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Power Bank Repaired

By on June 11, 2015
power bank repairings







I got this iFans power bank as a gift a few months ago, it’s quite handy to have when you are on the go for charging your cell phone or ipod and so on. It has 2 USB ports so you can charge 2 devices at the same time.

power bank repair

I was trying to charge my phone the other day and it wasn’t working. I thought maybe the power bank was drained of power and needed charging but when I plugged it to a charger it showed that the battery was almost full.

So I asked at home if anyone was using it and it turns out it fell on the floor while a phone was connected to it and after that it stopped charging.

power bank repairs

Nothing lights up when connecting a USB. So I opened it up and removed the circuit board (sorry forgot to take pictures of the disassembly). And then I noticed that the first USB socket was broken off the circuit board along with the solder traces.

power bank repairing


The first USB port removed where you can see how the leads are broken off. After tracing the wiring on the board with a multimeter, I found the 2 USB ports have the same +5V supply and since the first one wasn’t working as well.

power bankrepair

I decided to make 2 jumper cables and connect them together since the pads were ruined. The green wire is the +5V and white/green wire is ground. The two pins the in the middle are used for transferring data (d+ and d-) and since its only used for charging they are not used.


I soldered the battery back on and plugged in my phone and it was working again.


This article was contributed by Ibrahim Safa from Lebanon. He works as a computer and electronics technician in a computer company fixing laptops, desktops, printers and solving networking problem.
He enjoys doing repairs and troubleshooting even on my free time.

Please give a support by clicking  on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.

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  1. Robert Calk

    June 11, 2015 at 12:20 pm

    Good job, Ibrahim. Thanks for sharing the repair with us.

  2. Shiharan Choudhury

    June 11, 2015 at 6:57 pm

    Appreciate the effort, but these days most of the power banks comes in with a uni body construction, so dissembling them is a real big deal, and at times those metallic ones are impossible to open.

  3. Humberto

    June 11, 2015 at 8:23 pm

    Good repair Mr. Ibrahim Safa.
    By the way, the Computer Company where you repair has a website?
    Have a nice day

    • Ibrahim Safa

      June 13, 2015 at 6:39 pm

      Hi Humberto,
      this is the website

  4. mabrouk

    June 11, 2015 at 10:17 pm

    good job thanks a lot for sharing ibrahim

  5. Taring K Arioka

    June 11, 2015 at 10:53 pm

    Nice article. Thanks for sharing.

  6. Waleed Rishmawi

    June 12, 2015 at 12:35 am

    Mabrook. congrats on the successful repair. thanks for sharing your repair info with us.

  7. Andre Gopee

    June 12, 2015 at 1:38 am

    Nice and easy job. Thanks for sharing.

  8. Yogesh Panchal

    June 12, 2015 at 2:21 pm

    Good Effort thanks for sharing the experience.

  9. sam montero

    June 13, 2015 at 7:31 pm

    Good job. I own one but I have not seen the inside of it yet. If I have time Ill make a diagram
    of it. Thanks for the info.

  10. Rod

    November 12, 2015 at 5:01 pm

    That was great job ibrahim, thanks

  11. suryadev

    December 11, 2015 at 6:43 pm

    You have done a good job
    Thanks for sharing the info

  12. Dinesh Yadav

    February 10, 2016 at 3:49 pm

    Hello Ibrahim thanks for ur sharing I have same problem with my power bank but issue is how to open my metal body there is no screw or unlock system to open it for fixing its MI power bank plz suggest how to open up.

  13. chris Paul

    March 31, 2016 at 10:09 pm

    my power bank is not giving out voltage and also when I charge my powerbank it wont charge or wont show a sign of of charging.. please help me out

    • Jestine Yong

      April 4, 2016 at 8:02 am

      Hi Chris,

      You may have to open it up and check for weak batteries.


  14. Okpala Uche

    July 17, 2016 at 6:29 am

    My Power Bank having been charged for a long time stil shows one Led light and can't charge my phone.
    What do I do??

    • Jestine Yong

      July 18, 2016 at 1:25 pm

      Hi Okpala,

      Check to see if the battery voltage is depleted or not. if it is too low then it would be difficult to charge it. You may use an external charger to charge it or direct replace with new batteries.


  15. tonn

    February 11, 2017 at 9:00 am

    hi so what if my powerbank is metallic and it won't charge how do i fix it?

    • Jestine Yong

      February 13, 2017 at 8:40 pm

      HI Tonn,

      Make sure the batteries are good first before checking on the circuit board. After few years in service the batteries usually will go bad first.


  16. Clinton Vegaz Ifeanyichukwu

    April 30, 2017 at 5:07 pm

    Hello sir, i have a Tecno power bank.

    It get full within an hour +, but when i start using it with my phone, it doesn't last up to 20%.

    Please tell me what went wrong??

    • Jestine Yong

      May 2, 2017 at 10:42 am

      Hi Clinton,

      How long has you been using the power bank? It could be the battery can't sustain the current draw.


  17. ashish

    July 16, 2017 at 10:45 am

    Hello sir,
    Yesterday my ambrane powerbank 20000 mAh with 3 usb port was working well. And now it does not giving any output when I press power key to see remaining battry, neither light up led light nor charging the phone. While charging it only blink 1st led for a while, after that all led light up and stop blinking.

    • Jestine Yong

      July 17, 2017 at 2:14 pm

      Hi Ashish,

      How long you have been using this power bank? Have you opened it up and check the battery voltage?



      • ashish

        July 17, 2017 at 8:19 pm

        I am using this since 3 or 4 month. Yes battery is fine.

        • Jestine Yong

          July 19, 2017 at 1:43 pm

          HI Asish,

          Probably the mainboard have problem.There is not much thing you can do because there was no info about this type of circuit board. What you can do is to reflow the ICs and do some cleaning using IPA. If the memory ICs is corrupted there is no way to find one unless you can find the exact same model to copy it out.



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