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Old Mobile Charger Repaired

By Jestine Yong on December 28, 2024

Same charger I repaired a few months’ back, I used for my magnifier glass. It was working fine after repair but one day I was using the magnifier and suddenly it went off.

Last time I replaced one Capacitor which causing LED flickering problem. Again I opened the adapter for inspection. Physically seems ok with no dry solder, no burn out. I took out my Multimeter & checked AC 220v input on wires showing OK.

But no voltage after primary Diode now I started cold testing. Found 8.2v Zener diode dead short.

Removed Diode for testing it outside.

Now tested other components also for testing but rest of the things seems OK. No shorting further hence took out replacement diode from my diode box. Soldered on its place applied voltage but still no output.

Now I removed Transistor marked with MJE X13001 & on testing I found this transistor was totally opened circuit.

I found one salvaged transistor marked with 13001 & tested with my Multimeter it shows different pinout (Not as per the PCB), I confused & searched on net here also I got some confusing results for 13001 pinouts. Original Transistor as per PCB Connection should be like.

Searched for more options in my component box I found one 13003 marked transistor testing with Multimeter it shows same pin out as per the PCB. Checked datasheet of 13003 but not sure about data of Original Bad Transistor.

So here I have to take a chance. Hence I replaced the 13001 transistor with 13003 transistors.

After replacing components, I connected the adapter to the power board.

Checked O/p Dc voltage on USB socket it shows 5.2v seems OK & Adapter is working now.

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 on Battery Operated Mini Color Stirrer Repaired For Not Working

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12 Comments

Parasuraman S

December 28, 2024 at 5:18 pm

That is very good repair work and thanks for sharing. 13003 is better rated and it can be used.

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- Yogesh Panchal
  
  December 30, 2024 at 1:06 am
  
  Thank You! Sir
  
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Albert van Bemmelen

December 29, 2024 at 2:01 am

This sort of repair complete with good detailed pcb circuit work are a real treat for me and probably many other electronic reader enthousiasts!
PS: the STX13005 is probably even better (Uce 700V /Ic 3A) and has the same TO-92 size. Probably the same pinconfiguration but are sadly harder to find online!

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- Albert van Bemmelen
  
  December 29, 2024 at 4:52 am
  
  PS: about 50 of those STX13005 on eBay cost about 13,50 dollar with 7,40 dollar on shipping cost.
  https://www.ebay.com/itm/283777887378
  
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  - Yogesh Panchal
    
    December 30, 2024 at 1:08 am
    
    OK Thanks!
    
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- Yogesh Panchal
  
  December 30, 2024 at 1:07 am
  
  Thanks!Albert
  
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Imoudu.O

December 29, 2024 at 2:49 am

Good repair, 13003 v5an accommodate higher voltage i guess.

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- Yogesh Panchal
  
  December 30, 2024 at 1:16 am
  
  Imoudu.O
  Power Dissipation of 13003 is 25W & for 13005 is 20W.
  
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Mark J

December 29, 2024 at 4:43 am

Yogesh good job on the repair.

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Yogesh Panchal

December 30, 2024 at 1:16 am

Thanks! Mark J

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Waleed Rishmawi

December 30, 2024 at 2:12 am

Yes, I get this kind of confusion sometimes when checking the internet about parts but you did it and brought the device back to life. Thanks for sharing

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- Yogesh Panchal
  
  December 30, 2024 at 3:56 pm
  
  Thanks!Waleed
  
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