Redmi note 3 not charging, the usb is dead, warning with chargers QC, possible fix.

[Kudeshido]

Thank you OP, for this quick tutorial and fix.:good:
In my case, Zener diodes were burned on both small board with USB port and main board.
I just scrapped them carefully with thin screwdriver, and now it's charging again.
I was thinking on getting a new phone, but I have more important things to spend cash on, so my kenzo stays with me until it breaks again, so far going strong for 3.5 years and second battery.

 

[poster74]

Hi,

I have Redmi Note 5 Pro and I Suspect the same issue.

It doesn't charge anymore, it will charge for 1 or 2 seconds and then stop for 2 seconds and start again etc. When it does charge, it charges at about 200mh (as seen from Ampere app).
I replaced with a new battery and USB charging port and still the same problem. I suspect that its the zenner diode on the motherboard.

The only problem is that I don't know where the diode is on the Redmi Note 5 Pro. There is a video that takes apart the entire phone (link below) and from the video I have attached 2 screenshots. To the side of the top usb flex cable, there is a tiny silver rectangle, is this the diode ? Any ideas?

I dont really know how to use a multimeter, but I managed to get 5V with one probe on the the charging going in and the other probe on the bottom usb socket, where the flex plugs in (yellow in the attached pic). However when I attached the probe to the top of the usb flex cable. I could not get a reading. Does this mean that the flex cable connector could be faulty and not the diode ?

I couldnt attached pic, but from the video you can see it at 3:40 and also 4:58

https://www.youtube.com/watch?v=EaQBX1v4sj4