Apple MD094LL/A Manual De Usuario
iMac (27-inch, Mid 2010) Symptom Charts — Display
58
2010-09-09
LCD Image Issues
Unlikely cause: power supply, hard drive, optical drive, fans, speakers, camera, microphone
Quick Check
Symptom
Quick Check
LCD Issues
• Incorrect/missing colors
• Distorted/blurred image
• Pixel anomalies
• Vertical/horizontal lines
• Non-uniform brightness
• Flickering
• Incorrect/missing colors
• Distorted/blurred image
• Pixel anomalies
• Vertical/horizontal lines
• Non-uniform brightness
• Flickering
1. If display flicker only occurs when the brightness
level is set below maximum, then jump to topic,
2. Run Automatic Software Update to verify that all
available firmware and software updates have
been applied.
3. Verify Mac OS X version installed is the build
version supported on the hardware. Make sure
customer didn’t migrate over old version of Mac
OS X.
4. Allow display to reach normal operating
temperature for about 15 minutes before
evaluating front-of-screen performance.
5. Check display preferences for use of custom
display profile.
6. Check brightness setting.
7. Clean glass panel while checking for dust/debris.
7. Clean glass panel while checking for dust/debris.
Deep Dive:
Check
Result
Action
Code
1. Verify if user issue is due to
flickering, or to an unstable
video image on the LCD.
Yes
Flickering issue, go to
Symptom table
.
No
Go to step 2.
2. Verify if issue is incorrect/
missing colors.
Yes
Go to
No
Go to step 3.
3. Verify if issue is distorted/
blurred image.
Yes
Go to
No
Go to step 4.