ACMT Display & Video Troubleshooting 2

Question 1

A MacBook's display has lines running vertically across the screen after a drop. What is the most likely cause?

Accepted Answer

Cracked display panel or damaged LCD flex cable

Answer

Corrupt GPU driver

Answer

NVRAM issue

Answer

Incompatible macOS version

Question 2

What is 'image retention' on a Mac display, and how is it typically addressed?

Accepted Answer

A temporary ghost image left on an LCD after displaying a static image; may clear with normal use or a display test

Answer

Pixels that are permanently dead; requires display replacement

Answer

A GPU memory error requiring a logic board swap

Answer

A macOS software rendering bug

Question 3

Which Apple tool allows a technician to adjust display color profiles and run uniformity tests on a replacement iMac display?

Accepted Answer

AST 2 Display Diagnostics

Answer

ColorSync Utility

Answer

Night Shift Settings

Answer

Magnifier accessibility feature

Question 4

A MacBook Pro with a Retina display has bright white spots or 'blooming' around dark areas. What does this indicate?

Accepted Answer

Backlight bleed through the LCD layers, often from pressure or a failing display

Answer

A software rendering issue

Answer

GPU overheating

Answer

Incorrect color profile

Question 5

After replacing a MacBook display assembly, the technician notices the ambient light sensor is no longer adjusting brightness. What was most likely missed?

Accepted Answer

The ambient light sensor cable was not reconnected during the display replacement

Answer

Auto-brightness was not enabled in System Settings

Answer

The GPU needs a firmware update

Answer

SMC was not reset

Question 6

What is the recommended procedure when a MacBook display has been replaced with an Apple-genuine part but True Tone is not working?

Accepted Answer

Use AST 2 to run the True Tone calibration process which serializes the display to the Mac

Answer

Replace the display again

Answer

Reset NVRAM

Answer

Reinstall macOS