Here's the solution for Nokia 6124c with USB not detected problem if being connected to the personal computer. This solution also shows the connection line paths of the USB pin connector that may also help fix for lifted or damaged USB connector. To fix this problem, you may first clean the USB pin connector of the phone, then check for possible damaged or loosen solders of its terminal.
If the USB pin seems okay, you may refer to this solution below and locate the components highlighted on it.
Nokia 6124c USB Pin Connector Jumper Solution
Locate the USB filter IC, you may check it first and try to clean its surroundings and then do a replacement if found damaged. For lifted PCB board solder pads, you may use the solution above for reconnecting the USB terminal down to the USB filter chip.
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