Apple MacBook Pro 17-inch (original, Core 2 Duo, 2.4GHz, Late 2007 CTO, Early 2008, and Late 2008) - Manual (Page 178)

MacBook Pro 17-inch (original, Core 2 Duo, 2.4/2.6GHz, 2008) Troubleshooting — Hardware Symptom Charts 178
If the number of subpixel anomalies exceeds the acceptable number listed in the above 3.
chart, replace the display panel assembly.
Replace
Bright 4 or more
Dark 6 or more
Combination 8 or more
If the number of subpixel anomalies is acceptable, explain to the customer that the pixel 4.
anomalies are within specifications, and no repair is necessary.
Important: Do not release the specifications to customers. Instead, inform them that a certain
number of subpixel anomalies are considered acceptable, and these factors apply to all
manufacturers using LCD technology—not just Apple products.
When speaking with customers, please use the following explanation:
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 are 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.
ExpressCard/34
ExpressCard will not insert into the ExpressCard slot
Make sure the ExpressCard is 34mm in width. The general ExpressCard standard does allow 1.
for 54mm cards which will not fit in this slot.
Make sure the ExpressCard is oriented right side up (cards are keyed and cannot be inserted 2.
upside down).
Verify that the ExpressCard is not warped or damaged in any way; if so, replace the card. 3.
Try a different ExpressCard. 4.
Carefully raise the ExpressCard slot cover and check for a foreign object inside the slot. 5.
If the slot cover is preventing the card from being inserted, the door may be catching on the 6.
top of the ExpressCard mechanism. Adjust the position of ExpressCard cage on the left I/O