Apple 2009 iMac - Page 48

iMac (21.5-inch, Late 2009) Symptom Charts — Display 48
2010-11-18
Incorrect/Missing Colors
Unlikely cause: power supply, hard drive, optical drive, fans, speakers, camera, microphone
Quick Check
Symptoms Quick Check
Incorrect/Missing Colors
• Wrong color display
• Color/contrast issues
1. Allow display to reach normal operating
temperature for about 15 minutes before
evaluating front-of-screen performance.
2. Verify if System Preferences > Display settings are
congured to use default display prole.
3. Verify System Preferences > Universal Access >
Display “Enhance contrast”, “Use grayscale”, and
“Black on White/White on Black” settings are set
to defaults.
Deep Dive
Check Result Action Code
1. Verify computer has been
warmed up for about 15
minutes to stabilize backlight
before continuing.
Yes Go to step 2.
No Warm up computer for about
15 minutes. Go to step 2.
2. Verify if all four cables on back
of LCD panel are secure at both
ends.
Yes Go to step 3.
No Reseat connections, replace
damaged cable(s) if needed.
Retest.
L14
3. Go to System Preferences >
Desktop & Screen Saver >
Desktop and set color to Solid
Gray Light. Verify if incorrect/
missing color issue aects
entire display.
Yes Suspect poor video
connection. Replace LVDS
cable between LCD panel and
logic board.
L14
No Go to step 4.
4. Set up computer side-by-side
with a known-good, same-
model computer showing
same image. Verify if issue is
noticeably worse on display
being tested.
Yes Replace LCD panel. L02
No Small variations in color
uniformity across display are
normal and do not warrant
replacement of LCD.