A user reports that the fingerprint reader on her corporate smartphone stopped responding after the device was dropped. Rebooting, deleting saved fingerprints, and updating the OS have not restored the function. While inspecting the phone you confirm that swiping or pressing on the sensor produces no haptic feedback or enrollment activity. Which replacement would most likely restore the lost near-field scanner capability while leaving other components intact?
On most smartphones the fingerprint reader is a self-contained near-field scanner module that connects to the motherboard by its own flex cable. Physical shock can crack the reader surface or break the tiny ribbon, preventing the sensor from registering any touch. Replacing the fingerprint sensor assembly (often integrated into the home-button or rear pad) restores biometric function without affecting cameras, antennas, speakers, or the display. The screen assembly, Wi-Fi antenna, earpiece speaker, and proximity sensor are separate parts and would not resolve a failed fingerprint scanner.
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What is a near-field scanner?
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How does a flex-cable work in smartphones?
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Why wouldn't replacing the LCD or speaker fix the fingerprint sensor issue?