Examkin

Question

Difficulty: EasyMobile Device Hardware and Display Issues

Match each mobile device hardware or display symptom to its most likely root cause or component failure.

  • A smartphone display retains permanent faint ghost images of a navigation bar after extended static display.OLED screen image retention / burn-in
  • A mobile tablet touchscreen registers touch taps several centimeters away from where the user actually touches the screen.Faulty or uncalibrated digitizer
  • A mobile device camera produces blurry images and continuous buzzing noises when attempting to focus on distant objects.Malfunctioning optical image stabilization (OIS) module
  • A laptop screen flickers or distorts intermittently only while the user adjusts the display lid angle.Loose or pinched video ribbon cable passing through the hinge

Answer

1. Permanent faint ghost images matches OLED screen image retention / burn-in.
2. Touchscreen registering taps far from touch location matches Faulty or uncalibrated digitizer.
3. Blurry images with continuous focus buzzing matches Malfunctioning optical image stabilization (OIS) module.
4. Screen flickering while adjusting lid angle matches Loose or pinched video ribbon cable passing through the hinge.
Each symptom correlates directly to specific mobile component behaviors: OLED burn-in causes permanent ghost images of static icons; digitizer failure causes inaccurate touch coordinate mapping; failed optical image stabilization (OIS) causes motor buzzing and image blur; and display ribbon cable damage in the hinge causes flickering strictly tied to lid movement.

Step-by-Step Solution

1
Analyze static image ghosting symptom on modern mobile screens.
Identify that OLED displays experience uneven diode degradation when static images are shown continuously, leading to burn-in.
Ghosting of static navigation elements is a classic indicator of OLED burn-in.
2
Analyze touch offset symptoms on tablet displays.
Correlate coordinate translation errors to the digitizer glass layer.
The digitizer converts analog touch points into digital touch coordinates; calibration errors or failure cause offset registration.
3
Analyze camera focus and buzzing noise symptoms.
Identify the optical image stabilization hardware component within the mobile camera module as the source of motor noise and focus failure.
Physical drops often damage the delicate electromagnetically suspended OIS coils.
4
Analyze movement-dependent laptop display flickering.
Isolate the issue to the video signal cable routed through the physical display hinge.
Mechanical friction and movement in the hinge degrade or loosen the video ribbon cable wires over time.

Key Concept

Mobile Device Hardware & Display Troubleshooting
Rate this question

Topics

Mobile Device Hardware and Display Issues

More questions from this topic