Everything about the laptop backlight, LED Screen Voltages and Signals

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[@haimt]

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

[@queengambuit5425]

sir i have LENOVO IDEAPAD S145.. if I turning it ON.. the LED screen shown a picture if put a flash light at the back of LED screen.. the problem is the LED lights is not working so the screen is so DIMM.. please help me to solve this problem

[@saarike]

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! :)

[@RafaelAmorimmeu]

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!

[@drddddd]

I changed my LED backlight to CCFL and now my backlight is alway ON, even with laptop OFF.. what could be the cause ?

[@aerofinder1997]

No voltage on either side. Neither on the graphics side fuse(3.3v) nor on the light section(that pwm & led en port).. same display with no graphics and no light.

[@SLBackToLifeRepair]

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

[@stevesingh1343]

Im not getting the 19v

[@MANJULA_MASTER_GUIDE]

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

[@titusjapan7572]

Please good morning, Daddy am working on a laptop and when it on the laptop it turns on fine, but the screen remains black but when I heat the northbridge it works very good and after that when i turns it off again and on it back the same problem repeat

[@shqiponjagv]

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

[@albertalvarez5901]

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...

[@revingtosh]

This is my new favourite KZbin channel. Thank you so much for all your tuition and hard work Sorin - it is much appreciated.

[@mrb3653]

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

[@alaster33]

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

[@ercost60]

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.

[@adrianbullecer5749]

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

[@pinakbhattacharjee7475]

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

[@pettahprize6114]

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

[@devanrajah9561]

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