That was unbelievable you should take pictures and send them to LENOVO so they can see their sorry engineering work. Sorin your the number one electronics engineer.

I'm watching this on a Lenovo e520 where nearly every part has been replaced and can be replaced. Lenovo used to make decent laptops with proper keyboards, cpu and memory sockets and batteries that can be changed without opening the case. Alas, no more and I will never buy another laptop from any manufacturer who makes the hardware unfixable. Great Video Sorin.

that lenovo board and the entire laptop, the way they easily bend is criminal. Thank you Sorin for this eye opening video

What pleasure to watch you succeed - I gave it to you fully. Master Repair

On some laptops there are "configuration resistors" who instruct the PCH to use the integrated RAM or not. Information about how to configure the system RAM by placing or removing the resistors can be found on the laptops schematic pdf. You can enable or disable many other functions of the laptop by placing or removing some resistors on the motherboard.. functions like debugging port... LPC port, JTAG port, installed RAM, installed GPU, etc. The EEPROM chip contains Intel proprietary code as well (Intel Management Energie, driver for the NIC chip, etc), not only the BIOS who is proprietary to Lenovo. The BIOS chip... what it use to be in the past is a Pandora box nowadays. That chip contains multiple images... like iso files, with partition and files inside, all well protected with many RSA signatures, one on top of each other (the security ring). So if Intel want to spy on you, Lenovo will have no clue about that in their own laptops 😉 If you have time to read about ME section of the BIOS you will find that there is code (some hardcoded into the PCH) that is executed without any RAM installed at all, all proprietary to Intel who can run with only the CPU L3 cache as RAM, and that code can use the network card too.. while the laptop is powered off (All this information is from the Intel official site). Intel implemented this system to protect you and your data if the laptop have been stolen. There is a 3rd company who collects this data... is a long story... Personal Computer is not personal anymore for a long time ago. For usual consumer there is a version of the code: about 2Mbyte, another version for corporations laptops: 5Mbyte, and no version for military grade laptops 😉. They don't care about the military safety 😁 So.. if you really want a nice laptop.. buy a used one from the military 😉 And hackers are just scratching the surface of the security on that chip. This year some hackers made public some RSA keys stolen from Lenovo and MSI witch make possible some modification of the BIOS (at the same time can make any malware to run as OEM BIOS code, and if someone can sign a EC image as OEM they can transform a laptop into a bomb. Yes, charging voltage and current is programmed by the EC into the charging chip by a secondary I2C line). So writing unknown code into the EEPROM chip can be dangerous... and this lets us with no way for fixing laptops anymore.

It is very rare to see sorin angry, although he is angry for good reason

That was very educational, I really appreciate it. Even if I doubt i'll ever desolder RAM chips, I'll definitely have this in mind for modifying BIOSes

You're wonderful I've NEVER seen you get upset. Love it. Been watching for years. Thank you.

Thanks master Sorin... You really do create inspiration to get things done.

Hello Sorin, like me anyone who watch your video must admit that you have so much patience to repair anything with your precious time & you really are a green man. Hats off you 💚

Great job Sorin. I would recommend using virtual machines for running potentially malicious software though. That saves you from sacrificing your OS and you can easily make clones of the clean image before starting to experiment.

this was very cool and interisting !! thanks ! I ask kind of same question in the coffee chat. It confirms why myne did not boot after remove a few modules. (because of the bsod)

This is right to repair! Again great video!Thanks a lot.I wish to see repair of an old laptop

hi professor sorin am Albert mulad from Nigeria. am amazed for that great job u did!

That was brilliant Sorin. I have a friend's broken Carbon X1 with the same problem. Reflowing off course did not work and I was stuck. I will totally try this. Thanks! Lenovo is in my black list. i used to recommend it to friends and family, but no more. Crappy flexible chassis were bad enough, but sabotaging repairs is going too far.

Wow, what a nice repair.. Some technician would say it was a graphics issue and then retun to costumer and pay them with there service with no fix😢😅 ...thank you so much for your hard work sir ... HELLO SO WE ARE BACK SO THIS TIME WE HAVE A BAAAAD ENGINEER LAPTOP 😅😅😂

An exceptional repair , thank you.

Wow sorin you are so funny. I enjoy watching your two hours video because you mix it with fun.

THANKS FOR THE SUBTITLE IN SPANISH YOUR VIDEOS ARE VERY HELP TO BE ABLE TO UNDERSTAND MORE THANKS

good lesson even for experienced repair shop i like your stile and i repair electronics for the last 20 years

looool 😊 He always improves the circuit of notebooks!

Great Video! As soon as I saw that glue, you know what they are up to - they don't want it to be repaired & do it so it would not be cost effective to be fixed by a repair shop. As you said - Apple is the same. Best way to deal with it is not to buy those products. Samsung is another - almost as bad with all of their products too. Consumers have the power to put an end to these throw away devices by doing more research before they buy them & become educated about these sometimes 'cheap' devices before they spend their hard earned money. So glad you came up with a workaround & showed how it's done.👍

Your repairing works all amazing sir 👍

Sorin, you are a genius 😊

You are right about many things Sorin, particularly regarding the selective concern for the environment, climate and green issues. Net zero is indeed a sick joke when we consider how manufacturers only prioritise sales over repair. Great repair and your videos just keep getting better and better.

Thank you for sharing high-quality maintenance knowledge with everyone. Upvote for you!

Nice vidéo, THANK YOU very much ... Good to see you next time ( I really appreciate it )

Hello Sorin, thank you very much for sharing it, and I agree with you, it is one more way that manufacturers do not want equipment to be repaired, only to sell it and that the warranty and battery last just as long. Thank you

I seen glue shorting the "Power On LED" on a new high end laptop, it was clear glue so i could see it getting brown from arc, i cleaned it and the laptop worked, i was lucky to notice it before i started testing etc,

Thank you so much. This is really valuable. In regards to the program, it´s probably a false positive. I´m astonished by the amount of software that I use that triggers my antivirus without ever destroying my system.

I never SAw angry sorin before. Thanks for showing us the trick.

Great job. Thanks for sharing.

Great video!

It was crazy, excellent job

Great video.

Thats not angry. When angry you will smash the screen with your fist. You are a gentle giant. Thanks for sharing.

You are really the master bravoo😊

You get lots of repairs from other shops. That’s amazing I would say

Hi Sorin great video . Never seen that program you use.

Lenovo should hire this guy. He is the best

Thank you for the continued sharing of your knowledge and insight. The only option we have as consumers is to not buy Lenovo products in the future. I will never buy or recommend anyone buy Lenovo products in the future. Regards

I have two Acer laptops with onboard ram and an unpopulated NVMe slot each, without the port soldered on. When I was learning how to add the port I also learned how to disable the onboard ram. It turns out these Acer laptops can be configured with resistors. I can move one resistor and essentially tell the motherboard that there's no onboard ram, and that there IS an NVMe port. Iimagined it would be the same procedure for this Lenovo.

Hi Sorin, when downloading unsafe software you can run it in a virtual comuter, for example in Virtualbox, so you don't have to reset your computer after using this kind of tools.

Master repair!

Glad to see more people figuring out what manufacturers are doing! They 'claim' to be 'green', then engineer and manufacture POS that have to be tossed in a year or two. I had this figured out years ago along with others, but more need to wake up to this fact and force them to do better.

wow! wow! wow! That's great sir!

Dont forget about the the best Lenovo power socket (yellow square one), this is another dishonor they still put to the new laptops, when half of the laptop repairs channels on Yt point finger at it. Every manufacturer has its sins with cutting costs etc. but what Lenovo is doing is just out of mind. Sorin, much appreciate for your work, you make this industry better with every video. Great respect and greetings from Edinburgh.

with all the right in the world you got angry ..but you succeed and very nice done

Thank You Sorin!!!! I have a Lenovo Yoga c-740 with soldered RAM. The screen had lines and shit just like in this video. I took mine apart and sure enough I see that fu k'n black glue on the solder. I took a chance and used a hair dryer on the ram chips and heated them up and applied pressure to reseat them and it worked! Thank you I was about to scrap my $600 computer. I'm wondering how long it will last?

Hi Sorin you can use toluene or epoxy dulient to remove the resin it will take about 5 to 10min to get soft ...

Spd tool is good i have used it so many times but i know how to edit bios also for onboard ram disable. Or there is a another way by removing/adding termination resistors and this is the only permanent method. The way you dont it, it will come back once customer update bios via windows update.

That silicone glue can be removed by some solvent like white spirit, or cellulosic diluent , it not melted but easily detached from the surface…

Hi Sorin. One of your most informative videos. Thank you! That tool looks really useful. Do the RAM chips have to come off for the BIOS hacjk to work? I'm guessing yes as there is a fault but maybe not? A lot of laptops don't have a DIMM slot any more so this wouldn't be a fix. Lenovo are sliding into making real cr*p stuff now but so do all the others. Bendy laptops that are just not going to last and so cheap are hardly worth repairing. I still have a Lenovo Thinkpad T410 in the boot of my car for on-site work. It's from back when IBM designed them. It's been dropped many times, covered in building dust, rained on and when used, covered in condensation from the winter it still works! I'm sure it'll give up at some point but one of the most reliable tools I have. I've been through 3 drills in the same time I had that Lenovo.

Nice job extreem High Tech this time... replace the was not a option but very interesting video thank you....the repair Master.

Sorin Rants are The Best...Lenovo This Laptop will Self-Destruct..

Maybe the black glue will dissolve with acetate? It would be interesting to try on a scrapped board. Otherwise you're going to have to keep a virus riddled laptop with no wireless connectivity just to do the BIOS memory trick. I think you're right about laptop manufacturers trying to stop us repairing their laptops. Originally it was all about preventing laptops being stolen and hacked but now they are going way beyond just trying to improve hardware security.

Hi sorin what is the ic part number of PU401 in this board I got the same board where PU401 in burnt condition

Very great video Sorin, Is bad that manufacturs go on with the unique law they know... the $ One, but web web must go on fighting the

You should use it in a virtualbox so you can avoid reinstall windows in the future. Anyways, love your videos Sorin. Good luck.

You are Right !!! At Always,....

It is not the right way Sorin but it works fine (if the customer does a firmware update then the board will search for soldered ram hence no display) 2nd way is to use schematic and disable on board ram by replacing resistors . For the tool I would suggest that just search for JDEC DDR 4 specs and take couple bits, search them in bios file replace with 00 and done (that's what the tool is doing the doggy way. )

thanks man,,,

you work so quickly…forgive me, i do at times get left behind in what you are doing & why. but you inevitably come up with a working laptop - quite amazing. and good learning about inside of laptops. re the black adhesive on all chips, i’m trying to think laterally & think what other possible reason the manufacturer might be considering to justify that action in a positive (not conspiracy theory) way? perhaps he thought under impulse g forces, chip-board stress reduced, so solder joints, especially any inferior ones, are less likely to fracture, resulting in a longer laptop life. any repair implementations were perhaps never considered or seen as secondary, given the life benefit. of course this is all hypothetical & subject to proof by testing. my feeling from my years in electronics industry is flexing/resonating boards, leading to broken tracks and solder joints - pose the greatest risk (based on a gut feeling….admit i’ve never done any theoretical analysis or statistical tests) & using a thicker board material is good start. it’s an electromechanical issue.

Excellent, not knowing how to solve this same problem, I ended up buying another motherboard

The master 🤝

Bravo , "nenea" Sorin !

Nicely done Sorin, but keep in mind, either mine or your solution, they will not survive a BIOS update. Take care

It is interesting how you said that you didn't see any laptops with memory issues for years. Actually all the issues I had with laptops, pcs and even one wheel balancer machine for past ~10 years were only ram related

What were the tools, both hw and sw, used on the bios part?, I didn't get that part

I enjoyed the well-deserved rant 😂😂😂😂

Low melt solder on pads. Wick off the solder and scrape under fill at 230 degrees hot air. Reball chips with stencil

this is F***ed up on so many levels... i bet the glue expanding due to heat is what must have caused these RAM issues in the first place !!! As usual, great job by Sorin. And cudos for your patience. At least we know what manufacturers to avoid buying from thanks to your sufferings :)

hyper visor is for virtualizaion. You will have to turn on virutalization on in the bios inorder to use hyper-v.

Nice 👌

Kindly speak about folio 13 - 4000 screen and if it's possible to put normal screen

The only model of Lenovo laptop that I recommend are the Thinkpad models, it seems that all of their other models are made with cheap materials and are designed to fail easily.

sir i am interested with the tools you are using to rewrite BIOS the one that you plugin to rewrite BIOS.

Can you use the G-450 to remove the glue?

What happens if there's a bios update in the future?

The glue is like life support just a engineer strategy 😅

hi. how can we made bios (modify bios whitout ram) thanks

This is why I do not buy Lenovo laptops for our company use. Thanks Sorin for sharing knowledge.

I wonder if we can use modified bios to disable proprietary gpu and use built in intel gpu. This probably could solve the problem of dead gpu.

Does the memory chips need to desolder or you can just use this tool without desoldering?

that's why I avoid lenovo at any cost and I was one of the few ppl that kept inisiting to not get any lenovo laptop when I was an IT, it took them more than a year to get a new contratct with HP

Maybe just take a look to schematics to find where to disable onboard ram using one or 2 resistors :)

Interestingly, Razer also uses what looks like red glue on their laptops and it's under almost every chip on the motherboard. Was wondering whether this is in order to prevent solder joint cracking due to thermal cycling, or if there's another reason why they use it.

I feel this one, maybe the attention to right to repair will change something? I mean its already starting, we see framework f.e. but I think we need regulation by law and framework is a prime example that it is possible even without the amount of financials and workpower big compainies can use

Would this tool to disable the onboard ram have worked even without desoldering the memory chips??

but how do you know if the new bios is safe?

Pls how to get the software to disable ram on bios

muito bom

Fantastic fix. However I've heard windows can now download and update the bios and you can bet lenovo will push a bios update into bios. Might wanna make windows ask for manual updates.

the black glue is factory! not added by previous repair atempt. is used in laptops and phones, colour might be read or another colour sometime!

lol wait till you see their updated sickness on the newer boards.. they removed the slot completely and used onboard ram on both channels ! glued of course 😂

After "water damage" now have a "glue damage" or "Assembly Damage" coming soon! ehehehhehe incredible!

Hi, help me please I already download (bios memory spd removal tool) but I can't found the bios update, please help

You do not have to sacrifice anything in order to use the software. You can just use a virtual machine with a previous known good state saved, and after using the software, you just restore to the old state, and virus are gone. You can also use's Windows 11 Pro own sandbox or Sandboxie.

Sorin I love the aggression, it’s well Deserved. Your right, they are pricks !!

“That’s crazy, that’s sick!” That should be on your merch I would buy a shirt. Your face blowing vape smoke with the that saying right below.