A technician is troubleshooting a mobile device that was dropped. The technician finds that the screen (ails to rotate, even though the settings are correctly applied. Which of the following pieces of hardware should the technician replace to resolve the issue?

The accelerometer is a sensor within a mobile device that measures acceleration and detects the device's orientation relative to gravity. This functionality is essential for the auto-rotate feature of the screen. When a device is dropped, the physical shock can damage sensitive internal components like the accelerometer. Since the software settings for rotation are confirmed to be correct, the failure of the screen to rotate points directly to a hardware issue with the orientation sensor. Therefore, replacing the damaged accelerometer is the correct troubleshooting step to resolve this specific problem.

A. LCD: The LCD is the display screen itself. A failure would manifest as visual defects like cracks, dead pixels, or a blank screen, not a loss of rotation functionality.
B. Battery: The battery is the power source. A damaged battery would cause power-related issues, such as the device not turning on or holding a charge, but it does not affect screen orientation.
D. Digitizer: The digitizer is the touch-sensitive layer over the LCD. If it were damaged, the device would have unresponsive or inaccurate touch input, which is unrelated to screen rotation.

1. CompTIA. (2022). CompTIA A+ Core 2 (220-1102) Exam Objectives. Version 5.0. Section 1.4, under the "Features" subsection, explicitly lists "Screen orientation (accelerometer/gyroscope)," directly linking the accelerometer component to the screen orientation feature.

2. Android Developers. (n.d.). Sensors Overview. Google. In the "Motion sensors" section, the documentation states that accelerometers are used to "measure acceleration forces and rotational forces" and are "useful for monitoring device movement, such as tilt, shake, rotation, or swing." This confirms the accelerometer's primary role in detecting orientation changes for screen rotation.

3. Patterson, D. A., & Hennessy, J. L. (2017). Computer Organization and Design: The Hardware/Software Interface (5th ed.). Morgan Kaufmann. In Chapter 1, Section 1.6, "Trends in Cost," the text identifies components in a modern smartphone, stating, "MEMS (microelectromechanical systems) chips are used for the accelerometer and gyroscope, which allow the smartphone to sense its orientation" (p. 43).