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Lenovo Laptop Adapter Repaired For Not Charging Problem

By Jestine Yong on December 4, 2020

Customer has delivered this laptop charger for repair. Stating problem as above. On arrival I did voltage testing on Dc output Pin it shows 2.3V DC instead of 19V DC. This is not normal reading so I opened the adapter.

I am not sharing the opening process because it was shared in my previous articles because majority on this type of adapters process is same.

Visually Checked Component side of the PCB everything seems to be OK

On Solder side of the PCB I found some Moisture. So I cleaned it with IPA.

further visual checking I used magnifying glass and under the lens I found some dry solder points. On DC O/P Diode.

After retouching the solder I have checked dc output voltage I found 20V as desired voltage.

I reassembled the laptop charger for ready to pick up.

This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.

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Note: You can check his previous repair articles in the link below:

https://jestineyong.com/tv-set-top-box-repaired/

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laptop charger repair

13 Comments

Parasuraman S

December 4, 2020 at 6:21 pm

Well done!

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- Yogesh Panchal
  
  December 6, 2020 at 3:18 pm
  
  Thank you! sir
  
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Peter from Holland

December 5, 2020 at 1:30 am

That kind of multimeter will eventually kill you! Very unsafe.. blows up!
If you love your healthy life ,buy a better protected one e.g. Fluke 177 or better..

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- Albert van Bemmelen
  
  December 5, 2020 at 3:15 pm
  
  A warning is never wrong Peter but that never happened with any cheap DMM of mine before! And as you know all of them must have safety fuses inside I wonder what you were measuring that your meter got blown up? If you mean the thin measuring cables you may be right but Fluke is a way to expensive meter that still does the same as any cheap(er) meter does.
  
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  - Yogesh Panchal
    
    December 6, 2020 at 3:32 pm
    
    You are right Albert,
    most of incidence is happens due to miss operating.
    
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- Yogesh Panchal
  
  December 6, 2020 at 3:27 pm
  
  Sir, using this meters since last 15 Years without any problem depends what your need and how you are using it.some time expensive equipment also fail.
  have a good day.
  
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  - Albert van Bemmelen
    
    December 7, 2020 at 2:05 pm
    
    Most of those handy Fluke portable oscilloscope meters are defect after they have been used for about 10 years, and fixing those is almost impossible (because of Firmware issues and other issues) and if you send the device in to their service center it will be way too expensive anyhow!
    
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Albert van Bemmelen

December 5, 2020 at 5:33 am

Even without using a magnifying glass the dry solder points were easily visible on your detailed photos. So the moisture probably wasn't the problem here. Good to see nothing was damaged.

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- Yogesh Panchal
  
  December 6, 2020 at 3:36 pm
  
  Albert, Agree problem is with dry solder only used magnifying glass to find out that is there PCB traces having some hair line crack or not.
  
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Imoudu Onwumah

December 5, 2020 at 11:07 pm

Mr Albert,I have experience a blown dmm 2ce.Dt9205A blow while using it .Though I made mistake of putting it in capacitance mode while measuring voltage and an ic got burnt inside.Hoping to repair it soon by replacing the ic.

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- Albert van Bemmelen
  
  December 7, 2020 at 1:54 pm
  
  Understood Imoudu. I hope you will be able to replacing the blown IC in your DMM. And that you still are able to read the IC markings on top of that component after it blew up. If you read my DY294 repair from around 2016 you'll find that it was possible to replace the 44 pins smd chip in that DMM too. Best of luck!
  
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  - Albert van Bemmelen
    
    December 7, 2020 at 2:00 pm
    
    By the way: if you own one of those handy atmega328 transistor testers you better never measure any charged capacitor with those meters. It will blow your AVR ATmega processor to kingdom come in an instant. After you will have to replace the ATmega chip with a new firmware flashed one! I speak out of experience. (It already happened to me twice!)
    
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johan fernandez

January 28, 2021 at 12:35 pm

EXCELLENT WORK A CONCERN HOW DID YOU OPEN THE PLASTIC COVER OF THE LAPTOP CHARGER? I heat it around the edges with the heat station?

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