How to fix dead laptop motherboards, acer aspire 5742

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[@boogerhead0]

Today I fixed my dead Acer V3-571G, using your tutorials. I went whole hog and found the schematic and studied it. There was a B+ short to ground, hateful problem, found using ohmmeter. I hooked my bench power supply up, used the +5 max 5a and touched the 2nd MOSFET output (pins 5-8). I couldn't find the hot spot, so I sprayed the board with compressed air, upside down. This showed the hot spot. It was one of a set of 4 4.7Uf 25v caps, PC56 to be exact. I just removed it, and the board fired up find. While putting it all back together, I gave it a new bottom plastic case, since the hinge holes were pretty well broken, and a new keyboard surround. It looks great. It has the GT730M graphics, plus 16MB ran on 2 sticks, and the i7-3630QM processor. I put a Samsung Evo 850 1TB in, it is really fast now. A great performer, used it for graphics design and programming C++ Thanks for putting up all the really great videos. You helped me tremendously. A+++ much appreciated.

[@alex-ip1er]

hey ,if anyone else trying to find out electronics repair services try Saankramer Electronic Magazine System (do a google search ) ? Ive heard some awesome things about it and my cousin got excellent results with it.

[@oussamah.9830]

Hey buddy I have almost the same problem and I need some help..

[@Matthew-om3rz]

rly? 1 small thing on board can be removed to fix it!?

[@thingshappen9199]

Great job man. I'm trying to do the same. Anyone know at 10:30 why he put the positive lead on the second pin from the right on the mosfet? Could he have placed it in any pin on either side of the mosfet?

[@nardevpsy]

What kompresed air did use?I bayed one domestic but it didnt frozen the motheboard..

[@janganbaca3171]

my favorite teacher in youtube

[@niteflyer3380]

I truly admire your tutorial talents...I really don't want to admit just how many laptops (25+) that I have tossed for possibly such an easy fix... my eye's have been opened... wonderful...

[@amabraghanemimiegha221]

The best tutor ever on KZbin.

[@anjrittuladhar]

Sir, you inspired me a lot to learn electronics.. I've not missed even a single video to watch. You're the real master!

[@MiettedeThonTomate]

Monsieur, pour les réparations de composants CMS, vous êtes le Roi ! Et je préfère 1000 fois regarder votre chaine KZbin que des conneries à la télévision. Merci et bravo de France 👏. Sir, speaking about SMD repairs, you're the King! And i one thousand time prefer watching your KZbin channel rather than watching bullshit's programs at TV set. Thank you and bravo from French 👏.

[@spkay31]

Great practical troubleshooting video for laptop motherboards. Great combination of reasoning, deductive troubleshooting and understanding the basic component functions and overall schematic design approach. You can have electrical engineering education but to get this good at rapid troubleshooting and repair takes another set of skills both academic and a lot of applied learning in the lab with real problems to fix!

[@RosuValentin]

An electronics professional. I appreciate his work and the explanations offered. A very good job. Congratulations!

[@williambetts8045]

What a top quality video. This saved me from purchasing a new machine for my client. Its been 3 months and still no complaints from my ciient. Thank you and keep up the great work.

[@kenbarnett8189]

That was amazing! No schematic, no BS, just short the board and feel around for heat! Wow! I've got an acer that I bought in 2010 that stopped working 9 months after I bought it, I always guessed it was a voltage regulator, I think I will be working on my acer this weekend!

[@saraho.1222]

Great informative troubleshooting guide . Learned a lot more in this one video than all the other 'repair' videos out there .glad I came across this one

[@sonnybee8271]

I was impressed with your diagnosis on this job.I have a similar model 4752 no power ,but I don't think I could do all that to find problem.

[@freemanrolle7864]

wow you learned something new every day. you make learning easy and fun you are a cool guy thanks

[@stefanitha]

Frumos! Elegant și cu stil! Mulțumesc pentru instrucțiuni Sorin!

[@jackmalahlela638]

thanks teacher i just repaired an acer extensa 2510 you're the best

[@shield543]

Hoe gaan dit my friend, Sorin is good isn't he? I have an acer aspire 5742 laptop and I'm going to troubleshoot it now with this footage

[@carolh5465]

Wow! You are truly talented and I wish that I had the technical chops to do this as my Acer aspire v5 573 pg 7400 fried and the said it was the motherboard. Sadly my late hsuband and my life were on this laptop. They recovered some data. But not everything. I was enchanted by the entire video and I too have thrown laptops away. ! But the cost was prohibitive to replace the motherboard . If only there was someone like you where I live!

[@boogerhead0]

Just so happened that the mosfet you put in is a better mosfet than the one that was shorted. New = AON6414A, rated 30V, 30A, the one you took out MDU1511RH (schematic shows TPCA8030, rated 30V, 24A. One may wonder why the 24A mosfet shorted, but it did. Thanks for excellent presentation.

[@Igot2fly1]

DUDE. How do you find anything on your workbench.. LOL. The sign of a very BUSY guy. Keep the vids coming. I learn every time I watch. Thanks Sorin

[@robertmaybeth3434]

people like OP are geniuses in my view. I can't imagine how to make sense of all electronics. to me he seems a wizard.

[@achmadpriyanto761]

even if it not a live streaming. it feel like a live streaming, because with how you talk as if i'm or other watching you live. I like it. big thump up sir!

[@siyaciaraamandaperez]

Achmad Priyanto I just open my aspire v5 acer idk what to do can u do a video one of aspire v5 please bc my laptop was black screen 😬😩😐 1-16-18

[@dexternengomasha7579]

Hie.I am a boilermaker but I am in love with your tutorials.keep it up

[@gamehighlightclips883]

I love ur videos. Teach me more about how to fix motherboard.. If i can meat u teacher... I wanna learn more.... Thx u for your videos...

[@glennmc3684]

You should get a plastic box with compartments in it to keep track of all those screws that you simply put on the side so that you can keep track of where they all go.

[@shariarahmed]

Sir i watched your videos, very Educational, i learn a lot thanks for sharing this video

[@dejanmilosevic4854]

Thank you for unselfish sharing od your knowledge. Greetings from Serbia.

[@jasonledrew7677]

Very common for this model, broken hinge and then this. Thanks teacher!

[@jannemartensson9578]

Great job man you are amasing i got a 5742 by my self and its fine by me .Sometimes i have trouble wiht it so its great to see you leran how it work. I lived in Sweden sorry you don't 😀😀 if you do i send it to you . Take care / Janne

[@mafteif.bogdan8194]

I like your videos and your style , you have a chill mood in thinking to solve the problem. Continue to make videos like this because is very helpfull.

[@DaleMarriott1337]

great video, i have an easynote b3800e which i dropped some years ago, i took the battery apart and all cells but one was dead. so my thinking it was the charger that broke, i now think i am ready to tackle this problem

[@paublusamericanus292]

wow soren: I live out in the boonies in a small town in central washington. my download is 35, and upload is 9. Here you live near london, and have the internet speed I had in 1999. I remember when mine was the way yours is in 2005, and it was a huge improvement over what I had before dsl.

[@geofreykomu1100]

Love how you repair while teaching,good job

[@daz41262010]

brilliant to see the fault finding process :)

[@nitaalecsandru1]

acer aspire 5742;battery that 35% available plug in, charging. but my battery wont increased the battery percent.I need help! You*r my favorite teacher in youtube !

[@anficrino]

you are very very professional. I have a question for you: I have PackardBell Easynote TK85, with a motherboard NEW70 LA5891P (the same of acer 5741g)... Notebook suddendly shut off when GPU reaches 58° c (136,4 °F), without lag.... 7 days before, it shut off at 59 °C (138,2 °F), 10 days before it shut off at 60 °C (140 °F)... in your opinion, what's the matter? Cooler and heatsink are ok and clean. Thank you so much

[@m-i-pcraft570]

Thank you so much for this video. I will do just that on my acer apsire 5742. I have learnt something wonderful from you. God bless you.

[@ridariyad]

today i fixed my laptop ......you are a good teatcher for me thanks

[@daaudiome]

My friend very good explanation, let me ask you something, is it better that petrol (zippo lighter fluid) to see how the fluid moves on a shorted component, or Isopropil alcohol? It's the first time I can clearly see how the fluid moves versus how isopropyl alcohol behaves.

[@electronicsrepairschool]

petrol is better

[@karomokennedy5531]

you inspire me to become one of problem solvers matters laptops

[@kamranjavaid]

Sorin, isn't it better to use small constant current & voltage and then use multimeter millivolt scale to trace down short? Shorted component will have high voltage drop and this method will be safe for other components on board.

[@nitaalecsandru1]

battery that 35% available plug in, charging. but my battery wont increased the battery percent.I need help! You*r my favorite teacher in youtube !

[@Martin-ot7xj]

Hi there, please zoom in for more details on mainbord, and please show us where you put multimeter tip on mainbord to get measure! Thankyouuuuu, thnx to share your knowledge with us

[@Tech55502]

hello first of all i would like to thank you for your videos that you upload everyday for they are very helpful to me im so greatful that i came across your channel, i'm learning alot everyday. however i have one problem with similar laptop with similar problem but the model is not the same my model is acer travelmate 5744 so i'm having a challenge to find the mosfet you just replaced because the motherboard design are slighly different please help thank you

[@electronicsrepairschool]

hi, check my motherboards lessons, you will have a better overall picture

[@jaas9457]

great troubleshooting skills. very impressed. I would have taken out the jumper you made.. that would have confirmed that the actual problem was the mosfet and would have kept the protection of the switch in place. Any specific reason why you left it?

[@electronicsrepairschool]

Thank you. Thats the reason why there are two mosfets doing same thing, so even if you jump one, the second will do the job :) (joking, i'm getting old and lazy)

[@rummy1146]

Electronics repair school lol verry cute n practical ans

[@mathiaspfute9870]

@@electronicsrepairschool kkk

[@forbiddenfume3222]

Was very entertaining to watch, thanks! The Best moment: 22:28 "That chip is weird".

[@jerimiahmanzon1637]

simple and very practical tips thanks for the demonstration skills and tips...

[@fireendspycro2317]

Thnx soo much for this video ,it a very excellent work there. Please can you help me with Acer aspire e1-510? It can't power on and not even charging.no light coming on but charger is good and producing 19v perfect. Thnx

[@rahulchand560]

Sir will you please tell me how I can learn hardware repairing? After watching your contents I am very happy that u can do these things very easily. I am a physics student from India.

[@nmkzf]

grate skill and impressive problem identification and very focused approach to zoom-in on the problem. Q. Can one obtain schematic diagram for X1 lenovo 34xx MB? where?

[@ajamaan]

Mosfet you replaced can tolerate 61A=10V, but one you put in, can take 30a=10v. Would this be a problem in a long run?

[@attributive1339]

You are a great person sharing your skills with others, I'm watching your videos regulary and learned a lot of great stuff. I need an advice, I have a same motherboard in a Packard Bell laptop and what is happening, I have a charging light and it comes on I have leds and then it goes on restarting loop every 6 seconds so I assume I have a good 19v rail and 3.3v because it's turning on? Tried cmos reset same thing. Also when I leave it working in loop cpu does get hot so I assume CPU is getting power? Could it be ene controller? Thanks for help and keep up a good work. Greatings from Serbia

[@charleskamara1633]

Hope you gort help, Most probably a corrupt BIOS problem, seen the symptopms on a few HP Probook models.

[@namolokaman2393]

Regarding the disappointment over the phone running 4K at 30Hz vs 60Hz: "It's not what you want [ that matters ]; it's what you need!" ( referring to another Sorin video about Apple's philosophy ) :)

[@peter11914]

Love watching your videos i have learnt to fox and trouble shoot also by watching you thanks for the uploads

[@amilcaramilcar5330]

very good job u are doing, you explain and better you show the things, i am going to see your other videos for shore, thank you very much for your help. and keep doing this.

[@Muhammadnaeem-to7mn]

please answer if you change the ic which was heating up so after resolve issue you should not remove that bridge which you make on second mosfet. i khow its ok to do not remove it but for knowledge only. please answer as soon a posible.

[@Fourty_7]

I have a question mr Sorin , when tou bridge the mosfet you solder drain pin with the source ?

[@annyan904]

learnt a lot from this video.....this one was a bit tricky

[@RokasSondaras]

love that you help others with your content

[@hansklos3976]

Super Job ! Have a same problem with acer espire e1-522,the switches on the power site dont working a ic name PU4501 on the other site is very hot ??? Can you help me -what is this PU 4501??? Maimboard EG50-KB MB,12253-3M

[@recommendedforyou157]

sir on your next laptop repair videos can you please make sure we can see the label on what voltage in your power supply you are selecting because in this video I cant see what voltage did you select whether it is 19v or not. I only see it is short through the 2.4 amps but I cannot see what voltage in your power supply use to find the short. I am still beginner in this industry.

[@jurireville3158]

yeah my favorite also teacher in you tube :)

[@Martin-ot7xj]

Hi there, at 18:17 which pin did you make a short, pin 3 with pin 7 ???

[@nesport3751]

Wow!! Great video, Thanks for your video, it teaches me alot on how to find faulty components and how components work. Thanks once again and keep up the good work :-)

[@HarPreetSingh-gx9qo]

Please make videos on how to diagnose using oscillator

[@Drawmaster07]

Great! Best teacher on YT

[@htfdlouissirois]

Can't seem to find any information on a older system 76 laptop Panp5, A friend of mine has a system 76 panp5 laptop, it doesn't charge, or come on. when you plug it in there's a yellow light, when you tap the power button a green light flashes immediately goes out when unplugged there's nothing at all completely dead. also it seems the motherboard is in with rabbits took all the screws out and still motherboard won't come out. The parts of the motherboard that is stuck looks like there's a rivet in place of a screw, Do you have any clues on the issue why the power is not working and why the motherboard won't come out thank you.

[@khalidzorro5410]

Hi mister sorrin I m from Morocco and I love your videos I want to tell you that you lose 2 capacitors at 28mn58 Very good good job thank you ;-)

[@adisaolamilekan4519]

At 9:32 while testing the volt at the jack what if u don't have 19volt ..I mean at the charging port connected and the charging port is good ..what can cause it...? I have a lenovo b590 but the charginport is good but when Connected no 19volt again..

[@runo1297]

Thanks for the tutorial .

[@kamalbakour2950]

You are the best one

[@derekblake9385]

Tidy your desk! 😉great videos

[@krono32]

Why would you use lighter fluid and not some other liquid to help identify the hot spot? Wouldn't you worry about it catching on fire when power is running through it?

[@kompetankedi]

Thank you my friend my computer pq87 chip fixed and working thankyou again my from turkey

[@hasni0125]

Thanks sir, question, is zippo lighter petrol a flux? Or what, is it used in soldering?

[@nareshkapadia6388]

Great video and very Informative, thanks

[@Doitforthegals]

Nice work very informative. I'm reparing an Acer laptop on boot it has red battery charging light on and the blue light power on but black screen and fan not spinning. Tried Cmos reset but the lights stay solid on with no response on the screen. Tried ext monitor still no display. Suspect gfx Any advice appreciated.

[@davidhwang8407]

you have a good technology for repair board. you will be good manager.!!!

[@atha388]

sir you super. i am beginer laptop repir after show your vidio.

[@atscomputers]

thanks man proud of u, i have this challenge , sony vaio model sve151d11m bios locked. any idea how to clear bios other then removing cmons battery thanks.

[@StivenShady]

This is the most helpfull video on exactly this issue. Thanks a lot sir. best regards :)

[@mohamadaldarwish6678]

Perfect 👌 you are professional 🌹🌹🌹thanks 🚩👍

[@stevedebeukelaer1424]

Hi can you please help me with fixing my 3d laptop van toshiba it is an toshiba sattellite a665-14 c with la6062 p 4.o chassis. He got 19v power rail . Blue llight on the chargerlight , when you power up power buttons goes for 5sec on. Then shuts down i saw water damage on pu2. I clean it. 19v power rail is present. 3,3 normal too because there is light. I can you give a schedule from la6062 p 2.0 version. Please help me

[@mrdakvlado177]

my favorite best teacer electronik ..bravooo

[@latiffezer9675]

Hi sir,my laptop dead for a year.no power and nothing when pressed power button.i'm planning to do it myself by ur tutorial 😀. Model:acer aspire 5352 Amd c50.not sure where to start 1st.no schematic diagram!

[@electronicartis]

Like your work I have a dell latitude E6520 it works for 1 to 5 minutes random time it shuts down it keeps on repeating power cycle continuously could not use the computer can you help. just need some advice on what to look for on circuit board or on fix

[@mebratumulat7657]

I have a charging light and it comes on I have leds and then it goes on restarting loop every 6 seconds so I assume I have a good 19v rail and 3.3v because it's turning on? Tried cmos reset same thing. Also when I leave it working in loop cpu does get hot so I assume CPU is getting power? Could it be ene controller? Thanks for help and keep up a good work. Greatings from Serbia Read more

[@ramdegoma4640]

how about laptop battery not detected after replacing the mosfet and by the my laptop automatically turns on when plugged without pressing the power button. but it works fine just the battery not detected

[@MidasGoldKing]

Nice job buddy..you are rocking ..You just got one plus subscriber ...Cheers !

[@sidrasta869]

My Idol! Really The Best Electronics Repair Man that I Know. Trying to learn about all your repair techniques. I wish I could be your Son hehe. May I know what was the liquid u have used in checking the overheating components please? :)

[@tomwatson7626]

Petrol

[@sidrasta869]

Tom Watson thanks buddy. Are they thesame with butane gas? Can i use it?

[@doszuscik]

How do you get the power supply and meter reading on your screen and how you connect them. Thank you.

[@adu-gyamfijames2925]

Love this videos, am gonna stick to you till i die

[@MABAA_]

Greeting from malaysia!! Gonna love your educational video

[@mohammedyasin7775]

hi can you please let me know which microscope model you r using

[@AzharHussain-fh4wg]

Hey I need some help from you if you can my Acer travel mate 6492 laptop is not turning on and when I connect charger the charger light blinks and I take the board out and then reconnect the charger and I got on meter reading on DC the reading getting up and down and the power is not going to the bettry terminal please help me to find the problem.. I searched the problem every where even on your page to but found nothing..

[@jorisesperanza4029]

Sir, i have something to ask that chip you take in the other board that you said not shorted to ground, is it also called TG mosfet or (Top Gate) mosfet? that top gate mosfet Source pin are connected to another mosfet called (BG) mosfet Buttom mosfet in the Drain? and im from the Philippines a big fan of yours sensei. hehehe

[@TeChPaRaDiSe74]

Please Help I have a an aspire 5742 motherboard LA-5893P/ I5 processor. With your help i found a shortedb mosfet PQ90, I changed it. now the pc turn on and charge, blue light ok but black screen. But there is an other short that cames only when I plug the charger or battery between ground and PL39 and some other places not everywhere. can you please help me to identify the short I have only a multimeter and hot air gun. What must I do please? thank you very much

[@stephenbossomefi4111]

This video is very helpful, also you have expensive tools like your oscilloscope and microscope etc. But let me tell you something, you need more space, you need a big workbench :-)

[@88rtty1]

Good job my friend

[@agonzalez844]

I purchased Dell Inspiron 14-3452 that came with a 32GB eMMC "drive". It does have space for an HDD but no connections. Is there a way to solder the proper connector to the mobo so I can use an HHD?

[@suadcokljat1045]

No plus (+) , no schematics, no rush... Cheers! ;-)

[@4NDR3SV]

What Is the liquid you use for detecting shorts? Alcohol?