Brilliant tutorial. No fluff, just straight to the point. Thanks very much

oNE OF THE BEST TUTORIAL I`VE SEEN SO FAR...TKS....

After so many years of wasted time in the internet surfing stupidly and I found you, thank you, all this really educated me a lot.

Great video thank you for posting i was looking for this kind for a long time, please post more on laptop circuitry and component testing. Thank you, subscribed.

Love your probs thanks for posting cheers bud

To inform: Pin 16 of the chip U16 is not an output but monitors the actual Accu voltage to inform the chip what to do (regulating parameters in the chip), pin 24 BST boost is the voltage doubler stage output pin and is important here (check this). regards, Luc

Thank you for this wonderful tutorial.

Great and clear video, thank you !

Pretty cool. I am about to take my first electronics class and im just getting as much in as i can so that it wont be too difficult. Thanks for these videos.

Thanks, Glad it made sense.

Hi Rudy Glad you enjoyed it, i will see what i can do, time allowing .

Great video extremely informative

nice job

great video men i hope you keep up with the training

Thanks for the words of support,sometimes it is an educated guess,You know wat component you are looking for and you can see the other components that it connects to from the schematic and in most cases there is a id mark close as pos to components on the pcb so with a bit of deduction you can normally figure it out. Hope this helps,Thanks for watching.

Nothing like mastering a new skill 👌

This is great, very nice of you to share. Where is the best site to get schematics at minimal cost?

Great video. Thanks for taking to time to share this.

Nice video there Daz keep the videos coming.

Great tutorial, a long time searching for this. Good explanation

nice

thanks a lot for the tips!!

Excellent video, thank you very much. I have a question: you put the yellow tags to the voltages, or are included in the scheme?.

Thanks for helping me

a challenge in itself IS getting a hold of the schematics; it's nightmare lol

Thanks for ur video but couldn't see where u put ur negative wire before testing. Thanks

Well done bro

how did you find an electrical diagram of the motherboard. been trying to find one for mine. but i cannot find one anywhere. probook 5330m i3

Cheers buddy.

thanks a lot for this video hope to learn more from you.

U are a good teacher

Iv you go too Part two of this video there are some schematics listed in the description. Hope this helps.

Thanks.

Thanks for sharing, well I need to know if it's possible to have my Acer Aspire repaired as i have been told that the Bridge is faulty. Whether I need to change the complete MB

Thanks, I added the yellow tags to denote the voltages. Thanks for watching.

Excellent, glad you found one, if the guy has a website pm me the link and i will drop the link in the description.

Hola. Thanks for the reply, nice to see the tech help world still has some rolling stones :) Tried each of the links with no success, seems like I've stumbled upon a more secretive line of Acer!

Excellent explanation very useful. Only one small part is not clear vpack 5v becomes 10v. Which circuit part raise from 5 to 10v. If possible please answer.

Hi Mark, if you look in the description on part 2 of this video there is a list of places you can get most schematics for free. Hope this helps.

what is the 6.12 small inductor doing , current sensing ? sorry if you answer later , thanks for videos just watching old ones and real good so far .

Great job

Thank you for sharing sir new supporters here

Thanks very much

very nice good teching

Really useful

Good day sir.... your video is great and i learn a lot. thanks you so much....i hope sir you can make video on how to step by step test the dead laptop....like this video...more power!!!!!!

Thanks

nice thank you

A good one there kudos

Hi computertechled, Glad you liked it.if you check out the video description there is a link to part 2. Thanks for watching.

How are or where are you placing the negative (black) lead from the multimeter? I see you use the red lead to connect to the test point to get the voltage reading but I don't see or understand where should the black lead to get the ground without damaging the board circuitry. Thanks a bunch. And keep up the good work.

Hi I have a question about the chip at 1.26 I need to replace a D95280 1206, can I just purchase a chip and solder it in using a reflow gun, or does the chip need to be programmed to suit the motherboard. Thanks

Hi PLAlfa, Its not written this is what i got out of the charging chip, then it was doubled up to 10 volts before it gets to the battery. if you are testing a charging circuit the characteristics may be different depending on the motherboard make and model, you would have to look up the chip and see what the output voltages are.

Hi Chris, You need to search for the motherboard part number to find the one you need not the laptop model number. Hope this helps.

If you go too Part two of this video there are some schematics listed in the description. Hope this helps.

Excellent guide, especially for a beginner like myself :) I think I know what component(s) have failed (input charge registered but no output). HOWEVER I can't find the schematics for my laptop to confirm my suspicions or to identify the chip part numbers (neither are labeled ). Do you know of a good resource I can use which offered schematics? The laptop I'm currently looking at is an ACER 8472TG. It's not receiving power from the working adapter and it's not charging its battery....

Great video easy to follow, can you do some apple laptops please thanks

Hi uploader ,and thanks 4 the great work. im looking for the circuit diagram from MSI GX720 1722 model ,any idea where can i find it. cheers.

GREAT

Very interesting

Any ideas of how to get rid of those black protective foils that often cover major parts of some motherboards? And most importantly, how to stick them back after fixing the mobo? :q They don't seem to stick back anymore after peeling them off :P

Hi your videos are great .Is it posible you could do Charging curcuit on a Samsung NP R40 Plus as it seems a lot more complex battery won't charge and have no ac led lit Lap top is not seeing ac in.much apreciated .Rudy .

What if you check power tree directly from dc-in to battery out, isn't shorter way ?

thx

I've been in contact with an American eBay who sells them for just 4$ who has turned out to be a bit of a legend very much like yourself. He's already e-mailed me a PDF of the schematic and is even walking me through the problem along with some tech expert friends of his. Both of you are a credit to eBay, you tube and the Tech help world in general. I wish you every success with your every adventure, people like yourselves richly deserve it :)

Hello thank you for posting. I do have a laptop Toshiba with double sided parts, very complicated as ref in your film. All the smd fuses are ok. No charging! no short circuits, power adaptor perfect 19V is available inside too on the power fets.(DCdC converters). Where can I become the drawery papers? Toshiba C870 18D modern laptop. Thank you for reply me. Grtz Luc

Man brother you are AWESOME!! I have a mac mini 2009 with no power. Is there any way I could get the schematic for a mac mini?

hello and thanks two things here really , how did you come to this conclusion regarding the voltage over R285 to be 19v ??? there are two adjacent resistors which will divide the voltage ,!! second: in order to do that you need to inform the people how they can get the schematics otherwise they cant apply tests for other pcbs ... other than that thumb UP well done .. keep it up and Thank you!

great vedios

I think I found the problem of your board, there is a mosfet below D20 it has some small holes on it.

Loptop turn on and work well after 10 to 15 seconds quick pover off please tell me problem?

pretty cool !!!

شكرا لك

Hi john a, if i get one in that is worth fixing i will do a vid on it,Thanks for Watching.

Sir, what voltage should battery +ve connector give to charge battery ? When battery is not connected ??

I have had a google with no joy and checked some of the schematic repositories, You are out of luck with that one, the only other thing is to email an online schematic supplier and request the one you need but it will not be free.good luck hope you manage to get it sorted.

Cool

Thank you ..

Hi Sardoggy,You can use Ground point or connect to the negative on the power jack.you need to look at the schematic and see if for the board you are testing has a common ground, or if you need to pick up -v at different points but in most cases on charging circuit it is common negative from input to output. hope this helps you can view part 2 @ kzfaq.info/get/bejne/gbx4qJhiq8uVlWg.html . thanks for Watching.

I dit a lot of research but I can't find circuit-diagrams for my motherboard. Do you got any pice of advice where I can usually find them? On the manufacturers-homepage I can't find any. Thanks for help!

Hi Chris, If you look in the description to this video there is a link to Part 2 of this video (Testing the charging circuit on a laptop motherboard Part 2) there is a list of links to schematics & service manuals in part 2's description. Hope this helps. Thanks for watching.

Hi, Have a ASUS A3A Laptop motherboard board and the problem is it wont always power up BUT the power switch always lights so i figuring a start up capacitor as it works perfectly when going , just the start up. Also if you reset the computer it will stall when it restarts so i figure the big gulp of power then as well indicate a cap for initial start. ts not the PS as i done all that as i repair electronics just never a laptop board as its all so tiny and almost unrepearable. and tried all usual drain tricks with power button and as laptop runs when going , it not the PS .. So am i looking around the power input for these caps and will they be big or small surface mount types ? Thanks for any help

Nice how to video.

It would be much supportive if you can state the model number of the Motherboard on which the Demo is being given .Thanks

Your Welcome,Thanks for watching.

This is great. Thank You. There aren't a lot of people willing to share this info freely, so I commend you on your generosity. I have a quick question, I find it very hard to find components that are tiny especially when the designation is not near the component as I can see is your case too. How do you find components by what is written on the mainbord when they are all bunched together? Thank you again.

Did you make the schematic for the AC circuit or find it on the web? I can't find any schematics for a laptop I'm trying to fix the charging circuit on: Asus K60ij

10:10 - I can't understand why the voltage is now 5V (why doesn't it show on the schematic )? Great video btw.

Hi grimreaper9666, we don't get the pleasure of working on many apple mc products if i get any come in i will do some repair vids.Thanks for watching.

Hello I have an acer aspire one 725 0412, when I plug the adaptor the laptop work normally, but the battery doesn't recharge, a message "battery 0%available, plugged in but not charging" appear. I went to Device manager, battery , uninstalled drivers and reinstall but was the same. I bought a genuine brand new battery and nothing change. I measured the adapter and was fine, and the laptop work normal with it. Can you tell me if I measure the battery connector on my laptop, which ammount of volts is the normal number to read?, because I measured and the maximun was 3.36 per each contact. Do you know what can I check ?Appreciate your help. Show less Reply

Next to my jack sparks when I plug in. Can I fix it?

Forgot to mention, if you check out the video description there is a link to part 2

hi.. i hve a ASUS laptop motherboard. on powering it doeant gets on. on pressing d south bridge ic. it starts. i thought it must b some loose connection somewhere. so i cleaned total mbd wid ip solution and heated my motherboard. but still no success. pls help me.

Hello fixitdaz,Have an Aspire, when I connect a charger (19 V) with the laptop off the battery loads fine, but when I turn it on charging lights flash and asks me to conect the charger. Only with the battery works fine, and I tried it with other chargers and does the same, I tried it with a 20 votls that if it worked well, which parts should I check? Thank you very much for the videos, they are very good.

That don't make sense at all, why would the laptop drop the voltage to 5 volts and then boost it back up to 10 volts? that would be very inefficient

I have Lenovo 3000 n200, witch stops charging battery after few minutes. battery is brand new, and one thing I've noticed, when it stops charging, if you remove a battery (pc is on AC adapter) it turns off. I think its the charging chip's fault. thanks for the video. I will try to check it.

Hello where can I buy the scanner?

hallo ...After I removed sio because he was unemployed, I found that the same base of in the motherboard was buried. there is 3 pin disappeared ..i don't know what i have to do ..thanks

Hi you may find more information in part 2 see description for link. If you can read a circuit diagram it is not a too complicated circuit. Thanks for watching.