Reflowing random IC's, can be called a fix? The laptop screen technology, is changing! Lenovo 720s
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- Опубликовано: 5 фев 2025
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Nice one Sorin. Hopefully the customer has access to his Bitlocker key lol. I've had a nightmares with customers and Bitlocker keys. 😅
Many thanks majmune (meant as endearment please don't get me wrong), I have learned a great deal from you and wish you the best. Gott mit uns!
Fair demonstration think that could be common on Tablets, just brought three of them with screen crashed for ten euros. Two are Ipad, lol, one is a 11'' from Huawei, will see what I can do if it's possible to repair for my apps for synths with the teaching you made by past about tablets. Mine I learned about battery locked, not charging and relation ship between charging current and amps needed. Also usb mess as everyday I plug and unplug the USB c, that's actually the fourth cable I buy. Helpfully, a light on the cable indicate when it is not charging well. The last screen I opened seems having no problem, but I will verify the three currents like you shown, but first I have a oil liquid damage through the left loudspeaker to the screen connector, one component is damaged the board seem's working, no short anywhere. 🤗So I have a New job! This is a nice laptop, brought on the weekly city outside market for dvicy levas in Bulgaria, wich is near ten euros. 🙏🧡💚
Lenovo saw your laptop screen repairs and its challenging you lol nice fix
BitLocker recovery usually appears when you fix (or exchange) a motherboard, or change the bios, never seen it happen when fixing a screen. I mean, the system was on at the beginning of the video, I don't understand why it showed up after messing with the screen, especially in that case, it was just a reflow.
Probably triggered by the bios reset / re-initialize routines. Perhaps because date/time are now off, or during hardware re-detect, it cannot be assured the drive is on the same hardware as it was originally. Perhaps TPM was reset as a result of the bios reset.
I learn a lot through your videos. Thank you
Actually, from my experience working as a diagnostic tech for Digital Equipment and contractors, sometimes this is the only solution left after the bed of nails tester and logical diagnostics fail to fix the problem. Solder reflow on surface mount components can have some tricky failure modes. A good microscope and patience can lead to success.
With Sorin we learn all tricks that we don`t find in books.
Maybe they watching yours video and remove dim signal.Great video.Thanks
If you can’t verify if there’s power being drawn by back light, can you try placing a length of wire inline on the positive side of the display power feed. Then take you new owon oscilloscope and a split core amp transformer (from a small amp meter) . Attach the scope probes accordingly then try cycling the dimmer button? Or just use the scope probe to back probe terminals to try to find the dimmer signal. Maybe oscilloscope can detect when dvom can’t.
Cool video as always!!
the experience had to kick in on this,wow thanks
If You can adjust The brightness, may be taking 3 voltage measurements in both chip pins, at full, mid and low brightness in orden to.identify pwm on the 2nd chip, of course si a lots of time, but just a thought
Trop fort le Sorin comme d'habitude, merci...
Master of electronics
Good job. I have encountered this on laptops where the customer use the laptop with high load but screen closed (external monitor) and the heat from the laptops house is heating the screen. It can even cause the screen to die by heat. My experience that this only happens on laptops where the heating cooler exhales to the screen side. On other models like Asus x55X the laptop even shouts down because of overheating under load.
Try hit combination with Fn + f-keys to adjust brightness. BTW you can have a stick or external ssd with windows install partition on it, and boot from them to make tests. So you do not have to rely on custommers ssd/hdd.
Very usefull to have your own windows on a external storage thing for testing purpose.
Indeed. Portable OS on Flashdrive is great.
Ventoy USB is the keyword here - even working with secureboot enabled and multiple iso files
If a replacement LCD was 55 pounds, that speaks volumes in regards to what the actual whole sale cost of the laptop was is/was new (or should I say what it's actually worth). You are a real Trooper (and a Savior) to a Lot of people. At this point it's still a joy to repair laptops.....Only if it's mine because it's a real crap shoot these days. LOL Thanks for another look at what the consumer is faced with (unknowingly) when buying electronics in today's market.
Salut Sorin
Nu știu dacă are relevanta dar am observat ca o bobina a făcut o basica... cand făceai reflow la cipul al 2.lea. Dacă dai cu o viteza mai mica se vede bine. Se întâmplă la fix 10:46
😂😂
"Reflowing random ICs and calling it a fix?" - Well that is what 90% of repair shops do...
Hello, Good work, as usual, Mark, Cambridgeshire
Thank you!
Good question, thanks for reply
What did I miss. The main power rail is 8 volts. I thought it should be about 19 volts.
Nice fix Sorin, I always enjoy seeing your expertise in action! One question: this panel has LED backlight, so why would it be driven by an inverter circuit? Surely it would just be driven by a DC regulator (with PWM control for brightness)
LED backlight works with something like 40 volts so you need an inverter to rise the main power rail from 8.7 volts (or 19 volts) to 40 volts
On some laptops you can adjust brightness in BIOS.
Skill and luck all in 1 sorin
Just wondering if this is just a Lenovo screen (no dim) mod or if others are going to do same. That bezel is more like just a piece of tape - what crap! My guess is that the reflow is only a temporary fix - these 'cheap' laptops aren't meant to last more 2 years. They probably made the screen that way intentionally so it would have to be replaced. Would be interesting to know how long the reflow lasts. 🤔 Good to see you show us a workaround fix for this fault.👍
you can test adjusting brightness in bios
ATTENTION SORIN:
I found a way to get past the bit locker recovery screen:
1) Boot to the blue recovery screen.
2) When the screen comes up, hit escape.
3) It will show that it is starting bit locker recovery and then go back to a blue screen where it asks to enter the recovery key; don't enter anything.
4) Hold the power button down to power off.
5) Power back up.
It will boot the operating system.
I've done this on 2 different HP laptops.
Very useful ! Thanks🙏🧡💚👌
@@patriciaoudart1508 Also I should mention that you might need to start from a completely powered down machine (battery disconnected & adapter removed) so the BIOS is reset. You will always get the boot locker blue screen whenever you reset the BIOS. After doing the sequence mentioned, it will always boot to the OS.
I'd like to hear from anyone else who has tried this with a different brand laptop. Curious if it works on others.
I think it's essential for repair shops to have a way to deliver the laptop to customer without a blue screen.
One thing Ive noticed lately is that a lot of devices are leaving the factory with a lot of cold solder joints and a simple run of it with my soldering iron or the hot air resolves the issue and the device never sees my workbench again. So yes a reflow is a fix lol
Its not a issue.
Chip is faulty.
This is not fixing screen.
@@NANO-SERWIS.MAREK-DASZKE nope I had the same screen same fault reflowed this chip screen still good after 7 months no issue no one flicker
You can say what you want about screws ... but they're damn handy to open and close things up ... shrinking stuff too much leads to a heap of extra problems
If the Bios is not encrypted and you can boot from a pendrive, then you can test laptops with a Linux Live Distro on a USB pendrive.
Goddamn lead free solder and BGA chips !!! 😠🔥
could osciloscope help here?
there is a little sound in you last videos like biiiip where does it come from
looks like Lenovo is your main client..:)
fantastic
It seemed to be a floating ground issue. Somewhere between the chip and the screen
If a reflow fixed the issue it's a fix 👍
Ma' man :D
@PCXode: Yes. That's right. Excellent response from you. In fact, you have to know the area where you have to reflux. Another way of putting it, it wasn't necessary to reflow (resoldering) the entire motherboard, right? Best regards.
Reflow not fixing the problem.
Issue return soon.
Its is chip fail issue.
@@NANO-SERWIS.MAREK-DASZKE nope I had the same screen same fault reflowed this chip screen still good after 7 months no issue no one flicker
When are you starting your repair course?
Cold solder
hey Sorin, what temperature did you use to reflow the ics on the screen?
+1
350 celsius
@@electronicsrepairschool Thanks! Using Aten 862D?
@@electronicsrepairschool 👍
thanks
Hey man that's the way it is sometimes🤷♀
A lucky ducky 🦆👍
@teslaapple: lol
It’s only a temporary bandaid. I had this putting a GPU in the oven. And the problem would just come back after a week. Sometimes it was very long term and was even able to be sold.
I had the same problem under Win 7, the icons were flashing, disappearing, the start menu stopped. The cause was the bad battery, showing the X. By regularly starting the laptop on battery, leave it to drain, stopped the problem, and didn’t happen again.
Was it reflow, connectors reseated, or just some good luck/magic/voo doo? Win some and you lose some. This is a win
I have the same laptop with the exact same problem. I will try to reflow. How did you close it? Normal double sided tape?
YES - I reflown the chips and the repair was "succesful" .- unfortunately one of the thinghy broke and I had to use isopropil alcool to aid in detaching the screen. It damaged slighly the image but at least now I can see. I can confirm that the method is working consistently
Mulțumim pentru lecție! Poți să-ți faci un stik cu un liveOS pentru teste. Sper că ești bine! Sănătate!
"recovery-fingy", a rubber-stripe is a "fingy", a chip is a "fingy" ...I like this flexible word, I can imagine, what it means, but what is it exactly ..a "thing", haha? (I'm not a native speaker)
Yes - thingy is a thing
Basically is a replacement word for anything :D
We learned🤗 a word!
@@patriciaoudart1508 ..we learned a fingy :D
Hope its not a floating bug, when its problem return sometimes.
Salut,Sorin cum pot lua legătura cu tine sunt în Scoția lucrez într-un magazin de telefoane și șeful meu ar vrea să colaboreze pe viitor cu tine pentru ceva reparații dacă ești interesat! Mulțumesc
That flex on the LCD! Good grief this things almost made out of butter.... what happened to laptop's with actually DECENT construction???!!
They were gone.
What did you use to replace the sticky tapes under the screen? Hot glue? ;)
B7000
@@electronicsrepairschool hi sorin for the brightness control i think that because the computer is in recovery mode that's why it can't change maybe the graphics driver is not enabled on recovery
Maybe this laptop has got hdr screen and the extra chip is for backlight brightness - in picture brightness adjustment or something
Strange fault, but a fix is a fix.
This is not fix.
Screen still having issue.
Its works 1 day maybe 14 day😅
@@NANO-SERWIS.MAREK-DASZKE nope I had the same screen same fault reflowed this chip screen still good after 7 months no issue no one flicker
"I will not say nice". Phahaha! Damn it!
Some have the lucky touch.
Soon you will need to connect the leds directly to the main rail.
I think it's easier to just replace the whole screen :)
Easier to buy a new laptop ;-)
hi can you please help me find key buttons to unlock advanced bios tab 🙏
device model is lenovo L340-15IRH
bad contact on solder.
We need a repair about microsoft surface laptop
that is probably OLED... hasn't got a backlight anymore, the pixels are lit by itself, has no more dim signal, is controlled by the image processor.
newer laptops becoming more and more flimsy causing lot problem for second hand and refurb market. older latitudes and XPS never bent
Yes is a repair.
Has anyone noticed that the last aprox 10 videos are from the shitiest brand Lenovo. All issues are pointed on that brand! Like Sorin said before, it cannot be nice, it's Lenovo..... 😂
👌👌👍👍
For testing in cases with no access to the storage, you can just boot a live usb windows/linux OS.
Unless there's a BIOS password that you should not have
@@TheXlen power-on password on laptop bios should be ilegal lol
@@drinkintea1572 you mean basic security should be illegal?
@@drinkintea1572 I don't see why it should be illegal. In case of stolen laptops you can at least make it a little harder for the thieves to sell it, therefore preventing them from making much money on them. Assuming the thief doesn't know how to bypass the password altogether.
Hello🤝🤯👍👍👍👍👏👏👏👏👏👋👋👋👋👋
E bobina din stânga sus de lângă cipul mai pătrat
Alt+F11 or Fn+F11
Reflow fixed the problem? so the new soldering technology is dodgy. and reflow is the fix for it and nothing else !
hi I want to know, how could I fix the overheating of motherboard.
What do you mean 'overheating'? Describe the issue please
Cracked solder probalby.
haha nice!!!
Flux and boil baby. You know it's right
If its no longer broken, its a fix haha
How about reballing?
What is it actually?
My laptop died
The technician did a "reballing"
He charged me the equivalent of 60 dollars for a laptop that cost me 400 dollars brand new
It worked for like 10 months then it died again with the same symptom
Now the laptop is a paper weight
Noice
They assemble motherboards using a cheap lead low melting point = low cost
Company nowadays prefer low cost to earn more.
I give 6 month ++ repair
And maybe i said a lot time
Lead-Free Strikes Again...
with those very thin laptop it always fixed by reflowing.
we shouldn't try these type of laptops
First ❤❤
Hi Sir Sorin.
Awkward as it may seem I just have to reach out and ask if you may be generous to share with me any one of your old cameras even the worst of them all I will greatly appreciate. It will be a great help to me.