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Display & Video Troubleshooting Flashcards

6 cards from real ACMT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Display & Video Troubleshooting flashcards as text

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

    Answer: Cracked display panel or damaged LCD flex cable

    Vertical lines on the display after physical impact almost always indicate a cracked LCD panel or a damaged flex cable rather than a software issue.

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

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

    Image retention is a temporary phenomenon where a ghost of a previous image lingers on the LCD; running a white or grey screen for several minutes often clears it.

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

    Answer: AST 2 Display Diagnostics

    AST 2 includes display diagnostic tests that check for backlight uniformity, color accuracy, and pixel defects following a display replacement on iMac and MacBook models.

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

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

    Backlight bleed is light from the LED backlight leaking around the edges or through the LCD panel, commonly caused by physical pressure or a degrading display assembly.

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

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

    The ambient light sensor has its own cable that must be reconnected when replacing a MacBook display assembly; missing this step disables automatic brightness adjustment.

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

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

    True Tone requires a calibration step in AST 2 after display replacement so the display's color sensors are matched and serialized to the specific Mac.