Device Hardware & Software Flashcards

A customer's smartphone charges very slowly even with the original charger. After ruling out the cable, what component should a technician inspect next?

Answer: Charging port for debris or damage

A damaged or debris-filled charging port creates resistance that reduces charging current, causing slow charging.

Which memory type in a mobile device retains data without power and stores the operating system?

Answer: NAND Flash (eMMC/UFS)

NAND Flash (eMMC or UFS) is non-volatile storage that retains data without power and holds the OS and user data.

A technician replaces a cracked display on a smartphone, but touch response is erratic afterward. What is the most likely cause?

Answer: Digitizer connector not fully seated

An improperly seated digitizer connector causes erratic or unresponsive touch input after a screen replacement.

What does the term 'SoC' refer to in mobile device hardware?

Answer: An integrated circuit combining CPU, GPU, modem, and memory controller

SoC (System on a Chip) integrates CPU, GPU, modem, and other subsystems onto a single die for efficiency and performance.

A mobile device fails to detect a newly inserted SIM card. After confirming the SIM is valid, what should the technician check?

Answer: SIM card tray and SIM reader contacts

Bent or dirty SIM reader contacts prevent the device from detecting a valid SIM card.

Which component is responsible for measuring a device's orientation and rotation for screen auto-rotate?

Answer: Gyroscope

The gyroscope measures angular rotation and enables features like screen auto-rotate and gaming motion controls.

A technician is repairing a water-damaged phone. Which action should be performed FIRST after disassembly?

Answer: Rinse with isopropyl alcohol (90%+) and inspect for corrosion

Rinsing with high-purity isopropyl alcohol removes mineral deposits from water and stops ongoing corrosion before further damage occurs.