IBM 2621421 Hardware Maintenance Manual - Page 134

LCD FRU Replacement Notice The TFT LCD for the notebook computer contains over 2,359,296 thin-film transistors (TFTs). A small number of missing, discolored, or lighted dots (on all the time) 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: SVGA (12.1"): 5 or more bright dots, 5 or more dark dots, or a total of 9 or more bright and dark dots XGA (14.1"): 8 or more bright dots, 8 or more dark dots, or a total of 9 or more bright and dark dots Symptom/Error No beep, power-on indicator turns on and LCD is blank. LCD backlight doesn't work. LCD is too dark. LCD brightness cannot be adjusted. LCD contrast cannot be adjusted. FRU/Action in Sequence Power source (battery and adapter). See "Power Systems Check" on page 111. Reconnect the LCD connector DC/DC charger Hard disk drive LCD inverter ID LCD LVDS board (for 14.1-inch LCD) LCD FPC cable Inverter LCD System board Enter BIOS Utility and execute "Load Setup Default Settings"; then reboot the system. Reconnect the LCD connectors Keyboard (if contrast and brightness function keys do not work) LCD inverter ID LCD LVDS board (for 14.1-inch LCD) LCD FPC cable LCD inverter LCD System board 126 ThinkPad i Series 1400 HMM