Lenovo G585 no backlight after screen replacement, i learned from this job
ฝัง
- เผยแพร่เมื่อ 14 พ.ย. 2024
- Ebay store: www.ebay.co.uk...
WebSite: sorinelectroni...
Patreon support: / electronicsrepairschool
TH-cam Members: / @electronicsrepairschool
Forum: forum.sorinele...
Discord: www.sorinelect...
My tools: www.amazon.co....
PayPal me: www.paypal.com...
![F.HERO Ft. JSPKK x ลำไย ไหทองคำ x M-PEE - ไม่สนิทบิดหมด (Thai Riders Anthem) [Official MV]](http://i.ytimg.com/vi/kPJZ0UihBfk/mqdefault.jpg)
Many thanks from repair men working in Croatia. You are the real electronic King man. Thanks again.
Excellent video! Thank you for sharing .... It's also interesting to note the emotional side of these experiences, the stress part. The things that run through your mind...One questions "what did I do wrong?"... "I f****ed it up" - a small panic ha ha ha ... but You stayed cool and sorted it out. That's the lesson - remaining cold in following through with the detective work is key. Thanks again Sorin.
Thank you for this helpful video. I had a similar issue with a G510 - no backlight. The display had been flickering when opening and closing the lid, so I thought it was the cable. Ordered and replaced the display cable. That was not the problem. I learned from you how to find and troubleshoot the voltage amplifier circuit and found there was a fuse F2 between the 20v pins from the cable connector and the input side of the amplifier. No voltage on the back side of the fuse! Jumped the fuse and then I had backlightt!
I'd say it was an intermittent LCD cable. The problem was never the panel. You just moved the cable enough to make it re-connect when you replaced the panel, so it worked for 15 mins and then the cable failed again once the lid was closed. I'll bet the customer knew and had been opening the lid 20 times to get it to come on each time. They didn't get it fixed until it got too bad. Customers are lovely and forthcoming with important details like that ;-)
Had a couple of laptops with exactly the same problem ( super io chip ). I am repairing second hand devices which we sell with warranty. Sadly - had to replace the mother boards cause the customers wouldn't be happy with full brightness. Still this is a nice way to save an out of warranty laptop. What i would do though is to find the data sheet of the display ( in internet) and trace the signal to the board. Cheers from Germany, mate!
Would it be possible to fix that issue (reduce the strength of the bluelight) with screen software like "redshift" or "f-lux" maybe? They adjust the strong blue light at least if they would still work with this workaround.
thank you Sorin it works, pin 5 and 6, appreciate the work you've shared ✌✌✌
I have the exact same laptop with the exact same issue, worked fine for a few minutes on its own, then stopped, I shorted 5-6 and it works
What about the brightness can you adjust the brightness o no
@@mikeyan7312 full brightness all the time, but it can still shut the screen off for sleep and hibernate
@@dstorm19 ok thanks
One of your best Sorin .
A very good job - very technical finding that short
Sir What a great tracing. Thanks lot. due to u i learn many thing everyday. Bravo ur patients of work.
Thank you sir,I learned a lot from you though I haven't fixed mine yet!Ribbon lock stocked closed can't be opened to reach the graphic card.
Hi..that's amazing...can you please upload a video of the same problem but laptop has inverter?
Хах. Був схожий випадок і теж з Lenovo. Одразу як приєднали нову матрицю все запрацювало, але після вимикання - не робила підсвітка. Я трохи глибше занурився в цю проблему і виявилось, що підсвітки не було бо чомусь яскрасість була встановлена нижче мінімального значення в біосі. Просте скидання CMOS вирішило проблему.
Amazing stuff...thank you 👍👍
GREAT VIDEO...IM HAVING A SIMILAR PROBLEM WITH AN ACER....I WILL TRY THAT TECHNIQUE TO SEE IF THE PROBLEM IS SOLVED. THANK YOU SIR
Sir, I am very hope full, your are teaching very nice nice nice ( I am Bangladeshi) English lenguase is problems).....Thank`s Sir...
Thanks for sharing I faced the same thing last year, but for different brand *****ba.
good job, love your videos very educationals and practical.
great job
Absolutely fascinating !
Great job Sorin, if you hadnt been able to fix the issue how would you have dealt with the customer ?
Seamus Gorman what laptop? No laptop here matches that description.. what's your name again?
Bloody Awesome!!! Thumbs up!!
Second signal is missing because of the ribbon cable or connectors. Changing the cable will solve the problem
good job
Having trouble repairing the backlight too, on samsung laptop with 15.6 screen. At first it has blown fuse, then found a shorted capacitor, after removing it i jumpered the fuse, then the backlight is on for about a minute then goes out again. Now having the problem where to search, 3v and 19v are present.
Thank you Sorin for this great video :)
Thanks for
Good Tip to Screen Light Problem
Fast solve , But if we short two pin ,it may gave more amps on that line ,any problem to power variations of full brightness
With all your respect sir
May be it a bad cable
thank you sir...another lesson..
Superb!
Great job
thank you for the info .. you are the best....
I didnt see you trying to raise the brightness and i think that was not a problem at all but a lowered brightness or a bad connector and the motherboard side!
Coudnt you just bridge those two smds ..like you did on the screen connector? So you would get 3. something volts and maybe the screen brightness could be adjusted? By the way...great channel,I am learning alot from you. :) Keep up the good work! :D
MAybe a dead resistor on the main board. I have a similar one with one a text cursor on the top left corner of the screen, no boot, y can get into bios setup. I try reset bios and EC take al periferials appart and nothing. I thing maybe the EC or the bios es faulty.
Are you sure this is the solution to the problem? Mr Sorin, Mr Sorin!
Many thanks
thank you for this video. I have the same problem with back light. But my laptop is Lenovo 100 15bd. will this method work the same?
Interesting but why could you not find out more why it is not sending the signal.
Also can you do a video showing how to fiix the brightness level?
did you check the backlight en signal ?
great video. thank you!
Genius.. goood always
Possibly lid switch problem?
Great video as always but If it is the pins at the cable and the screen is brand new wouldn't you check on the other end of the cable motherboard side to get to the root of the problem? I told my friend I would fix his laptop a Acer Aspire E15 with a LED screen and he dropped it and it started displaying a dark screen so it looked black. I used a flashlight on it and I could see it working but a very faint screen (looks black without the flash light). I checked the HDMI output and HDMI worked fine with everything coming up normal. I figured the video chip was good. So I bought a new replacement screen and it did the exact same thing. I then purchased a new screen cord and replaced it and same thing. Any ideas on what it is that is causing this?
muzicmax G
Hi, Did you find the problem with your screen? I have almost the same problem except the screen is grey, but it displays pic over HDMI.
No I didn't find the root problem..I don't have the equipment to be checking the pins(connections) on MB side..I tried a new screen and a new cable but that resulted in the same conclusion from where I started. After hours of searching on You Tube and having asked everywhere and someone told me it was the back light on the screen. It can't be that; as it does the same thing happened on a BRAND NEW SCREEN and this model does not have a separate back light control module on the case. I gave up unfortunately and he uses it with a HDMI led external screen. In your case however it does sound like it is a screen problem and you should try replacing it. I bought mine off eBay (cheap) and ended up returning it.
Good Luck!
What is there to check on the motherboard side? If he has present 19v and 3.3v on the pcb of the screen, then surely there is 19v and 3.3v on the MB side. Can you tell me what is the screen model? It is at the back of the screen, on the sticker with the qr code or something. Or full laptop model name. It has to be the backlight itself or an inverter but since you replaced the screen with the new one and said there is no "backlight control module" on the screen, the inverter pcb has to be somewhere hidden or something. Sometimes it is separate from the screen and those kind of screens are selled without the inverter as I'm aware and you have 2 connectors on the screen. One for the ribbon cable for the screen and one for the inverter pcb. If that inverter pcb is broken, no screen will work. Backlight is just LED diodes.. You need to find and inverter pcb and fix it or replace it. May be just the loose connection. And to check the voltages you only need multimeter which is like 5 bucks for the cheapest ones which are good for your need.. My advice is to get the multimeter first and check for the 19v on the motherboard and on the screen. If it's pressent then it must be the separate inverter pcb somewhere. Also there is the possibility that the screen you bought was also faulty.
Hi, have you ever had a Lenovo y500 to fix? It seems these can't switch back on after the battery completely dies and forums all mention that they returned the laptops using the warranty.
hello, can i ask you something, how to calculate the smd capacitor value and smd resistor value? how do you know which one is the right one to replace it to your motherboard?
Mama super video
Ist the lcd flex i had the same problem i open the lcd cable and i saw a broken tinny cable fix the cable and done
I had the exact same thing happen to me when replacing the screen. This seems to be a common problem with Lenovo laptops. Backlighting goes out with simple screen replacements. Design problem???
I think so.
i have 2 lenovo laptops all have the same problem on the screen.
replacing the flex cable and new lcd didn't solve the problem. and I think the problem lies on the motherboard side.
now i don't trust lenovo anymore.
alright,,,,,,,another nice video actually all of your video....excelente,,,,,superv thank u........more knowledge pls,,,,,
master technician move....
hi, i have a problem with black screen after replacement a new screen. i had a cracked screen on my lenovo w530, i bought a new screen and exchanged it, i damaged the display cable, i replaced with a new one. but now my new and the old display is black, very weak can be seen the desktop, it stays almost black. Maybe you can help me or have an idea where the fault lies
. thank you very much
yes we learn something useful again here XD
I have a laptop no screen at first and went to clean fan reflux cpu them got no power. One chip is getting superhot!
Stressed out here... What's the solution?
backlight en signal should come from motherboard. so you should check it.
thank u sir.....
Ajutor , i replace the mobo. and the black light stop working ( the old mobo power up but frezze to bios in 10 sec )
How you confirm that is coming 3.3
Why didn't you check continuity across the cable? And why not trace it back to the motherboard? I think I would rather give the customer back a properly working pc.. that backlight being at full bright will cause the battery to go dead faster.. not saying it's a bad video or a bad fix just that this fix should of only been done when there is no other way..
is never the cable, actually is a super io fault
Hello iam arabic job France your vidéo I inderstend to dix non laptop tanks for your explications and pléase how I do to get shema for télévision thomson in internet please help me give my adresse my émail yazidmerimech@sfr.fr tanks men
Merci
hi guys just wanted to ask if is it normal that after you power on, i check the 3.3v of the lcd in the motherboard it is there but after seconds it disappears i mean 0. just to mention i have no lcd cable and no lcd attached. please i do really appreciate if someone would help me..
Hi, i have Lenovo T470s and the screen was scratched, so i've decided to replace it. I've removed the old one, installed a new one, but as it turned out it was the HD instead of FullHD, so i put back mu old screen, but there's no backlight & i can barely see Lenovo logo at startup. I put the new one again, and this one is also not working any more...Any thoughts? Thanks.
I faced the same issue, were you able to fix it?
@@HMubaireekUnfortunately no, apparently some chip on motherboard is gone and has to be replaced 😔
What 's name of microscope sir?
hi,maybe you know where is problem :) , so when i switch on my laptop,graphic card and processor after maybe 3 seconds still very hot and board switches off.i have no idea where was been problem.thanks!
Did u try cleaning the fan,heatsink and adding new thermal paste
thats no problem,motherboard already taken out of my laptop and i try find problem,so when i switch on my motherboard without cooling system i see processor and graphic card start too hot to fast ,but i dont understand why.
without cooling system, GPU/CPU gets hot within few seconds... it is normal.
Actually, I cheated.. I looked on Google for 40pins LCD Connector Pin-Out and it was Pin35 for PWM Dimming, Pin36 for LED Backlight On/OF, Pin37 NC, Pin38,39,40 for 19v.. 😀
The PWM is missing.. if you short it to Backlight On/Off, the unit will lose the ability to adjust Brightness up/down
Interesting
y u can't upload latest vedio...pls sir update new video....how can I contact u
I have a photo but how do i show you? Haha
hi sir i have laptop lenovo g50 no power ineed u r help can u pls
In this line of worck some times it just hapens
Didn't have anything to do with the motherboard - the short was on the screen - I'm surprised about that
Its a boost circuit not inverter. Dont inverters convert DC to AC? LEDs use DC.
Jermaine Ortiz inverter circuit is for back Ac from Dc
Regulator for dc
I fixed mine by holding down f12 button whilst switching on
Happens to me often as my cat walks over my keyboard
Nice but the screen is new the problem should not be from it I didn't understand anything from this vidio
Maybe there was problem on the connector on the motherboard
I guess one of the pin of lcd connector on motherboard might be damaged hence not able to supply current on that particular point therefore providing the supply by bridging