Apple 24-inch mid 2007 manual Display Panel, Display does not change but the mouse still moves

Display Panel

Black and white splotches on the LCD panel after it runs for awhile

Check the hard drive. The hard drive should be mounted with the circuit board facing up or out towards the LCD as shown in the hard drive chapter. It’s possible to mount the hard drive upside down (hard drive top cover facing LCD) which generates a corrupted image (black and white splotches) on the LCD panel after it runs a while.

Display does not change but the mouse still moves

Make sure all software updates have been applied to the computer. Refer to KBase article 303903, Intel-based iMac: Installing available updates , and to Apple Downloads for all available updates for the iMac (Mid 2007) model of computers

When displaying a single color over the screen area, the LCD panel shows one or more pixels that are not properly lit.

Active-matrix LCD technology uses rows and columns of addressable locations (pixels) that render text and images on screen. Each pixel location has three separate subpixels (red, green, and blue) that allow the image to be rendered in full color. Each subpixel has a corresponding transistor responsible for turning the subpixel on or off.

There are typically millions of these subpixels on an LCD display. For example, the LCD panel used in the Apple Cinema HD display is made up of 2.3 million pixels and 6.9 million red, green, and blue subpixels. Occasionally, a transistor does not work perfectly, which may result in the affected subpixel being turned on (bright) or turned off (dark). With the millions of subpixels on a display, it is quite possible to have a low number of faulty transistors on an LCD. Therefore, a certain number of subpixel anomalies is considered acceptable. Rejecting all but perfect LCD panels would significantly increase the retail price for products using LCD displays. These factors apply to all manufacturers using LCD technology—not just Apple products.

To determine whether or not the display has an acceptable number of pixel anomalies, follow the steps below:

1.Set the display image to one of the following colors: all-white display, all-red display, all-green display, or all-blue display.

2.Using a jeweler’s loupe, pocket microscope, or other magnifying device, identify and count each subpixel anomaly:

•Bright subpixel anomaly = subpixel that is always on

•Dark subpixel anomaly = subpixel that is always off

3.Important: Check the number of subpixel anomalies with the following chart:

LCD Size	Acceptable Number of Subpixel			Replace the Display
(inches)	Anomalies
	Bright	Dark	Both	Bright	Dark	Both

iMac (24-inch Mid 2007) Take Apart — Symptom Charts  217