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Genuine Samsung Cellphone Charger Repaired

By Jestine Yong on October 16, 2012

Specification

Input :100-240 v AC 50-60Hz 0.15A

Output: 4.75 v DC 0.4 A

Made in china

SMPS PRINCIPLES CHARGER CIRCUIT

The circuit of this charger is designed to run on two ac input voltages i.e the 100V and 240 V. The AC wide range input of 100-240 V is possible because of special diodes 4 X 1A7H were in use as bridge rectifiers. It can handle the voltages within tolerance of 100-300 volt AC. Of course the filter cap must also be able to support up to 400 VDC.

The problem of this charger was no dc output from the socket. From my previous repair experience the common fault for this type of charger were broken wire and socket.

The first thing I do was to soldered an AC wire cord to the AC terminal to turn on the charger so that I can check on the DC terminal output with a voltmeter. The reason I soldered the AC wire cord is because I have removed the cover and left only the circuit board.

AC CORD IS SOLDERD TO THE AC TERMINALs OF CELLPHONE BOARD

GENIUNE SAMSUNG CELLPHONE CHARGER CIRCUITE BOARD

VERY IMPORTANT NOTICE : Be careful with the AC 220V when handling this charger!!!!!

When I’d got 5 volt output at the DC terminal this means the wire have problem. Replacement with a new wire brought the charger back to life again.

DC Wire and Socket

SMD side of the charger

Note: SMD components can be found in the Genuine charger circuit board but not the immitation one.

Shotteky diode in one side of the circuit board of samsung genuine charger JC2W= BAL74 SOT 23 HIGH SPEED DIODE

Please be informed that your cell phone charger repair knowledge can be used to expand on any other battery chargers like Shavers battery chargers, Drill battery chargers, Mixers battery chargers and etc. This is also a good source of income for repairers. Millions of faulty chargers are ready to repair by you.

Hope this article helps!

Mr Beh

Note: Please do not attempt to perform the repair work if you do not know about electrical safety.

If you have any interesting repair article that you want to share to others please do email me.

I encourage you to leave your comments on the post, as well as share the post with anyone you feel may benefit from it using the social media buttons below-thanks.

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17 Comments

badr

October 17, 2012 at 11:42 am

i want to thank you mr jestine my information increase day by day when i read in your web

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Colin Mitchell

October 17, 2012 at 2:34 pm

The following is badly worded:
The circuit of this charger is designed to run on two ac input voltages i.e the 100V and 240 V. The AC wide range input of 100-240 V is possible because of special diodes 4 X 1A7H were in use as bridge rectifiers. It can handle the voltages within tolerance of 100-300 volt AC. Of course the filter cap must also be able to support up to 400 VDC.

Should be:

The circuit of this charger is designed to run on a voltage from 100V to 240 V. The wide AC range input of 100-240 V is possible because the circuit picks off a small portion of the waveform and the “area under the graph” represents the energy delivered to the output.
The 1A7H diodes used in the bridge rectifier are rated at 400v and the filter cap must also be able to withstand up to 400 VDC.

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ibrahim

October 17, 2012 at 7:59 pm

This is fantastic repair work. But at times it is the 400v capacitor that has swollen up . Thanks for sharing.

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Peter

October 18, 2012 at 8:15 am

Nice Post. sometimes we spend a lot of time looking at the componets not knowing that its just the wires that are brocken. This saves time. Thanks for informing us.

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James

October 19, 2012 at 2:59 am

Thanks Mr. Beh.
Once again thanks for the post. It will help someone save a penny and also make some. A penny saved is much worth than a penny spent.

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beh

October 19, 2012 at 2:38 pm

HI MR JAMES
yes. but this worth more than a penny because if you repair your genuine charger and not buy a immitation cheap cellphone charger you saved your genuine battery and therefore you saved your precious cellphone becasuse also immitation cheap batteries are in the market . i refer you to two last articles in this subject
thanks
beh

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beh

October 19, 2012 at 8:49 pm

HI MR COLIN
yes. in another words the AC input voltages directly solderd to diodes and these diodes can handel AC between 100-300 V 50/60 H z . also the filter caps are supporting this by thier value 4.7microfarad 400v
thanks-beh

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teody ramos

October 20, 2012 at 4:24 am

i have a problem with my lenovo netbook charger ,I think it not working properly because my netbook works with the battery operated while it's not working when, I plug the socket of the charger to the wall outlet .May, I know it's
possible to repair the charger or its better to a new one? Thanks more power supports ...

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- Jestine Yong
  
  October 20, 2012 at 7:32 am
  
  Hi Teody,
  
  Since the charger already have problem there is no harm trying. Before that you have to make sure that the charger does not have any output. Open up the charger and begin to troubleshoot but make sure you know what you are doing because it involve live AC electricity.
  
  Jestine
  
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beh

October 21, 2012 at 9:27 am

HI PETER
yes most time as long as you open the chargers cover you can see the problem by your eyes
beh

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beh

October 21, 2012 at 10:24 am

HI PETER
like broken DC or AC wire from the board or smoked diode or resistors or bulged filter caps and so andso.......
beh

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beh

October 21, 2012 at 3:58 pm

HI EBRAHIM
thanks . but in this charger board the filter caps are ok
beh

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rambo

November 1, 2012 at 10:16 am

what kind of diode is jc2w it has five terminals or leg, what the schematic?

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- Jestine Yong
  
  November 2, 2012 at 3:03 am
  
  Hi Rambo,
  
  Kindly send a photo to my email at jestineyong(at)electronicrepairguide.com at means @ for me to check it out.
  
  Jestine
  
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beh

November 2, 2012 at 10:50 am

HI RAMBO
yes this is a shottkey diode with 5 leg and for sure is not one diodethis is several diodes in one package
this need the diagram of this chip to answer correctly
beh

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raymundo saura

November 9, 2013 at 8:45 am

thanks another knowledge added thanks and GOD bless

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Abdul Latif

December 15, 2016 at 10:07 pm

Dear sir, i have 5v dc nokia cell phone charger but output voltages are 8vdc, how repair this kind of prblem ?
thans

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