We have a warranty job -Acer Nitro 5 gaming laptop Power throttling - Karma of replacing a capacitor 

The fact that he doesn't edit out the mistakes is what makes the videos more enjoyable. It also makes it easier to memorize the correct order to follow when checking things.

I just wanted to drop in and say thank you for sharing your wisdom. I got into soldering/desoldering/troubleshooting PCBs a couple months ago and have since got a nice little setup. Your videos are proving to be the most beneficial to me as I begin learning how electricity moves through a board, how to follow it across the board and spot failures etc. Thank you again for your amazing work! Keep being an amazing human! :)

Over thinking it can make us forget the basics. Finding the root cause is to start from the basics and then up the antics until you find the fault. Thank you for sharing.

A warranty job always adds extra weight (some more pressure on our shoulders). If I were the owner of that device, I would know from now on who my trusted electronic technician will be and I can imagine the type of recommendation he will make to his family, co-workers and close friends. Another way of saying it, some technicians enforce the warranty much better than some representatives of the manufacturing companies themselves. Thank you very much for sharing. A brotherly greeting from Mexico.

Legends think everything BIG....

Sometimes, we get ahead of our own rule book and actually make schoolboy errors. We ALL do this! I don't care what people may say, we are all guilty of this. "It won't be that so...." then an hour later we find it WAS that! Sorin, the fact you publish this, with the error of assuming the mosfet was good when it was actually the issue is commendable. Bottom line is you still fixed it. Can't believe! :)

Any person can make mistakes; even ones he wouldnt normally, but a smart person picks up his errors and thats the diff!! Sorin almost always gets it solved unlike other Repair channels...

You should stay away from philosophy a lot

I had similar problem with my laptop. It started to shut down randomly by itself. It even started to not coming on after some time. After disassembly the voltage on a main power rail was 6.0v, but without short circuit. The voltage was dropped on the first MOSFET, multimeter showed the gate shorted with the source. MOSFET replacement solved the issue.

how you got 25v from 19v charger?

Nice job Sorin its even an amazing example of how mosfets are dying when people start undervolting CPUs etc and they are watching only the low temps of the chip, not knowing if the voltage to the gate of a N-FET is correct to be able to bridge S to D correclty

18:30 5A @ 19V is almost 100W. A regular soldering pen is 20W.

at first You need to rewrite bios.. :)

It was difficult, but actually it was very easy. Great job Sorin!☺

Sorin the Wizard…customer was wright 😂

You are too skillful and having too much experience,also you seem like feel so boring on an easy task, that way you will be more easily driven into the rabbit hole....

Tha first mosfet p2 no3 30v 100A FDMS MOSFET 30v 22A AGAIN IT'S SHORT QUICKLY

Great job anyway!. You are honest to show your mistakes even. What I do usually check adapter voltage and compare it with the current sense resistor. Mostly if I get 0.7v or 0.8v lesser voltage than adapter voltage at current sense resistor like 18.8v in your case. I will definitely check the 1st 2 mosfets and if you are not getting drive of 24v at gate. Then there is 70% chance that the MOSFET is shorted. Mostly the 1st mosfet gets shorted. Also, there is 30% chance that charger IC may be faulty. But in some cases, charger IC will be good, both main power mosfets also will be good, but gate drive will be absent. In this case, I used to check the 10ohms resistor in series to charger IC, if those 10ohms rise to 1Kohms then current flow to charger IC becomes insufficient and charger IC will not produce 24v with its internal charge pump for the gate drives. These what I consider. Hope this might be helpful.

Do you have a link to the mini electric screwdriver you use? I checked your tools page, maybe I missed it?

Wow, a shorted mosfet on the in rush limiter...how the laptop was working could throw anyone off but I guess always ruling out the basics when it comes to board repair is certainly a must. I will take note of the valuable information shared in this most informative video...thanks again Mr. Sorin

does this mean that if laptop charger is supposed to be lets say 19.0V and you plug a charger that`s only outputting 18.0V then mosfet will get hotter with more with 18v charger compared to 19v charger and possibly blow up the mosfet?

did you use the same temperature on the hot air station to remove first and second mosfet ? today i was working on tp link modem there were 3 shorted ICs (TPS562208) it's a small IC how to know which temp i should use to remove it and replace it ? i tried 380C and 15% airflow speed because there was too small components near it

I have an Acer Nitro 5 AN515-45-R3HB, bought in july 2022, Ryzen 5 5600H + RTX 3060. It consumes battery while plugged in and in-stress ( while gaming ). I've noticed though it also gets consumed while browsing the desktop, just much slower ( 1% in 1-2hours, gets recharged ). I have replaced the charger with one from Acer of higher power ( 230W, same Voltage, same polarity, different Amp ) and it is not dragging more power, so it is not the charger at fault or a lack of power under stress. I think it is some kind of shortage somewhere and I think of sending the laptop in warranty, but I replaced the RAMs and the HDD with an SSD. Originally, the laptop couldn't be stressed because the RAM was so bad the laptop barely had 40fps in CSGO. So I think that if I send it in warranty they will send it back to me telling that it has no problems ( I need the laptop because it is my only computer at hand, and I use it for university and work, so if it is not worth sending it to warranty I'd avoid it). I'm curious what could be the issue. I'm a CS&E student studying computers and electronics. I'm not saying that I want to repair it myself because it is worth a lot of money, I'm just curious what problem it has. (Romania)

How can I repair my voltage fluctuations in motherboard....due to which iam getting bsod(blue screen of death)

Thank you very much for lessons, now I'm going to check 25v power rail output on the 1st as I suspect to have the same issue, I received Lenovo s145 ideapad having a burned 2nd mosfet in dc jack and replace it and laptop turns ON and didn't last, not charging light flashes and shutdown and I thought is a charging or battery chip, so from now I am going to check 25v gate on a 1st mosfet

ASUS doesn't take this seriously. It allows 3 charges in Windows, 4th discharge in Bios enables new features for the laptop. But Asus tricks the customers with continuously reducing the battery power to 50 min max, that means, only 40 minutes can be actuay used for Amd Turion. Acer is much better, it enables all features possible depending on the battery's manufacturer, szch as Sanyo. Asus sends a drone to take out Asus mice for extreme high price, financed by multiple countries. To take out an Asus Mouse, the air strike can cost 20 thousand dollars.

ASUS doesn't take this seriously. It allows 3 charges in Windows, 4th discharge in Bios enables new features for the laptop. But Asus tricks the customers with continuously reducing the battery power to 50 min max, that means, only 40 minutes can be actuay used for Amd Turion. Acer is much better, it enables all features possible depending on the battery's manufacturer, szch as Sanyo. Asus sends a drone to take out Asus mice for extreme high price, financed by multiple countries. To take out an Asus Mouse, the air strike can cost 20 thousand dollars.

Two more faults, in addition to the cap you changed previously??? What kind of crap is Acer putting out? I've gotta put them on the "not recommended" list, along with HP and Lenovo.

You didn't say which pins of the mosfet where shorted, was it Source to Drain? Gate to Source? Make a video where you ll draw the schematic explaining the symptoms.

In all acer nitro / aspire that i encountered similar problem it was always the faulty input mosfets , symptoms are no 25v on gates (usually its 19v) and as result BQ senses voltage drop, enters safe mode and stops charging batteries and disables turbo bust on cpu. Usually that problem occurs after short circuit on motherboard and often input transistors are looking good , after you check them with multimeter they react like they are perfectly working , but after you swap them to new one's you get 25v on gates and completely working laptop

I do have this kind of the same issue before. With my asus x507uf. When the cpu temperature reach about 75°c on bios it shuts down. What I did is I put flux on cpu and heat it up with a heat gun and its not shutting down anymore.

No way my ideea was right im wondering why you are not changing both cips and if not working move to the next step the mistake is you changed just one my ideea was to change both mofets

Nice diagnostic. So is this still a warranty fix?

Amezing video

Good job Sorin i work in this industry for last 20 years and its my first time when i see theat fault

If you told all the details, I could maybe learn it just by paying attention

Every time when there is short on somewhere on motherboard always there is second problem always first mosfet get shorted because in moment when occurs short there is too much power on first mosfet which is not designed for that power

Why we could get 25V on the gate with only 20V on the source? It shouldn’t be 20V on the gate too?

This was great Sorin

Thank you for your priceless video Love from india

The method you use fault-finding is great to watch

excellent job Sorin

Are you sure it’s not the bios? 😂

Sorin what is the easy way to identify n-channel or p-channel mosfets ?

I do not agree with the fact that your warranty covers any other possible fault after repairing the motherboard. What if the GPU dies ? You will buy a new board for the customer ? Youre to good man

Hola Sorin, excelente trabajo, gracias

Sorin is; the best there was the best there is and the best there ever will be

i think charger is low power one ? :) idk i i tell this on first test :)

Sorin is a Wizard 😀 Nice username 😀

So many Acer went to fix it's not a good commercial

You could solve it easy with bios update :)

That wizard is such an awkward customer

Wicked fault, great find my man

Make sure you pull the bios first and reprogram it 🤣🤣

But we should not just randomly check MOSFETs for shorts. Like you did here, we should be spend time gathering information with what we can observe with minimal intervention. In this case, you decided your next step is to rule out the common element between what presents as a battery related fault and power rail charging fault. This time you picked the mid-point in your 'divide and decide'. The thing that might bring you to the start of the chain was the heat and volt drop on the MOSFETs. Not a terrible mistake, it just happened that you picked the wrong part to interrogate next.

Please I need a video on faulty BQ chip

Great way of showing various thought processes on power fault tracing on a laptop. Invaluable lesson to us all...Still trying to work out what that lesson was though....

Sorin I recently had a similar board repair, it was acer nitro 5 AN515-43, THE 7J7D chip was getting extremely hot upon removing and testing thhe board was not taking any power ( no charging light at all - but searching for that Chip online was impossible to find ). Further tests also shows short circuit around the GPu caps.

Yeah, OBS should have a bigger indicator when it's stopped or recording so you CAN'T miss it, ie, someone should propose it on the Git. That's what was blowing up those cheap spot welders, ie, not enough voltage on the MOSFETs enable pin.

i got a similar issue in Lenovo Laptop, i replaced all Mosfets on main track but didn't work, i still need to replace the BQ chip hopefully it will work thank you for the information, I learn a lot from you

bring back mystery component

Taking a step back the original fault of a capacitor short on the MB would have possibly put a stress on the input MOSFETS. I really wonder if due to the stress, it would have been worth changing both the MOSFETS. In hindsight if the supply B+ voltage is low then the current will increase (same power required to run laptop). That current has to pass through something. In your case the two MOSFETS. I think the interest in your head at the moment is software, not hardware and that may be impacting on the diagnosis. It happens to us all.

16:34 still burning using termal camera 🤣

Thanks Sorin for this video. Now I think I know what is wrong with those MOSFETS that we jumped with "a proper calibrated fuse" The problem was with the mosfet before that one Thanks Simon

LOL the shorted mosfet had FML on it.

Don't know if anyone can help me but i bought a faulty nitro 5 laptop iv put a used working motherboard in as the sr40b chip had blown on the previous board its now turning on but I have a black screen and no hdmi signal but I don't know if the screen is faulty as well hence the black screen and it didn't come with a hard drive does it need the the hard drive with windows and drivers installed for the hdmi port to work hence why there's no signal with the monitor or should it still boot into bios thank you inadvance

Well done Sorin.U professionally did it.

when you saw the mosfets get insane hot at 15min of the video I was sure you were gonna change them right there. I overthink as well, sometimes something very simple is the problem and I try literally everything else because I think "It can't be simple". But it is always simple things that cause big problems.

Everyone sometimes slip🎉🎉😅😅😅

Electronics are funny but not easy

Thanks for the awesome lesson! I always make the same mistakes of over analyzing the problem without doing the simple task first.

The bad battery has worn out both mosfets, I would replace battery , make sure new battery is fully charged then retest to confirm.

Sometimes we all dive in at the deep end and miss what we consider to be something more simple - at this moment in time working out if it's the BQ charging chip or a MOSFET is equally hard but I'm getting there! The more videos I watch and digest the more I'm learning :)

Sorin you forgot to say "it could be a bios issue" and didn't reprogram the bios!, kidding aside great diagnostics and fix as usual

Sorin, What temperature is your air gun set at when you desolder these chips? And C or F?

"We replaced the capacitor!" 🙂

👏👏👏 One more good lesson! I didnt even know the gates of those mosfet were 25V!! Thank’s for sharing 🙂 Tell me if you go to Belgium!

is this what happens when we get older 🤣🤣glad you figured it out as always your the man!!! great job Sorin

dont buy gaming notebooks

When check the mosfet use diode mode. 0.450 of lower the diode inside damaged. Am I correct?😊

excellent video.this is the reason why we must measure a mosfet for good operation only with an analog multimeter.the digital one can fool us many times.

i think the mosfet name sums it all up lol FML f* my life rofl , glad you got it sorted anyway ;)

just missing a final stress test^^

Very important video sorin

How do you know that is not software issue, maybe it is a hard drive problem ?

Warranty job. Hahahahaha

33:35 finally what a relief lol but this is a very interesting case and it reminds me of one of your videos titled the importance of the first mosfet nice job

Lucky you didn't go with the bios issue and flashing :D

hi i want to join your school

Great lesson, a small observation when u removed the larger mosfet i noticed the little one moving but not move back, could be a chance it is bridging? never mind it didnt move that much 😃

but isn't the new procedure to first of all flash a new bios? 🤔

Is there a seperate power supply only generating the votage for the gates?

Well done Sorin. Nice job!!!sometimes we overlook the most simple fault ..

Basics Basics Basic👁👁

Sorin, aproape tot timpul când am avut capacitor in scurt aveam și primul mosfet in scurt. Când e cel de al doilea in scurt nu pornește deloc laptopul. 😊

All mosfets are difrent resistant but nice video again

If it is not BIOS/Chipset issue then it is the first mosfet ! :D

Nice!

Amazing.Thank you for the video

Hi Sorin, can you please explain how shortcircuited Mosfet which acts as a wire can cause 5. A amper draw to battery?