 Apple Technician Guide - tim.id.au

2010-08-05
Deep Dive: Incorrect/Missing Colors
Check Result Action Code
1. Verify display is listed in the
System Profiler’s Graphics/
Displays device tree.
2. Verify System Preferences
Display Profile is valid for
display being tested. Color
profile should be set to Color
LCD, user may have created an
off-color calibration setting.
3. Verify that the glass panel is
free of contaminants.
4. Run Clamshell Service
Diagnostic utility and check
for LCD panel presence. If not
found, reseat and verify LVDS
cable is secure to the logic
board. Are colors restored?
5. Set desktop pattern in System
Preferences to ‘Solid Gray Light’.
Verify if incorrect/missing color
issue affects entire display.
6. Set up display under test side
by side with another known
good display showing the
same image. Verify if issue
is noticeably worse on the
display being tested.
7. Substitute a known-good
display assembly to test logic
board video output. Is normal
video restored?
Yes This ensures color profile can
be matched with LCD. Go to
step 2.
No Go to N09.
Yes If display profile is valid and
the colors are still incorrect or
missing go to step 3.
No Set System Preferences:
Displays: Color to Color LCD
and retest.
Yes Go to step 4.
No Clean glass panel using
approved method. Retest.
Yes Loose cable connection. Issue
resolved.
No Go to step 5.
Yes Test a known-good display, go
to step 7.
No Go to step 6.
Yes Test a known-good display, go
to step 7
No Small variations in color
uniformity are normal and do
not warrant replacement or
repair of the display.
L02
Yes Replace display assembly. L02
No Replace logic board. M04
MacBook Pro (15-inch, 2.53 GHz, Mid 2009) Symptom Charts — Display 72