Most current smartphones and tablets use laminated or in-cell/on-cell designs in which the capacitive digitizer is bonded to, or fabricated within, the LCD or OLED panel. Because these layers are permanently fused, repairing a failed touch screen usually requires replacing the entire glass/touch/display assembly rather than a stand-alone digitizer. Loss of touch response, however, can also stem from software faults, loose flex cables, or other hardware issues, so the sensor itself is not always the root cause.
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