Everything about the laptop backlight, LED Screen Voltages and Signals
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- Опубликовано: 27 окт 2024
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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! :)
@Taylor Benjamin Cool fake comments. Reported.
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!
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
I really appreciate people like you, who makes a lot of work to share knowledge about electronics and other stuff. Thanks for this tutorial.
thanks for tutorial , a small correction the PWM (pulse wide modulation) is not POWER but the signal to control the intensity of the backlight!
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 :)
you are very good without schematics , I am learning a lot form you tnx u very much!
Thank you
Uh... u sure about that ? Pwm ..pulsed dc is used to power leds all the time
@@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 ruclips.net/video/eHAysowx6ow/видео.html you mention that VLED is 3.3 V at 41:29 min. Please help me get this clear. Thanks much.
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.
thanks for the comment, yes I was thinking that once bridged you cannot dimm led anymore. '(because of the "3.3v ) is it ?
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
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...
Hi Sorin, very efficiente explanation on how the work the signal thank very much
Thank you so much for this video, gave me the confidence to attempt again to repair my laptop.... located the fault and now fixed.
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.
Mr. Sorin , we need more & more lessons like this , carry on pls
Nice tutorial. I hope you get well next time. Get some rest and warm your self and take something heal.
i repaired a laptop and and an emergency lantern because of sorin his vedios are great!
Get well soon sir. Thanks for the great video
I have a laptop with a dead screen. I will definitely check it out with your tips. Thanks.
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! :(
hope feelin better nice video
It is another very very useful tutorial for us,, Thanks so much ,,
And also get well soon mr.sorin ....
Thank you
This is my new favourite RUclips 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 :-)
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.
thanks ... a very very good explanation ..the jumpering we also do but u explained it so simple.
this knowlege is gold.thenks professor.
Hoping you are feeling much better my friend , Maybe when you went to Chafford Gorges Nature Park you caught something :)
what a brilliant tutorial. very detailed. Long live to you sir!
Thank you for sharing the diagnostic tips
Awesome videos. watching all the way from Kenya.
Thank you! Hope you get well soon.
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 ???
Thank you, helped a lot with my assigment!
Thank you so much sir, hoping to pay you a visit after covid-19
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❤️
Thanks sir.. you explain complex problem so nicely..it helps a lot
You are my hero brother. Helped me outta a bind. Taught me so much. Thank you.
Thank you so much my beautiful teacher
Thank you Mr.Sorin!
sir very nice tutorial, sir you are explained very nicely.
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
PWM mostly its a Pulse width modulation for lcd backlit Cold Cathode Fluorescent Lamps it is sending signals for inverter in your cause.
very useful thank you so much
Thanks Guy, you help me solve my display issue
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
Thank you sir,your video very very helping for my knowledge sir thank you very much sir.......
Thank you so much, I've learned a lot to your video
Thank you sir. Great lesson there.
Absolute gold mine.
I love ya man, you are a great teacher and you know so much.
bets regards from Poland pozdrawiam zajebiście tłumaczysz człowieku
get well sir.. dont die ok.. we may not see one like you to teach us.. thanks u,
:))))) i will not die, i will survive :)))
thanks for for the info you are a good teacher and electronics repair man!!
Get well soon
In a situation where a normal current is in all the places, what do you check next week?
many thanks, sir .
thank you ...really really i appreciate your help...thanks alot...
thanks bro. my same problem and i only clear connector .. backlight working . again thanks
Legend right here!
thanks alot ..for teaching us
thumbs up for a legend 👍🏻
Thanks for share, very important procedure for test the signals to turn on the backlight leds, !!!! :)
PWM means Pulse Width Modulation. By changing duty cycle on this pin we can continuously vary the brightness
Good videos, Thanks for uploading them.
Thanks so much for this tutorial!!
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.
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!
check my video about backlight, is a easy job
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.
Pwm means post with modulation which is variation of voltages on with of a square tooth signal
Thank you for sharing your knowledge. great videos. gracias
Great tutorial man! Thank you very much! I need to vape to get this job done!
thanks sir good job
Very Accurate, Thanks for this boss.
very good
Thanks 😊
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?
showing no backlight, but what about the picture? if is picture, yes, you can , after you check which one is missing
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
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! 👍🏼👍🏼
Wtf i have the same problem right now
@@amazingtech2471 you want to know what it is?
@@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...
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.
Hi you are great man 👍
Hello Sir,I like your video very much.I'm learning many things watching your videos.How to contact with you? I need your help Sir
Thanks. whit this video i found a short to ground of pmw signal in the video flex.
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.
thanks very much i just fix one with the jumper from lcd en to 3.3v
thats great, make me fell like ppl actually are learning from this channel :)
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?
What to check if there is backlight but not picture?I havent seen such situation i think on your videos as i remember
thank u very mutch sir.
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?
I have an LP17WP4 LCD screen from an old laptop. I just want to use it for illumination but don't know how to make the connections. Would it work on 5 volts or I must apply 12v?
sir is that we need osciloscope to check like signal thing on lcd ?
I need your knowledge!
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?
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?
Hi! I have a lenovo yoga 500, the backlight on the screen it is okay when is plugged , but as soon as I remove the charger, I don't have backlight anymore...so on battery i don t have backlight only on Ac....what can be the problem?
Hi, i have a laptop screen suddenly stop working when the laptop is on and fans and lights ect and 1 amp draw at 19v -small laptop
I checked at both the M/B connector and on inverter board and get 19V is that all thats needed to turn backlight on or is there a 3.3V somewhere to for text and BL ON?
I shone bright light at screen and cant see any text- Nil and no light- Dead. I connected external monitor and Bios is showing perfectly and i can move around so computer seems ok GPU and CPU ect?
How can both backlight and text suddenly stop? Arent they totally diff circuits OR need extra signals to turn them on even if 19 volts is on the little inverter board
Thanks for any help
where to get 19 volts if the problem is in the 19 volts hoping on ur positive response thanks
Isn the PWM signal a pulse width modulated signal to adjust brightness by duty cycle, rather than analogue voltage?
Hello, can you help me please¿? I have a Dell XPS 15 Laptop, the backlight is off before Windows, even in Bios. External monitor is ok with backlight. I Change the entire Screen (LCD+Cable) and still wrong. I see that with AC adapter the backlight brights 10% more than with battery only (10% darker almost invisible and image flicks a bit). The screen can´t dissasembly and i can´t manage the LCD board with inverter but Screen i purchased is new. I think can be a faulty motherboard but write to you for give to me some advice.
Thanks very much.
Regards.
Hi, my laptop got hdmi socket short circuit when connected to led tv. Both tv and laptop motherboard gone. Now i have replaced laptop MB, display not working. When connected to external monitor its working. I have check display cable and it is fine. Suddenly display started working for 10 secs and gone. Now replaced display working fine.
Please let me know my display worked for seconds. Their might be loose connection or something.please advice me.
Hello there. Can you tell me how much power does a laptop screen require to light up. I ve a damaged screen which gave only white light while attached to laptop. I want to use the laptop screen as a light for some other purpose. Can you help?? Sounds crazy doesnt it
Sir good evening pls where do find the fuse on dv 6-6143so mother board
i have a laptop screen my 3v is not comming in my 3v fuse and no display coming what is the problem ?
Lenovo X240 LCD no backlight. everything else works. Need to use flashlight to see on the screen. tried every trick. no luck. Do I need to replace the screen? Please advise. Thanks
Are there any videos on the laptop screen flickering problem? I have a 17.3 inch MSI LED laptop with a flickering problem. The back light is Ok, I can see the windows screen properly, but I'm annoyed working on it when it flickers. Also checked the HDMI port of the laptop with another led monitor, HDMI works perfectly. Please any solution? 😢😢😢
I shorted lcd board by connecting lvds cable in wrong way can i fix its board
Good afternoon, Electronic repairs school, I am subscribed to your RUclips channel, I would like to ask you something, I have an all-in-one HP when I turn it on, it makes a video test on the screen, a different color is seen every 5 seconds, what appreciation you deserve this failure ? Have you already been preselected in AIO Hp equipment?
thankx a lot