Apple Macbook Pro Aluminum 13-Inch Black Laptop Keyb Technical Guide - Page 74

Blank / No Video, Symptom, Quick Check, Check, Result, Action

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2010-06-15 Blank / No Video Unlikely cause: power adapter, speakers, optical drive, hard drive, fan, microphone, top case, Quick Check Symptom Blank / No Video • No video • No backlight Quick Check 1. Check brightness setting 2. Attach known-good supported external display. 3. Boot from Mac OS X install DVD that came with computer. Deep Dive Check 1. Verify boot chime present when system restarted. Reset SMC and clear PRAM if necessary for proper start up. Is LCD video present? 2. Connect known-good supported external display. Verify whether image appears on external display when system is booted. 3. Verify if LCD backlight is on by looking for faint glow from display when viewed in darkened room with brightness adjusted to full. 4. Shine bright (low heat) flashlight into the front of LCD. Verify if Apple logo on the back of display glows. Result Yes No Yes No Yes No Yes No 5. Run Clamshell Service Yes Diagnostic utility and check for LCD panel presence. If No not found, reseat and verify that the display connection to the logic board is secure. Verify if image is restored after reseating loose connector. Action Go to step 3. Go to step 2. Code External display detected by system. Go to step 3. Go to No Video symptom code flow. Video signal from system to external video is OK, LCD backlight is on. Go to step 5. Go to step 4. Image present but backlight is not on. Check logic board connections. Go to step 5. Go to No Video symptom code flow. Issue resolved. Continue to test with knowngood display assembly. Go to step 6. MacBook (13-inch, Aluminum, Late 2008) Symptom Charts - Display 74

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MacBook (13-inch, Aluminum, Late 2008) Symptom Charts — Display
74
2010-06-15
Blank / No Video
Unlikely cause:
power adapter, speakers, optical drive, hard drive, fan, microphone, top case,
Quick Check
Symptom
Quick Check
Blank / No Video
•
No video
•
No backlight
1.
Check brightness setting
2.
Attach known-good supported external display.
3.
Boot from Mac OS X install DVD that came with
computer.
Deep Dive
Check
Result
Action
Code
1.
Verify boot chime present
when system restarted.
Reset SMC and clear PRAM if
necessary for proper start up.
Is LCD video present?
Yes
Go to step 3.
No
Go to step 2.
2.
Connect known-good
supported external display.
Verify whether image appears
on external display when
system is booted.
Yes
External display detected by
system.
Go to step 3.
No
Go to No Video symptom
code flow.
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)
flashlight into the front of LCD.
Verify if Apple logo on the
back of display glows.
Yes
Image present but backlight
is not on. Check logic board
connections.
Go to step 5.
No
Go to No Video symptom
code flow.
5.
Run Clamshell Service
Diagnostic utility and check
for
LCD panel presence. If
not found, reseat and verify
that the display connection
to the logic board is secure.
Verify if image is restored after
reseating loose connector.
Yes
Issue resolved.
No
Continue to test with known-
good display assembly.
Go to
step 6.