Apple MD094LL/A manual LCD Image Issues

LCD Image Issues

Unlikely cause: power supply, hard drive, optical drive, fans, speakers, camera, microphone

Quick Check

Symptom		Quick Check
LCD Issues		1.	If display flicker only occurs when the brightness
•	Incorrect/missing colors		level is set below maximum, then jump to topic,
•	Distorted/blurred image		“Display: Backlight Issue / No Backlight.”
•	Pixel anomalies	2.	Run Automatic Software Update to verify that all
•	Vertical/horizontal lines		available firmware and software updates have
• Non-uniform brightness			been applied.
•	Flickering	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.

Deep Dive:

Check		Result	Action	Code
1.	Verify if user issue is due to	Yes	Flickering issue, go to Noise
	flickering, or to an unstable		/ Unstable Flickering
	video image on the LCD.		Symptom table.
		No	Go to step 2.
2.	Verify if issue is incorrect/	Yes	Go to incorrect/missing
	missing colors.		colors.
		No	Go to step 3.
3.	Verify if issue is distorted/	Yes	Go to distorted/blurred
	blurred image.		image.
		No	Go to step 4.

2010-09-09 iMac (27-inch, Mid 2010) Symptom Charts — Display  58