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Symptom/Error FRU/Action in Sequence
No beep, power-on
indicator turns on and
LCD is blank.
Power source (battery and
adapter). See “Power
Systems Check” on page 6.
Reconnect the LCD connector
Charger board
CPU board
Hard disk drive
LCD inverter ID
LCD LVDS board (for
14.1–inch LCD)
LCD FPC cable
Inverter
LCD
Planar board
LCD backlight doesn't
work.
LCD is too dark.
LCD brightness
cannot be adjusted.
LCD contrast cannot
be adjusted.
Enter BIOS Utility and
execute "Load Setup Default
Settings"; then reboot the
system.
Reconnect the LCD connec-
tors
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
Planar board
Unreadable LCD
screen.
Missing pels in char-
acters.
Abnormal screen
Wrong color dis-
played.
Reconnect all LCD connec-
tors
LCD inverter ID
LCD FPC cable
LCD inverter
LCD
Planar board
LCD has extra hori-
zontal or vertical lines
displayed.
LCD
LCD FPC cable
LCD inverter ID
Inverter
Planar board
ThinkPad i Series 1400 21