bought a mobile phone and received a Xiaocroton mobile power supply as a gift. It worked well at first and lasted a long time. However, I accidentally plugged in the wrong voltage plug and the circuit board burned. Only the indicator light is on, and it cannot be charged or discharged. Afraid of the power bank exploding, I left it in the basement for several days with the indicator light always on. I plan to repair it and understand its internal structure.
struggled to pry open the casing and saw that the motherboard was indeed burned. Comparing to buying a circuit board online, it is exactly the same. Comparing the wiring, remove the red wire and connect it to the red wire, and remove the black wire and connect it to the black wire. Just after connecting it, it burned again. It says on the website that if you connect it in reverse, it will burn. After careful inspection, I discovered that in the Xiaocroton mobile power supply, the red wire was connected to the negative pole, and the black wire was connected to the positive pole. Black and red were properly reversed. Upside down black and red then, the indicator light is on.
Reverse the black and red wiring
Look carefully, 2 of the 5 batteries are different, these two seem to have no wiring. When I took the outer shell apart, I praised Xiaocroton for being a good product and being able to install 5 batteries. Unlike some unscrupulous merchants who put cement blocks inside, Xiaocroton did not put cement blocks and could hold 5 batteries. It looked like there was no wiring, so I took it apart and inspected it carefully, and found that there was no wiring. After another test, I found that these two sections had no power at all, and they looked like they were scrap or fake. Praise it for nothing. What to do with
, buy another motherboard?
