HP 820 G3 laptop - No backlight and a dead battery - Can we revive a dead battery? :D 

The BMS of the battery has many software protections like "permanent failure if is over discharged" or "permanent failure if cells are unbalanced", doesn't matter if the battery has only one cycle of charge. To reset this internal flags you have to connect the battery to a specialized interface available from the manufacturer of the chip (Texas Instruments), or I2C on a raspberry pi, run a I2C address scanner, find the I2C address, and login into the battery with a password known only by the manufacturer of the laptop. That password is used as a key to communicate with the laptop and guarantee that the battery is genuine. The protocol is something like this: The charger IC from the laptop is sending a random number to the battery, the battery encrypts the number and is sending back a 20bytes digest. You can sniff the communication, but the password is 16bytes long and the random number is encrypted twice with SHA1 algorithm. A brute force attack will take more than 10 years.

Sorin, I think you should sign your name inside every laptop you repair. You are famous for doing a great job and, this would add value to these laptops and everyone would want one. "Repaired By Sorin". Just a thought.

the thing i love about this channel and you Sorin is that spark in an eye saying "what if" and "why". this is a proper reason i watch those repair videos, i am the same. it is inspiring to see someone going extra mile just to satisfy his curiosity and just as you said thats how we are learning. great stuff

Sorin: Good to see another video! Regarding the battery not charging; I recently fixed an Alienware laptop that had the exact same issue. The battery would show as taking 0mv of charge in BatteryInfoView, but the battery was nonetheless recognized and it had capacity information and all the normal stuff you see when a battery is connected. Only issue is that it wouldn't charge. That was until I found out that the power MOSFETs next to the charging jack were possibly faulty. Removed the two MOSFETs and discovered that one of them was showing resistance of

I always feel pleasure when I watch your videos, you are a real professor, and I see the many years of experience in your videos. You are really amazing.

Great video Sorin. There are those that will just replace the battery. Then, there are those that will investigate the issue, knowing the battery is dead. That's the difference.

The best sound system I ever heard in my life was a Bang & Olufsen system,and this laptop has that I am impressed

Thanks you for the class, master Sorin!!!

Fascinating.. thanks this was very instructive.. I always learn something new here..

Waw nice one sir glad to see back again

"that's how you learn: you ask yourself, why?" That's true! love this way to learn !

You don't need to apologise for not posting videos Sorin. Don't get me wrong, its great to see you have new videos up but I'm sure I can speak for many in saying that we have learned so much from you that we can't ever complain. But you shouldn't feel obliged or it will become a chore.

Hey i am from Swaziland 🇸🇿 been watching ýour videos from some time .you a inspiration to me and my students

You are dr. For all this elec. Repairing guys and i teach so much from you,i want to tnk you for this videos

will be a fantastic journey!

Good job mate.

It would have been interesting to see what your Laptop Battery Analyzer would have shown.

30 degrees is not hot for me😅.. Over 35 degrees is hot. Nice video.

Good job thank you!

Sorin, you showed before the battery analyser tool. If you go on the forum for it the makers of the took will help you reset the battery BMS for a small fee

I have the same issue with an asus battery i made two holes to reach the cells and charged it with a psu but laptop won't turn on, the thing is that it's very hard to get inside for the board without breaking it and it won't charge as you've shown, thank you for sharing. btw there's no worse than hot weather combined with high level of humidity

I was glad to hear say ordered new battery. not worth the risk especially if its for resale in you store

That Elitebook has the same 4 front LED indicators (Wifi, power, charge, HDD) on all HP Business laptops since the acquisition of Compaq up until that laptop, and even on the old Compaq models like nc6220 nc6400 6910p, when the battery LED comes on amber and then shut off, the battery (BMS controller) is toast (while amber means charging, green/white means >= 90% charge, and then off means fully charged). Even on those units it's impossible to revive the controller for the same reason. But if you do have an aftermarket battery instead (many with no permanent failure flags), then most of the time just charging the cells up and make them reasonably balanced will revive the battery and it will work once again, or if it is critically discharged but not this crazy (at least like 7V), they will just charge the battery anyway and it will work. This is how I got working old aftermarket batteries working for old Compaq/Elitebook models. Note: Pavilions never used this set of indicator codes, and their meaning and location changed all the time.

nice to see you👍👍👍👍👍👍

After Louis Rossman you are another repair guy who is getting my attention.

You are exactly right, this is how you learn. Ask why why why. 😃

I once open one of those bateries and check the board. There as a large and strange fuse inside that was open. Shorting the fuse made instant smoke. Then I gave up on it :)

Thanks sir fixed mine myself almost gave my laptop to a technician

It's been a long time. Good to see you.

Nice attempt !

Hello Mr. Sorin , i wish your videos were more compressed . I'm on a metered connection and your vids are big . Btw I like to watch from start to finish , specially the big ones .

Missing those Friday workshop flow.

Hello! From my experience I think that the charger is good for turn on the laptop but can’t push the voltage to the battery. You need to verify the charger.

Hello sir good day to you. I have a suggestion on the last part why didn't we just replace the battery first before we did some soldering so in that case we could have focus/ isolated the problem. maybe its really in the battery. Im a fan here in the Philippines also a technician im not really good in electronics tools like tester or etc.. What i mostly do try swapping the parts first just to make fast on troubleshooting. But again another great video god bless you sir and share us more of your experiences.

that was good thanks :)

I almost waste my time on one, thank for saving me ☺

Would be nice to have a reset option on battery if cells are recovered but hp won't do that until customers start throwing their dead batteries through hp head office open windows.

Hello sir i wish if you can learn how to reball a cpu i m happy today to watch your vedeos after 4 years

I love the movie I learn something new.

I deal with MacBooks. I astonished how easy back cover is removed in HP, no idiotic clips that MacBooks have. Also the screen is so easy removed, in MacBooks it is all glued and connector is soldered to the screen under a glue as well

Nice video Sorin, I have problem with same model, it freezes when OS is loading or a few minutes after OS start to running, I have replaced SSD and memory but seem to bee something motherboard related. :(

Hello before you open the battery first look on battery and motherboard connection, mabe there pins have free space on battery connector (try to push not hard every single connection pin and battery using small + screwdriver ) sorry for my english :) pozdrowienia z Polski

Usually BMS resets by connecting battery voltage to output pin

Hi Sorin why did you not try revive battery with nlba battery analyzer.

Hi am ukesh.s Am big fan of you sir ur videos are very informative keep rocking with love and support from India, chennai🔥🔥🔥🔥🔥

Please sir tell me about hp laptop adapter 18.5 volt .in this adapter is wasted.i want to question i have a another adapter 19.5 volt. I can use this adupter. i mean 19.5-volt adupter.

In India (churu) this summer temp40-45°c

Hahahaah. Let’s put a wire. Boom lol. Thier gettin smarter now Sorin lol. Love your channel.

Am working on hp elitebook 840 g3 . the problem is , it can only turn on when i put in charge battery but not on charger. if i plug in the charger all the necessary voltages come , but still cant switch on from charger

bypassing the protection? Is the protection not there for a specific reason?

I have a dell inspiron 13 7000 Series it was working well a few days back now the battery can’t charge when put it on it shows Ac adapter unknown can’t charge the battery it will match the power with the performance of the machine when you click on the continue it is very slow can’t do anything I thought it’s the battery. I tried another battery same thing, then I tried changing the charging port it’s was still the same, I even changed the Ac adapter but nothing changed any help 🙏🙏🙏🙏

I have a strange error in my laptop it sometime goes "On" but sometime it doesn't and shows amber and white light pattern which is symbol of cpu failure. Can you help me please 😭😭

I have same laptop but it's a power issue ⚠️ can you to fix it virtually @sorin

Sorin you forgot to detach battery before disconnecting screen connector. You've been lucky not to damage anything 🤔😁😁😁

hi Sorin...¡! have a nice day...! from Argentina...!

maybe you raparred the output ligne of battery and the mosfet that control the input ligne is still blocked

I just want to know why? 🤔 Why? 🤔 That's a great question!!!

Back to work

Saut Sorin ma uit de ceva timp la videourile tale , am cumparat recent un laptop asus rog strix si din pacate laptopul porneste dar nu afiseaza ecranul am incercat si hdmi dar tot ni merge , locuiesc in londra cum as putea intra in contact cu tine daca poti sa il repari

where is the battery analizer?

I tried bypassing the mosfet but never got it to work

Where in the Uk are you based ? May i ask Antwhere near Birmingham?

Interesting and educational video. However, please do not play with defective batteries 🪫

Ive already ran into 2 BRAND NEW Gateways with the same problem that HP has with the battery and if you smell that battery it has a sweet smell to it and the first thing I noticed was the mousepad where the battery was mounted was Rising up for no reason so I took the laptop apart and the first thing I observed was the thin plastic wrapping around the battery pack had filled with compressed air which was pushing upwards on the mouse pad 2nd thing I noticed was a sweet smell coming from the battery pack 3rd thing I noticed was the battery voltage was reading ZERO unplugged but plug it in it would charge completely up in 10 minutes then go dead as soon as I unplugged the charger Replaced the battery ALL Problems solved

How is that laptop running Windows 11? It’s sixth gen, it’s not supported on sixth gen unless you do some hackery

Hello guy, you have the schematic for Aorus 15-X9

Hi sir watching here sending full support

Hey, I'm just starting to get into making soft and tNice tutorials 17 minute video helped a LOT MORE than those one hour long tutorials out

Curiosity killed the cat. Dead, Fried,🐈😂

Trick SuperIO

I am so sad this battery is dead .. i dont know why :)

dont even soft like anytNice tutorialng, was that a problem for more experienced people here as well?

Proper Hot ? 30c ? U wouldn't last 5 minutes in Australia lol

What happened to your " . . .gold mine. . ." "Pro tool - diagnose, measure real capacity, revive, charge and discharge laptop batteries"

the temp here in UK is very high even today is like 30°, are you fucking kidding me Sorin ?, here in Africa reached 49°, if we got 30° here we wear jackets, 30° he saying hahaaa

I had a similar laptop but the battery was 18650 cells, would say fully charged and recognised but when you powered on it died almost immediately and would register zero again. So I opened it up to find 2 of the cells had leaked acid. So it was thrown in the bin, was a nice experiment but not viable to buy individual cells. Good to see you back on again.

Unbalanced batteries --> reverse chaging

Why why he breaks 🙈

Maybe you should analyze the battery using the NLBA, since you already have one... right? If the cells are still good, maybe only the BMS chip needs a reset...

At the time I am writing the comment, the temperature reads 48 degrees Celsius (yes, dear, it is Iraq)

If you are interested in laptops for parts that you can fix and make a profit let me know. I have high end and low end laptops that need repair and I offer them cheap.

Why didn't you use the NBLA battery device you was sent by NIP Embedded

Battery serial data not getting to the super io ? Well done with your passing the ham licensesorin , i'm not supperised :-D

30 degrees celcious that's nothing. here it' been being 100 farenheit with a heat index of 110

👍🙏🧡💚

First to comment 😃

I don't buy HP anymore. Garbage laptops. No clock backup batteries these days. Lenovo much better brand now. I have resurrected lithium cells in the past by charging the battery behind the protection circuit; once it has some charge the protection circuit will then allow it to be charged. Seems when batteries are empty the electronics won't let them be charged, and it an issue when batteries have run right down and not been charged for a long time. Have also had batteries puff up; in this instance I have put a pin prick in the plastic bag that the battery has been sealed in to release the gas buildup. Then its fine although you might might get the occasional wiff of the gas through the pin prick!

That’s a Sorin movie breaking the battery smooth with a garage toolbox. And still not working aaah but we know it’s a very 💀 dead battery 🪫 thanks again