The USB-C connector has a lot more pins than the previous generation USB connectors and therefore a lot more possibility for things to go wrong with it. From your description my guess would be that you've got intermittent or broken connections between some of the pins on the daughter card that holds the USB-C connector and the connector itself.
The downside of a USB-C connector is that it's a lot more difficult to replace on a circuit board than the older models, but on your phone it's not a bad situation as the daughter card can be replaced by itself. I wasn't able to find any iFixit-style guides showing that particular repair, but if you follow the loudspeaker replacement guide, that opens the phone up right where you need to expose the daughter card that has to be swapped out.
[guide|152592|Xiaomi Poco F3 Loudspeaker Replacement - iFixit Repair Guide|new_window=true]
I did locate a YouTube video that shows the exact procedure; once you get the speaker out it's actually just a matter of unplugging a coax cable and one FPC connector and the daughter card just pops right out.
[link|https://www.youtube.com/watch?v=g-voVCWxwr4|Xiaomi Mi 11X - Poco F3 Charging Port Replacement - Redmi K40 Pro - YouTube|new_window=true]
It looks like the port itself isn't hard to find; several came up on my cursory search. You can find them on Amazon, eBay and AliExpress, among others. Here's just the first one I came across.
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[link|https://www.aliexpress.us/item/3256802627590920.html|Charging Port For Xiaomi Mi Poco F3 Redmi K40 Charge Board USB PCB Ribbon Dock Connector Flex Replacement Spare Parts - AliExpress|new_window=true]
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[link|https://www.aliexpress.com/i/3256803147948069.html|Original For Xiaomi Poco F3 Usb Charging Port Flex Cable With Ic Support Fast Charging Charger Pcb Dock Connector Board Parts - Mobile Phone Flex Cables - AliExpress|new_window=true]
That should get you going! Best of luck and let us know how it turns out!
The USB-C connector has a lot more pins than the previous generation USB connectors and therefore a lot more possibility for things to go wrong with it. From your description my guess would be that you've got intermittent or broken connections between some of the pins on the daughter card that holds the USB-C connector and the connector itself.
The downside of a USB-C connector is that it's a lot more difficult to replace on a circuit board than the older models, but on your phone it's not a bad situation as the daughter card can be replaced by itself. I wasn't able to find any iFixit-style guides showing that particular repair, but if you follow the loudspeaker replacement guide, that opens the phone up right where you need to expose the daughter card that has to be swapped out.
[guide|152592|Xiaomi Poco F3 Loudspeaker Replacement - iFixit Repair Guide|new_window=true]
I did locate a YouTube video that shows the exact procedure; once you get the speaker out it's actually just a matter of unplugging a coax cable and one FPC connector and the daughter card just pops right out.
-
[link|https://www.youtube.com/watch?v=g-voVCWxwr4|Xiaomi Mi 11X|new_window=true]
+
[link|https://www.youtube.com/watch?v=g-voVCWxwr4|Xiaomi Mi 11X - Poco F3 Charging Port Replacement - Redmi K40 Pro - YouTube|new_window=true]
It looks like the port itself isn't hard to find; several came up on my cursory search. You can find them on Amazon, eBay and AliExpress, among others. Here's just the first one I came across.
[link|https://www.aliexpress.us/item/3256802627590920.html|Charging Port For Xiaomi Mi Poco F3 Redmi K40 Charge Board USB PCB Ribbon Dock Connector Flex Replacement Spare Parts - AliExpress|new_window=true]
That should get you going! Best of luck and let us know how it turns out!
The USB-C connector has a lot more pins than the previous generation USB connectors and therefore a lot more possibility for things to go wrong with it. From your description my guess would be that you've got intermittent or broken connections between some of the pins on the daughter card that holds the USB-C connector and the connector itself.
The downside of a USB-C connector is that it's a lot more difficult to replace on a circuit board than the older models, but on your phone it's not a bad situation as the daughter card can be replaced by itself. I wasn't able to find any iFixit-style guides showing that particular repair, but if you follow the loudspeaker replacement guide, that opens the phone up right where you need to expose the daughter card that has to be swapped out.
[guide|152592|Xiaomi Poco F3 Loudspeaker Replacement - iFixit Repair Guide|new_window=true]
I did locate a YouTube video that shows the exact procedure; once you get the speaker out it's actually just a matter of unplugging a coax cable and one FPC connector and the daughter card just pops right out.
[link|https://www.youtube.com/watch?v=g-voVCWxwr4|Xiaomi Mi 11X|new_window=true]
It looks like the port itself isn't hard to find; several came up on my cursory search. You can find them on Amazon, eBay and AliExpress, among others. Here's just the first one I came across.
[link|https://www.aliexpress.us/item/3256802627590920.html|Charging Port For Xiaomi Mi Poco F3 Redmi K40 Charge Board USB PCB Ribbon Dock Connector Flex Replacement Spare Parts - AliExpress|new_window=true]
That should get you going! Best of luck and let us know how it turns out!