ACMT Display & Video Troubleshooting

Question 1

A MacBook Pro's built-in display shows a pink or purple tint after replacement. What is the most likely cause?

Accepted Answer

Display data cable not fully connected or damaged

Answer

A color tint on a replaced display is most commonly caused by a display data cable that is not fully seated or was damaged during the repair.

Question 2

Which test in Apple Service Toolkit 2 (AST 2) verifies that a replacement display is functioning correctly?

Accepted Answer

Display Test (including backlight and pixel tests)

Answer

AST 2 includes a Display Test that checks backlight uniformity, pixel defects, and color accuracy, which must be run after every display replacement.

Question 3

An iMac displays a blank screen but a startup chime is heard and the Mac responds to keyboard commands. What is most likely faulty?

Accepted Answer

Display assembly or its connection to the logic board

Answer

If the Mac is booting and responding (evidenced by the chime and keyboard response) but no image is visible, the display assembly or its connection is the likely fault.

Question 4

What standard pixel defect policy does Apple use to determine if a built-in display replacement is warranted?

Accepted Answer

Apple's bright or dark pixel policy, which defines acceptable thresholds before replacement

Answer

Apple has a documented bright pixel and dark pixel policy that specifies the number and location of pixel defects that qualify a display for replacement under warranty.

Question 5

A customer connects an external display to their MacBook via USB-C, but no image appears. What should the technician check first?

Accepted Answer

Cable compatibility and whether the USB-C port supports DisplayPort Alt Mode

Answer

Not all USB-C cables support DisplayPort Alt Mode required for video output; verifying the cable and port support for video is the first troubleshooting step.

ACMT - Apple Certified Macintosh Technician Practice Test

ACMT - Apple Certified Macintosh Technician Practice Test

ACMT Display & Video Troubleshooting