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Wster WS2911 Karaoke Mic

By Jestine Yong on February 22, 2025

Received Wster WS2911 Karaoke Mic, stating problem not working.

Inspected unit found it powering ON, Speaker also working but Mic is not working. Tried by sliding the Mic Volume but no effect.

Removed Top Cap of Microphone & PCB Area for inspection in any wire is broken.

Wires found OK. PCB seems neat & clean.

Checked Battery Voltages showing 4.1v, it is OK

Close look of PCB with parts

It is in my Practice Now to Highlight SMD CODES by applying Chalk Dust & keep the data for refer use.

My first attempt is Mic Volume control, I applied kerosene for cleaning purpose (It works as good as WD40) & slide the Controller pole for few times so that kerosene reach over carbon Trace of the controller.

Connected PCB Back to the power & turned it ON & mic is back to the Life. Sometime problems are not that much complicated.

Sharing some SMD Parts Code Pinout

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

P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.

Note: You can check his previous repair articles on How To Make Mosquito Killer?

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Microphone Repair

13 Comments

Parasuraman S

February 22, 2025 at 9:10 pm

Very professional fault finding and fix! Thanks for sharing datasheets and applications of a few important ICs too! Well, done dear Yogesh Bai!

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- Yogesh Panchal
  
  February 23, 2025 at 10:22 pm
  
  Thank You! Sir
  
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Waleed Rishmawi

February 22, 2025 at 11:29 pm

Thanks for the information shared. Quick and to the point repair steps. Have a blessed day

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- Yogesh Panchal
  
  February 23, 2025 at 10:23 pm
  
  Thank You!Waleed
  
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Albert van Bemmelen

February 23, 2025 at 12:59 am

Interesting repair. I wonder if the 6 pin PS3120A doubler chip also is used in the with 5V chargeable 1.5V Lithium ion batteries? Because one of both defect pcb chips has smd code HXN-MH. Like these with 5V chargeable lithium 1.5V batteries:
https://nl.aliexpress.com/item/1005004789337168.html

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- Albert van Bemmelen
  
  February 23, 2025 at 4:37 am
  
  In a second 5V chargeable li-ion 1.5V battery I found the same badly soldered chip with another SMD code 2DLF. Apparently the searched 6 pin chip is the XT2055Y42 which is a Standalone Linear Li-Ion Battery Charger with Thermal Regulation ic. And is not the wrong printed smd code that was on top of the other defect chip in the same type of 1.5V li-ion battery.
  They are sold on Aliexpress here: https://nl.aliexpress.com/item/1005002487380600.html?gatewayAdapt=glo2nld
  
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  - Yogesh Panchal
    
    February 23, 2025 at 10:47 pm
    
    Albert,
    2DLF also have 4.5V fixed charging output voltage.
    
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- Yogesh Panchal
  
  February 23, 2025 at 10:40 pm
  
  Thanks! ALbert,
  This IC's O/p is fixed to 4.9v as per the Datasheet can not used for 1.5v Battery.
  
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Mark J

February 23, 2025 at 5:04 am

Yogesh good job on the repair. I always enjoy your repair artilces.

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- Yogesh Panchal
  
  February 23, 2025 at 10:47 pm
  
  Thank You! Mark J
  
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MUYKIT

February 24, 2025 at 11:45 pm

Engineer Yogesh, nice restoration.

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Yogesh Panchal

February 25, 2025 at 10:22 pm

Thank you! MUYKIT

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Mervin Binda

March 7, 2025 at 12:10 am

great to see all these stuff

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