remember

  • @worshiperjbannan313
    @worshiperjbannan313 4 ปีที่แล้ว

    Sir good evening pls where do find the fuse on dv 6-6143so mother board

  • @JustJack99
    @JustJack99 7 ปีที่แล้ว

    I don't have 19v, I have 16.8 and no 3.3 anywhere. What do I do now? I have image on screen but dim. Thanks, I loved this video... You are brilliant!

  • @Aint1S
    @Aint1S 5 ปีที่แล้ว

    Good stuff! It's so hard to find these videos. I've got a MSI GT72 aka Clevo rebrand with some serious pink screen and hosting after the laptop had been turned off.
    I don't believe the LCD is receiving the refresh signal. It'll go intermittent with no response and I don't take the laptop anywhere, never have.
    Backlight is lit, but the screen looks burned in as well as the driver area being incredibly hot around the inductors.
    It was working fine after playing a game and I opened it back up afterwards to see pink and an intermittently unresponsive display.
    What do you think?
    Best screen repair videos I've seen... Damn hard to find this channel! 👍🏼👍🏼

    • @amazingtech2471
      @amazingtech2471 2 ปีที่แล้ว +1

      Wtf i have the same problem right now

    • @Aint1S
      @Aint1S 2 ปีที่แล้ว

      @@amazingtech2471 you want to know what it is?

    • @Aint1S
      @Aint1S 2 ปีที่แล้ว

      @@amazingtech2471 The biggest pain in the rear end... The darn ribbon cable and you've got to gut that thing down to nothing. It's not too hard, but it takes time.
      Another issue, these cases are ridiculously brittle too. You WILL break something on the inside, guaranteed. I was just thinking about trying to find another, new case for mine! Nothing obvious or noticable, just the thought of it burns me up when I took so much care as well as time to be so gentle and pieces just fall off the housing...
      $12-20 dollar part and a dumb design that prevents you from simply swapping it out like others...

    • @Aint1S
      @Aint1S 2 ปีที่แล้ว

      What caused it... Shoddy builders toss the cable anywhere in there and it gets pinched from the factory! In a bind from day one and it gives out.

  • @shj802
    @shj802 4 ปีที่แล้ว

    how can i find pwm, b+, b_on, gnd if those are not written on the board?

  • @ismailrhorbti1644
    @ismailrhorbti1644 5 ปีที่แล้ว

    I want to learn the Electronic repair of laptop and phone.if you have ser any course os that please and thank you very much of your video.

  • @SLBackToLifeRepair
    @SLBackToLifeRepair 3 ปีที่แล้ว

    i have a laptop screen my 3v is not comming in my 3v fuse and no display coming what is the problem ?

  • @samirzarour8562
    @samirzarour8562 3 ปีที่แล้ว

    First. Very thanks.
    I have pv with no 19v out.
    I connect a 19v line to lcd point called VLED_IN. Now the backlight is ON but only when the charger is connected.
    When i remove charger. There is no backlight.
    What i need to do?
    There is also VLED_out... what is it?

  • @computersrepaircotesaint-l7407
    @computersrepaircotesaint-l7407 7 ปีที่แล้ว +1

    Hi Sorin
    What if no 19 and no 3.3 in the screen ribbon cable ok just the motherboard doesn't deliver these voltages.

    • @amuthan4137
      @amuthan4137 7 ปีที่แล้ว

      Computers repair Cote Saint-Luc I wonder how ribbon cable get voltage without motherboard deliver it?

    • @computersrepaircotesaint-l7407
      @computersrepaircotesaint-l7407 7 ปีที่แล้ว

      Yep wasn't clear. No 19v on the motherboard to the ribbon cable on the board. the same with 3.3. I have 2 laptop dell latitude e5430 it power on but none of the voltage on the motherboard to the connector.