Lenovo ThinkPad A21e TP A21e, A22e Hardware Maintenance Manual (June 2001) - Page 55
LCD-related symptoms, dots, or a total of 9 or more bright and dark dots.
View all Lenovo ThinkPad A21e manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 55 highlights
LCD-related symptoms Symptom-to-FRU index Important The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). A small number of dots that are missing, discolored, or always lighted is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns. The LCD should be replaced if the number of missing, discolored, or lighted dots in any background is: v SVGA: 5 or more bright dots, 5 or more dark dots, or a total of 9 or more bright and dark dots. v XGA: 8 or more bright dots, 8 or more dark dots, or a total of 9 or more bright and dark dots. Note: Bright dots means pixel is always on (white or color.) Dark dots means pixel is always off (black color.) Symptom or error No beep, power-on indicator on, and a blank LCD during POST. v LCD backlight not working. v LCD too dark. v LCD brightness cannot be adjusted. v LCD contrast cannot be adjusted. v LCD screen unreadable. v Characters missing pixels. v Screen abnormal. v Wrong color displayed. Horizontal or vertical lines displayed on LCD. FRU or action, in sequence System board. 1. Reseat the LCD connectors. 2. LCD assembly. 3. System board. 1. See important note for "LCD-related symptoms". 2. Reseat all LCD connectors. 3. LCD assembly. 4. System board. LCD assembly. ThinkPad A21e, A22e, i 1800 51