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The Xiaomi Poco F3 has a 6.67-inch AMOLED display with a refresh rate of 120 Hz and a touch sampling rate of 360 Hz. It is powered by the Snapdragon 870 5G. Released in March 2021.

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USB port data transfer not working

Kind of weird story, I have bought this used phone which looked like new, after about 3 days and some weird problems like signal loss it died. send it to warranty and instead of changing the phone they have offered repair and charged me money for it. anyway after repair I am able to charge the phone and fast charge is working but I don't have data connection. my friend is a mobile technician and he said he changed USB/daughter board and also reballed CPU and still it's not working but ye also said that data would work for a very short period and then stop working again.

also I have some experience repairing phones if it matters.

Any help would be very appreciated.

Thanks in advance

best regards.

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Hi @zze76jg7jjvqoqg

When you connect the phone to a computer, is there a notification asking you to select the type of USB connection you want to use?

If not, I realize that you said that the USB daughterboard was replaced but maybe check the pins 30 and 32 in the 40 pin flex cable connector are OK

Here's an image from the schematics showing where the CC1 and CC2 pins (cable attachment and removal detection, receptacle/plug orientation detection, and current advertisement function) connect to as well as the resistors mentioned by the schematic i.e. R6501 1 and R6502 1.

Block Image

(click on image)

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