Something is bothering me, this laptop charging current....
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- เผยแพร่เมื่อ 13 ม.ค. 2023
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I worked on chargers at Dell. There is a max current allowed from the AC/DC adapter, say it is 4A, the charger keeps the max current at 4A - it supplies the current to the motherboard, and whatever current is left over is used to charge the battery.
There are also some chargers that charge only the battery and all the motherboard current comes from the battery.
I have measured battery charge currents before, and the max was usually 3.5A, and this occurs when the battery is low. There is constant current mode and constant voltage mode in battery charging, during constant current you can see 3.5A going into the battery.
So I am not the only one that ruminates in bed about an interesting electronic problem... 😅
😂 me too 🤧
Definitely not 😂
I get out of bed all the time hahah 😂 I’m not the only one ! I have to show this to my wife hahah 😂
Another one join the group 😂
Sorin, you can rest peacefully at night from now on after knowing the following: Lithium batteries can 'safely' be charged at 1xc, or 1xcapacity. In this case, the battery is about 4335 MaH, which can be charget at 4.335 Amps safely. Some out there claim it's ok to charge them at 2xCapacity, which in this case is a whooping 8+amps. I wouldn't try this though!!
Sorin thank you for your commitment and willingness to teach others. Much appreciated
This video shows the passion you have with your work. Other techs would not have given the "high charging amps issue" a second thought. Great Job.!!!
10:37 Sorin, if I suspect that something is missing, I write laptop model in google search with word Motherboard at the end and then switch to google graphics.
Very often you can see motherboard pictures and you can compare with your one.
If there is no pictures on google, then use youtube - write laptop model with word disassembly, and pause video when someone taking out the board.
I find it fascinating you wake up at 2am with diagnosing laptop problem/fixes :)
Learning something, even at night. Sorin, you're the best!
You so remind me myself... When something thechnical is bothering me I can wake up in the middle of the night with new idea...
Glad to see I'm not the only one who works into the early morning hours😵 Yes RC batteries can take a hefty charge, also use smart chargers to regulate. I've been flying large scale acrobatic RC for almost 20 years now. Sleep well !! 😉
Thank you Sorin - you have taught me so much over the years. I can't thank you enough for all you do.
Too much coffee perhaps, cannot sleep? LOL. Thank you for sharing and I have learned something I am not the only one.
Sorin dreams about electronics 😄
Thanks! This is becoming a proper "reality TV". ;-)
Disconnect the battery and see what the draw is. Then charge the battery to full, then connect it to the system and see what the system draw is. this should tell you some things. love the chan, thank you.
Have another coffee, my friend. You deserve it!👏
12:15 thank you for this. This is very logical, and I've seen few mainboards inside batteries, so I know what is there, but now when you said it, it sounds obvious for me that balancer inside battery decided how to charge it, but I never think like that. so thanks
0:54 thank you that you investigate it again. I was curious as well.
I LOVE THIS. ANY GUY WHO WAKES UP AND MAKES A VIDEO IS THE BEST
Excellent teacher !!!
😂 can’t wait to see more in middle of the night.
I totally understand that feeling !!!
True sign of someone how cares and is committed, nice!
English is one dyslectic language, i know, but it's "who" (who cares maybe, pun intended).
Very unusual battery but not impossible, excellent diagnosis, Sorin. Sleep well
awesome videos !!
Hahaha, fixing iphone 12 pro right now...
Yeah the BMS (battery management system) in the battery can be damaged, u need to full load the battery and load again with the Power supply, check the current is it again over the 2.6 amps and not going down than is something wrong with the BMS. The ocp (over current protection) is not switching off and will load the battery to the input voltage.
No, another coffee! 😅😏
Hi Sorin , it could be the fast changing. I have seen that asus claims that some of theirs laptops it will charge the battery up to 60% in like 49 min
hey man just wanted to let you know im learning allot from you i also started posting some videos on board repairs thank you my friend
I got up early and was surprised to see you here, coffee will just keep you awake Sorin :)
I found many laptops booting in bios generally they use full of the system power so most probably don’t worry about it will work fine
Your battery analyser says it 3400mah battery, so it’s charging at less than 1C, battery is only eight percent charged so it dumps as much current as it can take in constant current mode until cells hit 4.2V and then go into constant voltage mode, fifty watts charging power for a modern device doesn’t seem unreasonable to me.
That mosfet was never on the board, yo can see the copper color of the pad where it should supposed to be.
I'd have tried the thermal camera on the battery. Probably not practical for Sorin but swapping to a different but also-working battery *might* yield different results ?
Why did that customer send his device precisely to you? When you receive another similar model for service or see a battery with the same part number, would any of your concerns or questions be clarified? Come on man... keep calm... all is well, it's just a matter of time before we get familiar with her.
Also intrigued and curious, I went to the manufacturer's page and they have a special 30th anniversary edition model. I went to look at pictures on the ali --res page and it looks like this mosfet is not installed (this is how this PCB was factory assembled). Thank you for sharing this very recent model with us. All the best.
Hi Sorin
Which cam you are use over desk and the pc software for recording? Thanks in advance and nice Sunday for you and family
It also happens to me regularly that I get up in the middle of the night when I'm still thinking about a problem...
4:43 I was thinking - the client have said that he replaced battery - so is it possible that he took battery from a different, but similar model?
let's say that there is similar model but with the powerful charger 4.74amps (comparing to 3.42a here) and he took that battery from that powerful model?
Lenovo Legion 5i from 2022 is Charging the Battery with 220w ;) 0-80% in 30min (quick charge mode)
Wow your the best! ☕😎
What is the battery charger and that software used? That is pretty cool info to read from the battery.
man I have a Dell Precision 3520, I noticed it'd randomly stop charging, at like 80 percent so i left it alone but forgot to turn it off and I guess the battery got drained, then it just wont turn on lol. nor charge tried different ports and charges but noticed sometimes it'd click when plugged in, now it just either blinks white and doesn't respond to the power button, or it'll turn on fans come on then shut off, sometimes with an amber light sometimes without a light, just happened outta the blue when i left my home lol
Good night 🌃
Looking at ASUS chargers on eBay they range between 45-65w. This falls between those.
With 19 volts x 2.65 amps is 50 watts.
Can you check the charger? It kinda sound logical if its a high performance laptop.
Hello
In my Asus FX505DT I have the same current of charging battery.
3am...lol
That's what happens when your BRAIN is stuck in something....
Does the charging current drop when laptop is almost fully charged ?
They are hammering that battery hard. It'll probably die early.
Can somebody explain to me Sorin's first measurement of 2.65 amps with the multimeter? I thought to measure amps the measurment had to be in series of the power line and not parallel? Also I could not see a power adapter plugged in? Have I missed something? Great videos though Sorin, thank you.
Yes, he first shows 2.65 A on his power supply (big red screen on top), not on multimeter ( smaller b/w screen below), this is the current consumed. It is being supplied by the two multimeter-like probes. Sorin frequently mistakes them for the pair that is connected to his multimeter.
Also watch his ch341 programming video, where he does what you thought he did here: measures the supply current with a multimeter by connecting exactly like here.
@@suediem9315 Thank you so much for clearing that up, I had totally missed that. Makes perfect sense mow. Thank you.
replace the shorted cap. could save u time.
YOUR SOOOO COOOL. MIDDLE OF THE NIGHT YOU SLEPT ON IT. AND YOUR MAKINH A VIDEO. CUSTOMER SHOULD HAVE GIVEN YOU THE CHARGED BATTERY.
I slept on a laptop once and it damaged the screen a little.
I think this is Rapid technologi charge 🤔
It's okay, it's made to charge quickly and to the maximum possible capacity which is at 4.35V, nobody cares about longevity anymore.
But it's still strange how battery controllers won't properly lower the charging current according to the remaining full charge capacity.
Might could be also a false/replacement (not original) battery
You work to much but you are smart !!
Hi Sorin, I have 19 volts on the power button. What is possibly wrong? Thank you
HI, I am not Sorin, and i dont really know what i am talking about, so take my comment with some salt.
I think that if you are looking at laptop power schematic that Sorin draws (as unprofessional and shine less as it looks, to me, it become the best schematic i have ever seen on the topic), then you would agree that it shows 19v coming along the main power rail and entering the 3.3v always on power supply. This 3.3 AOPS then creates 3.3v average voltage by having its upper mosfet to connect 3.3 output rail to 19v rail roughly 20% of the time, and having its lower mosfet to connect that 3.3 rail to ground the rest of the time. This happens with high frequency and after averaging we get 20% of the incoming 19v passing to the output and that is roughly 3.3v.
So, for the 19v to be on the start button instead of 3.3v, I think the 3.3 output rail needs to be connected to the 19v rail 100% of the time. Since the 19v part is controlled by the upper mosfet (this is why we call it 'upper', it is always above the lower mosfet on schematic, not IRL on PCB), i think it is this 'upper' mosfet in the 3.3vAOPS that is being always open in you laptop.
Now this could be because it has failed short and forever connected its input and output. Sorin says this happens, but rarely. Usually it is the lower mosfet that fails short, and then we have 0v on the output power rail. Both mosfets are controlled by the controller chip, which is sending control signals to the gates of the mosfets, creating the 20%-80% timing. Maybe the controller chip is not operating because it failed, or because something else is preventing it from working.
I hope you have watched one of the latest videos about testing mosfets and read the comments, because you will need that to test your upper mosfet in 3.3v AOPS.
@@suediem9315 Thank you very much for your answer! Much appreciated
Koffie, and a little drop of vodka why not.
What happened to Sorin Electronics? Nothing posted for 2 months??
I actually think the industry (phones, laptops) now want batteries to charge fast so that they(meaning the device) die earlier. My new phone charges at 80w to 90% in about 20 minutes, there's no way it'll last over 2 years .
probably true, manufacturers slavishly catering to users' perceived need for instant everything to the detriment of product life
@@daffyduk77 you meant to say that they are slavishly catering to their own pocket.Notice that the battery is made to not be disassembled. Manufacturer would claim safety, care, love and angels, but it is actually the cost and making sure Sorin does not replace the cells, but buys a new battery.
@@suediem9315 that's a given,underpinning how they're pandering to a view of customer gratification based on "works until the warranty ends and no more"
im here
hello master
Fast charged
Sorin can you share contacts of seller of microscope like yours I have my friend in Germany want to grad one for me am from Africa
What worries a man worries a man.
Someone is up early
Sorin the voltage for this device is 19.8 (written on back) your power supply is set to 19V. Also the battery has written the capacity charge voltage and maximum charge current written on it. So just check the battery. Also the contact with the probes is not good enough (my opinion) Just check the battery marking (unscrew probably on the bottom)
Get back to sleep and charge your battery.
You sleep at work?
no, he works at home for fun sometimes