MacBook Pro (13-inch) Symptom Charts — Display 64
2010-09-14
3. Verify if LCD backlight is on
by looking for faint glow
from display when viewed
in darkened room with
brightness adjusted to full.
Yes Video signal from system
to external video is OK, LCD
backlight is on. Go to step 5.
No Go to step 4.
4. Shine bright (low heat)
ashlight into the front of LCD.
Verify if an image is being
displayed.
Yes Image present but backlight
is not on. Check logic board
connections. Go to step 5.
No Go to No Video symptom
table.
5. Run Clamshell Service
Diagnostic utility and check
for LCD panel presence. If not
found, reseat and verify that
the display connections to the
logic board are secure. Verify if
image is restored by reseating
loose connections
Yes Issue resolved.
No Continue to test with known-
good display assembly.
Go to step 6.
6. Verify LCD video works with a
known-good display assembly.
Yes Replace display assembly. L03
No Go to No Video symptom
table.
Backlight Issue / No Backlight
Unlikely cause: Power adapter, battery, speaker, optical drive, hard drive, fan microphone, top
case
Quick Check
Symptom Quick Check
Backlight Issue / No Backlight
• Display not illuminated
• Flashing, unstable or non
uniform background lighting
• Poor backlight at some or all
settings
1. Check that brightness setting is above minimum.
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