Apple Macbook Pro Aluminum 13-Inch Black Laptop Keyb Technical Guide - Page 75

Backlight Issue / No Backlight, Quick Check, Symptom, Check, Result, Action

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6. Verify LCD video works with a Yes Replace display assembly. L03 known-good display assembly. No Go to No Video symptom code flow. Backlight Issue / No Backlight Unlikely cause: power adapter, battery, speakers, optical drive, hard drive, fan, microphone, top case, Quick Check Symptom Backlight Issue / No Backlight • Display not illuminated • Flashing, unstable, or non- uniform backlight • Poor backlight at some or all settings Quick Check Check that brightness setting is above minimum. Deep Dive Check Result 1. Connect external display, clear Yes PRAM to set brightness to default level and verify if Color LCD is listed in the System No Profiler's Graphics/Displays device tree. 2. Unplug and reseat the LVDS Yes cable at the logic board. Repeat verification in System Profiler. No 3. Darken room and verify Yes backlight by detecting if any glow is emitted from the Apple logo on the back of display No Action Display panel detected by system. Go to step 3. Go to step 2. Display panel detected by system. Go to step 3. Go to step 4. Backlight operating. Go to step 5. Go to step 4. Code 2010-06-15 MacBook (13-inch, Aluminum, Late 2008) Symptom Charts - Display 75

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MacBook (13-inch, Aluminum, Late 2008) Symptom Charts — Display
75
2010-06-15
6.
Verify LCD video works with a
known-good display assembly.
Yes
Replace display assembly.
L03
No
Go to No Video symptom
code flow.
Backlight Issue / No Backlight
Unlikely cause:
power adapter, battery, speakers, 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 backlight
•
Poor backlight at some or all
settings
Check that brightness setting is above minimum.
Deep Dive
Check
Result
Action
Code
1.
Connect external display, clear
PRAM to set brightness to
default level and verify if Color
LCD is listed in the System
Profiler’s Graphics/Displays
device tree.
Yes
Display panel detected by
system. Go to step 3.
No
Go to step 2.
2.
Unplug and reseat the LVDS
cable at the logic board.
Repeat verification in System
Profiler.
Yes
Display panel detected by
system. Go to step 3.
No
Go to step 4.
3.
Darken room and verify
backlight by detecting if any
glow is emitted from the Apple
logo on the back of display
Yes
Backlight operating. Go to
step 5.
No
Go to step 4.