DC IN or Adapter voltage section working (ENGLISH) | Online Chip level laptop repair training course

Рет қаралды 46,652

6 жыл бұрын

How to read the laptop motherboard schematics diagram is explained in this video in English. This video will be very much helpful to read the schematics of laptop motherboard from basic to the advance. Laptex is One of the Best laptop repairing course institute for both online and offline in India. India's 1st Free #Onlinechiplevellaptoprepairingcourse schematics demo class of laptop repairing completed.
Our course covers chip-level #laptopschematicsreading with the internal logic of charging IC. Charging IC problem and solution concept with important pins used to monitor all charging faults. CRO and DSO use for finding motherboard fault.
How to read motherboard schematics and laptop motherboard diagram. How to use CRO or DSO for motherboard fault finding.
Motherboard internal logic, working, and problem-solving with practical #training. Problems like No display, Charging problem, Adapter not charging, Dim display problem.
PWM switching of MOSFET, Mosfet fault finding, switching of components used in laptop repairing all will be covered in our complete Chip level laptop repair course.
#Laptex is the first institute in India to start an online laptop repair demo class. Offline classes are going on all are invited to join and
see the demo video by clicking on the link below
www.youtube.com/watch?v=67K1W
How DC IN or Adapter voltage section works. DELL 3521 and 5537/3537 Power IN explained in schematics, CRO, Charging Section.
Mosfet switching, BJT switching, Laptop repair training, online/offline training, BIOS editing, RAM section, Vcore section.
HM and SIO section, Graphic-Non graphic conversion, onboard RAM disable, DSO, How to repair Adapter not detect problem, Plugin not charging, battery not detected.
Understand the tricks with logic to solve laptop motherboard problems step by step in Hindi.
Our complete laptop repair training course covers No display problem, 3v 5v section internal logic and fault finding, LVDS problem, dim display problem.
PWM switching not working and the duty cycle not showing on the DSO or CRO, Switching MOSFET fault finding, PCH section not working, ACOK problems.
DCIN section not working, 19V shorting problem, OPAMP comparator working, SIO, EC important signals requirement, working and output signals, and many other problems could be solved with a proper understanding of the internal logic and working philosophy of all components and ICs.
Laptex provides the complete component as well as chip level training with live practical on faulty motherboards to understand the application of the concept. As our slogan defines learn the logic concept.
For further query WhatsApp or call us
@ Mr. Nasir - +919871145066
@ Mr. Dildar - +919031240767
You can also visit our office @ 605A Sahyog building 6th floor Nehru place Delhi 110019.
Join our #course module and become an expert in laptop motherboard repairing. All are welcome to join our free Demo Class.
Happy Troubleshooting from Laptex.

Пікірлер: 126

@Tirkan 4 жыл бұрын

Very easy and clear explained. Im proud to be your stundent in your online class. Thanks Laptex!

@laptex1377 4 жыл бұрын

Thanks @nihad. Our student from Germany. Thanks for your appreciation. Really proud to have such a die heart learner at the age of 48.❤️

@reedbaylor2210 2 жыл бұрын

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@keeganheath2305 2 жыл бұрын

@Reed Baylor instablaster =)

@reedbaylor2210 2 жыл бұрын

@Keegan Heath I really appreciate your reply. I found the site through google and im trying it out now. Takes quite some time so I will reply here later when my account password hopefully is recovered.

@reedbaylor2210 2 жыл бұрын

@Keegan Heath it did the trick and I actually got access to my account again. I'm so happy:D Thanks so much, you saved my ass !

@Tirkan 4 жыл бұрын

And something for the record and for other possible students: High level of knowledge and practical skills are guaranteed! Every next class confirmed this and I’m very happy to lern from this school. Keep up Laptex! Regards from Germany

@laptex1377 4 жыл бұрын

Really appreciate your true feedback dear. We will try our best to provide the best knowledge possible.😊

@paweepko6178 5 жыл бұрын

You explained it like a mother to a child, i.e. like I would do it. Thanks a lot.

@laptex1377 5 жыл бұрын

Thanks dear for ur appreciation. This encourages our team to bring the best content we could

@demontagemontage 4 жыл бұрын

thank you great thankssss from ALGERIA جعله الله في ميزان حسناتك

@laptex1377 4 жыл бұрын

Thanks brother 👍. Keep supporting and Sharing our videos 🙏❤️💗

@laptex1377 4 жыл бұрын

Jazakallah

@NarasimhaB 5 жыл бұрын

fantastic explanation..subbed. Great details have been shared in such a short video.

@laptex1377 5 жыл бұрын

Thanks for ur appreciation sir

@radheshyambiswas2895 5 жыл бұрын

Thank you sir . Very helpful video for all laptop technician .

@laptex1377 5 жыл бұрын

Welcome dear... we are committed to help the laptop repairing family to grow with our best efforts.. Keep sharing the videos so that more people can learn from this.. Thanks in advance

@rameshrai1971 3 жыл бұрын

you are really genius. explanation way is far good. in this explanation way every one can be understood.

@laptex1377 3 жыл бұрын

Thanks brother 👍. We are trying to help as much as we can. Keep supporting and Sharing our videos ❤️

@mohammadanwer1 5 жыл бұрын

Weldon, a good insight for many technicians. it will help certainly to many.

@dildarkhan6078 4 жыл бұрын

Yeah definitely, it will help the laptop engineers in understanding the logic of laptop motherboard.

@laptex1377 4 жыл бұрын

Correct sir

@XYZ56771 4 жыл бұрын

Your english is quite good...such a relief! Please keep up the good work and the good english! And nonetheless, thank you!!!

@laptex1377 4 жыл бұрын

Thanks brother. Keep supporting and Sharing our videos ❤️. We will upload the contents in English as well.

@hemantakumarsahu4178 5 жыл бұрын

Simply great video

@joeycarr1398 4 жыл бұрын

Excellent explanation, thanks very much!

@laptex1377 4 жыл бұрын

Always Welcome dear. It's requested to please share the videos to all so that it could reach every needy technicians.

@mhasan5597 4 жыл бұрын

lakho salam..........lakho sukria............from Bangladesh..

@laptex1377 4 жыл бұрын

Jazakaallah. Bangladesh me iss video ko zyda se zyda share kro brother.

@mhasan5597 4 жыл бұрын

@@laptex1377 What is your course fee?

@laptex1377 4 жыл бұрын

WhatsApp +919031240767 For detail information

@rptamiltech2.039 2 жыл бұрын

very clear and nice explanation sir.Thank you so much

@laptex1377 2 жыл бұрын

Always welcome. Keep supporting and Sharing our videos 😊

@hakimamrouche3331 4 жыл бұрын

Juste perfect video Sir. Great thanks to you

@laptex1377 4 жыл бұрын

Always welcome brother. We are always ready to help 😊. Keep supporting and Sharing our videos ❤️❣️

@muralidharagk3801 3 жыл бұрын

Thanks for the video sir schematic are you doing good explanation about schematic of lap top

@laptex1377 3 жыл бұрын

Always welcome Brother. Keep supporting and Sharing our videos 😊

@SlashU4 5 жыл бұрын

Superb explanation!

@laptex1377 5 жыл бұрын

Thanks for the appreciation dear I really appreciate your view.

@techsolutionazl 5 жыл бұрын

Nice explanation, and your english is good, i want your video more in english please

@laptex1377 5 жыл бұрын

THANKS JOSEPH BRO.

@starkkevin3907 3 жыл бұрын

appreciate your work! keep it up in English Please!

@laptex1377 3 жыл бұрын

Always welcome... Yes we are trying our best to help our both hindi as well as English audience to get as much knowledge as possible from our little spoon of concept. Keep supporting and Sharing our videos ☺️

@alas3376 5 жыл бұрын

you explane very very good, thank you

@dildarkhan6078 4 жыл бұрын

Thanks dear

@laptex1377 4 жыл бұрын

Welcome Alaska be connected and keep supporting us.

@allaoui38 4 жыл бұрын

thank you for the explanation, it's really really very helpful, but what I do not understand how the mosfet pq100 can let the current of the drain at the source while it is a p channel, the drain normally is the + and the source is the - (voltage lower than the +).

@laptex1377 4 жыл бұрын

For in-depth analysis u have to consult us personally sir...

@SahilSahil-ul9gp 6 жыл бұрын

thanks very nice video plz keep it up

@dildarkhan6078 6 жыл бұрын

Sahil Sahil Shukriya bhai

@laptex1377 2 жыл бұрын

Always welcome 😁. Keep supporting and Sharing our videos ❤️

@dilipdhote640 3 жыл бұрын

Superb.

@laptex1377 3 жыл бұрын

Thanks brother 👍. Keep supporting and Sharing our videos ❤️

@manishchauhan1447 4 жыл бұрын

Very nice sir

@laptex1377 4 жыл бұрын

Thanks sir keep watching and comment which section you want us to explain in the next video

@wawandharmawan2441 4 жыл бұрын

Firstly, I want to thankyou for the Video. It's a very clear explanation, very helpfull, especially for the beginner like me. Secondly, I have a question about the laptop repair that I'm currently working on it. The first one, was a Toshiba E305 and it was done succesfully. This time I have a HP 14-B009AU. This is my second job on charging circuit, and I realy need help. The issue is the laptop can't turned on when powered by battery only. I checked the battery, and yes, one of the cell was drop to 0 volt. The battery model was VK04. So I ordered a new battery. So the battery now is new, and I just replaced it. But why the laptop it's still not coming on? I thought the battery voltage was too low, so I decided to charge it up. When the charger was plugged in, charging light was on, and the laptop can turned on, on Windows the charging icon indicate the the charging process was working fine. So I think there's no problem with the charging circuit. In the first few minutes. the charging current read about 1.5A. I think this is normal because the battery is low, and after a few minutes, it's should be lower than that. I turned off the laptop and let it charged for a few minutes. But what happened next was beyond my expectations. After about 10 minutes suddenly the charging current drop to 0. Oh no...I was worried there's something wrong. I checked the battery, and I found that one of the battery cell become hotter than the others (it's quite hot so you can't touched it more than 5 seconds). So I concluded the temperature sensor was protecting the battery. But why the temperature become so high? Of course because there is a overcurrent charging, right?. But why? After the battery is cold, I checked it again, and it's still doesn't work. There's no voltage comes out from it's terminals. I suspect the battery is damaged. So I was wondering there's something wrong with the charging circuit on the mainboard. I attach the battery into the laptop, and with the charger plugged in, I measured the charging voltage on the battery terminal, it was about 15 volts. I think it's not normal, and maybe this is why overcurrent occurs. But how does it possible? - Why does the charging system can't protect this situation? - Can some one help me, what part that possibly fail? Thanks.

@laptex1377 4 жыл бұрын

Check all the basic requirements of the charging section. VCC, DCIN, ACDET ACOK then u check whether the switching and the blocking MOSFETs are working properly or not. I hope u would be able to solve the problem with this in mind.

@wawandharmawan2441 4 жыл бұрын

OK, I have checked all the voltages around charging section and all seem to be normal. So my suspicion is on the battery pack itself, it's non-original one. After disassembly the battery pack I found 1 cell was bad (what a shame because it's a new one). The controller only contains 1 chip, 2 main mosfets, and some capasitors and resistors, and 1 transistor (I'm not sure). There is no EEPROM, and no NTC attached to the cell body like the original battery pack. I doubt how the temperature sensor works?. It's contains 4 cells connected in series, so the total voltage should be around 14-15V. It's answered my question earlier, why the charging voltage was 15V. After replacing the bad cell with a good one, I checked again, and everything's working fine.

@mumin4sure982 6 жыл бұрын

Lovely

@laptex1377 2 жыл бұрын

Thanks brother 👍

@viswanathancr2801 2 жыл бұрын

good video

@laptex1377 2 жыл бұрын

Thanks 😊. Keep supporting and Sharing our videos ❤️

@naveedjaan6772 8 ай бұрын

very good and nice thanks

@laptex1377 10 күн бұрын

Always welcome dear. Keep supporting and sharing our videos.

@nothingelsematters8217 Жыл бұрын

Keep good

@laptex1377 Жыл бұрын

Thanks bro. Keep supporting and sharing our videos

@pcmedicbiz 4 жыл бұрын

Very good! Can I ask, when there is no power and the laptop is running on battery, does the current from the battery flow through the internal diodes of both PQ703 and PQ704 to supply rest of motherboard?

@dildarkhan6078 4 жыл бұрын

No I think it's not the case during battery operation.

@laptex1377 2 жыл бұрын

No it's not the case.

@Swenser 3 жыл бұрын

If I need explanation of power delivery circuit in an email communication what is the cost including a few reply questions that I may ask if your description needs clarification? In particular Toshiba L850. There is the flow of signal and power I am confused about and purpose of some resistor and double diode around the charge ic. Can you help if I am willing to pay.

@laptex1377 3 жыл бұрын

WhatsApp +919031240767 For details

@sumuduasiri Жыл бұрын

Thanks very much🙏

@laptex1377 Жыл бұрын

Always welcome dear. Keep supporting and sharing our videos.

@sumuduasiri Жыл бұрын

@@laptex1377 definitely. Can we have your full English videos? I,m from Sri Lanka

@mechanicalpower9118 6 жыл бұрын

good class...

@dildarkhan6078 6 жыл бұрын

Azad Akber Thanks bhai....

@laptex1377 2 жыл бұрын

Thanks brother 👍

@velmuruganramaswamy639 2 жыл бұрын

Super

@laptex1377 2 жыл бұрын

Thanks 😊

@faisalshafique830 4 жыл бұрын

Awla Chaa Gya O Bhai

@laptex1377 4 жыл бұрын

Thanks brother. Keep supporting and Sharing our videos 🙏❤️

@zilicontech 3 жыл бұрын

@Laptex please I need your assistance. I'm having trouble with Asus N550JV the 19v passing through the power mosfets because the gate voltage is absent. I've tried all I can upto changing the charging IC 3 times but to no avail. Please help. I have 19v at vcc pin (pin 20), 0.7v at ac in (pin 2), ACOK at pin 5 is 0V. Please what can I do

@laptex1377 3 жыл бұрын

Your Charging Section requirements is not proper. ACOK, Acdet signal are not in the required range. So pls check thoroughly all the necessary requirements.👍

@zilicontech 3 жыл бұрын

@@laptex1377 thanks a lot, please can you guide me please? Here are the voltage I'm getting at the pins: 1 ACN 0.7v 2 ACP 0.7v 3 CMSRC 0v 4 ACDRV 0v 5 ACOK 0v 6 ACDET 2.5v 7 IOUT 0v 8 SDA 0v 9 SCL 0v 10 ILIM 0.1v 11 BATDRV 0V 12 SRN. 1.1V 13 SRP. 1.1V 14 GND 15 LG. 0V 16 REGN 6V 17 BST 5.8V 18 HG. 1.1V 19 LX. 1.1V 20 VCC 18.8V 21 GND 22. GND 23 GND 24 GND 25 GND Please help @laptex Thank you

@zilicontech 3 жыл бұрын

@laptex please can you be of help?

@jab_technology_228 3 жыл бұрын

Hello Sir, very powerful explantion in a good English. How can I get the complete video ?

@laptex1377 3 жыл бұрын

Thanks brother 👍. Keep supporting and Sharing our videos 😊.

@laptex1377 3 жыл бұрын

WhatsApp +919031240767 For details

@jab_technology_228 3 жыл бұрын

Please Sir How Can I get the complète video ???

@laptex1377 3 жыл бұрын

Contact on the given number for details

@TheAnu1998 4 жыл бұрын

ACOFF is disabled when the adaptor is inserted. In this case the what would be the voltage at the base of NPN transistor PQ109.

@TheAnu1998 4 жыл бұрын

PQ 109 is just above the signal BATT_TEMP

@TheAnu1998 4 жыл бұрын

PR133 is connected to the base of the transistor

@laptex1377 4 жыл бұрын

It will ground at the base of PQ109 to firm the voltage divider and switch the switching and blocking MOSFETs and pass 19V into the motherboard.🤝🤝

@laptex1377 4 жыл бұрын

Hope you got the answer.

@TheAnu1998 4 жыл бұрын

Thanks

@rptamiltech2.039 2 жыл бұрын

sir, what is the meaning DY in the schematic?

@laptex1377 2 жыл бұрын

It means that component is not available at that place.

@globalkphb Жыл бұрын

LA-8241P MB ACCOFF SIGNAL MISSING HOW TO SOLVE

@laptex1377 Жыл бұрын

Check requirements

@rosamariaamone5132 4 жыл бұрын

C-3PO is here he he!

@laptex1377 4 жыл бұрын

What???

@rosamariaamone5132 4 жыл бұрын

@@laptex1377 Star Wars character, no offense! , amazing videos !!

@laptex1377 4 жыл бұрын

Okay, thanks Maria keep supporting and sharing our content

@MohdDanish0136 5 жыл бұрын

Sir apki vedio me clear nahi dikhayi deta

@laptex1377 5 жыл бұрын

SORRY FOR INCONTINENCE. NOW THE LATEST VIDEO QUALITY HAS BEEN IMPROVED.

@unalakdogan9416 2 жыл бұрын

can you add subtitles

@laptex1377 2 жыл бұрын

Video is already in english bro...

@alienenergy1763 2 жыл бұрын

english subtitles please

@laptex1377 2 жыл бұрын

Already video is in English no need for sub titles bro.

@alienenergy1763 2 жыл бұрын

@@laptex1377 i can't understand your english

@laptex1377 2 жыл бұрын

If everyone else can understand it means it's fine...pls try yours

@alienenergy1763 2 жыл бұрын

@@laptex1377 If you don't want to add subtitles, you don't need literature.

@PatrickRibbsaeter 4 жыл бұрын

good videos are in english.. and not hindi

@laptex1377 4 жыл бұрын

It's an English video sir... we are planning to put videos on English now as well... pls share it so that we have enough English audience so that we will be motivated to create English content sir.

@PatrickRibbsaeter 4 жыл бұрын

Laptex thats very good, because the english market is massive now in laptop repair around the globe.. keep up the good work. thank you for educating the world

@laptex1377 4 жыл бұрын

You are welcome Patrick keep supporting and sharing our content we will be uploading more latest contents for our audience...

@viswanathancr2801 2 жыл бұрын

good video

@laptex1377 2 жыл бұрын

Thanks bro. Keep supporting and Sharing our videos 😊

@viswanathancr2801 2 жыл бұрын

good video

@laptex1377 2 жыл бұрын

Thanks 😊.