Note: For products introduced in 2010 and later refer to About LCD display pixel anomalies for Apple products released in 2010 and later.

Note: For products introduced in 2010 and later refer to About LCD display pixel anomalies for Apple products released in 2010 and later. Many Apple products use active-matrix LCD panels, including the iMac (Flat Panel), MacBook Pro, MacBook, iBook, PowerBook, Apple Cinema displays, and iPod models with a color display. To check for dead pixels just press F11 and use your keyboard arrows or mouse wheel to scroll down and change the colors. Dead Pixel Test. Stuck pixels are most noticeable when the rest of the screen is black. Stuck pixels are different from dead pixels. A stuck pixel is a single color – red, green, or blue – all of the time. A dead pixel is black instead. While it’s often possible to “unstick” a stuck pixel, it’s much less likely that a dead pixel will be fixed. A dead pixel is a defective pixel in which all subpixels are off, therefore appearing black in color, it can be clearly seen against a white background. – Photo taken from Instructables. Note: Make sure you have turned off your screensaver when running the program, because the screensaver can interrupt the process.

Many Apple products use active-matrix LCD panels, including the iMac (Flat Panel), MacBook Pro, MacBook, iBook, PowerBook, Apple Cinema displays, and iPod models with a color display. In addition to being slim and light, active-matrix LCD technology provides customers with many visual performance advantages when compared to traditional cathode-ray tube- (CRT) based displays, such as increased brightness, sharpness, and contrast ratio.

Test For Dead Pixels Macular

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.

If you suspect your display contains a high number of pixel anomalies, take your Apple product to an Apple Authorized Service Provider for closer examination. There may be a charge for the evaluation.

“Dead” pixels—defective pixels on a liquid crystal display (LCD) that are not performing as expected. Variations of dead pixels: dark dot, bright dot and partial sub-pixel defects.

Test For Dead Pixels Macbook

Below you may see examples of dead-pixels:

Clean the screen gently with a soft cloth and click “Start test”. Press “F11” key if your browser window doesn't switch to full screen automatically. Press “Esc” key to exit fullscreen mode and to stop test and return to this page. Click left mouse button or press “space” to change test-screen.

Pixels are very small so you have to look carefully all test screens. Let your eyes accommodate to screen brightness.

Start Testing For Dead Pixels